| 1 | // Algorithm implementation -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2001-2022 Free Software Foundation, Inc. |
| 4 | // |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
| 6 | // software; you can redistribute it and/or modify it under the |
| 7 | // terms of the GNU General Public License as published by the |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 9 | // any later version. |
| 10 | |
| 11 | // This library is distributed in the hope that it will be useful, |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | // GNU General Public License for more details. |
| 15 | |
| 16 | // Under Section 7 of GPL version 3, you are granted additional |
| 17 | // permissions described in the GCC Runtime Library Exception, version |
| 18 | // 3.1, as published by the Free Software Foundation. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License and |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 | // <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | /* |
| 26 | * |
| 27 | * Copyright (c) 1994 |
| 28 | * Hewlett-Packard Company |
| 29 | * |
| 30 | * Permission to use, copy, modify, distribute and sell this software |
| 31 | * and its documentation for any purpose is hereby granted without fee, |
| 32 | * provided that the above copyright notice appear in all copies and |
| 33 | * that both that copyright notice and this permission notice appear |
| 34 | * in supporting documentation. Hewlett-Packard Company makes no |
| 35 | * representations about the suitability of this software for any |
| 36 | * purpose. It is provided "as is" without express or implied warranty. |
| 37 | * |
| 38 | * |
| 39 | * Copyright (c) 1996 |
| 40 | * Silicon Graphics Computer Systems, Inc. |
| 41 | * |
| 42 | * Permission to use, copy, modify, distribute and sell this software |
| 43 | * and its documentation for any purpose is hereby granted without fee, |
| 44 | * provided that the above copyright notice appear in all copies and |
| 45 | * that both that copyright notice and this permission notice appear |
| 46 | * in supporting documentation. Silicon Graphics makes no |
| 47 | * representations about the suitability of this software for any |
| 48 | * purpose. It is provided "as is" without express or implied warranty. |
| 49 | */ |
| 50 | |
| 51 | /** @file bits/stl_algo.h |
| 52 | * This is an internal header file, included by other library headers. |
| 53 | * Do not attempt to use it directly. @headername{algorithm} |
| 54 | */ |
| 55 | |
| 56 | #ifndef _STL_ALGO_H |
| 57 | #define _STL_ALGO_H 1 |
| 58 | |
| 59 | #include <bits/algorithmfwd.h> |
| 60 | #include <bits/stl_heap.h> |
| 61 | #include <bits/stl_tempbuf.h> // for _Temporary_buffer |
| 62 | #include <bits/predefined_ops.h> |
| 63 | |
| 64 | #if __cplusplus >= 201103L |
| 65 | #include <bits/uniform_int_dist.h> |
| 66 | #endif |
| 67 | |
| 68 | #if _GLIBCXX_HOSTED && (__cplusplus <= 201103L || _GLIBCXX_USE_DEPRECATED) |
| 69 | #include <cstdlib> // for rand |
| 70 | #endif |
| 71 | |
| 72 | // See concept_check.h for the __glibcxx_*_requires macros. |
| 73 | |
| 74 | namespace std _GLIBCXX_VISIBILITY(default) |
| 75 | { |
| 76 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 77 | |
| 78 | /// Swaps the median value of *__a, *__b and *__c under __comp to *__result |
| 79 | template<typename _Iterator, typename _Compare> |
| 80 | _GLIBCXX20_CONSTEXPR |
| 81 | void |
| 82 | __move_median_to_first(_Iterator __result,_Iterator __a, _Iterator __b, |
| 83 | _Iterator __c, _Compare __comp) |
| 84 | { |
| 85 | if (__comp(__a, __b)) |
| 86 | { |
| 87 | if (__comp(__b, __c)) |
| 88 | std::iter_swap(__result, __b); |
| 89 | else if (__comp(__a, __c)) |
| 90 | std::iter_swap(__result, __c); |
| 91 | else |
| 92 | std::iter_swap(__result, __a); |
| 93 | } |
| 94 | else if (__comp(__a, __c)) |
| 95 | std::iter_swap(__result, __a); |
| 96 | else if (__comp(__b, __c)) |
| 97 | std::iter_swap(__result, __c); |
| 98 | else |
| 99 | std::iter_swap(__result, __b); |
| 100 | } |
| 101 | |
| 102 | /// Provided for stable_partition to use. |
| 103 | template<typename _InputIterator, typename _Predicate> |
| 104 | _GLIBCXX20_CONSTEXPR |
| 105 | inline _InputIterator |
| 106 | __find_if_not(_InputIterator __first, _InputIterator __last, |
| 107 | _Predicate __pred) |
| 108 | { |
| 109 | return std::__find_if(__first, __last, |
| 110 | __gnu_cxx::__ops::__negate(__pred), |
| 111 | std::__iterator_category(__first)); |
| 112 | } |
| 113 | |
| 114 | /// Like find_if_not(), but uses and updates a count of the |
| 115 | /// remaining range length instead of comparing against an end |
| 116 | /// iterator. |
| 117 | template<typename _InputIterator, typename _Predicate, typename _Distance> |
| 118 | _GLIBCXX20_CONSTEXPR |
| 119 | _InputIterator |
| 120 | __find_if_not_n(_InputIterator __first, _Distance& __len, _Predicate __pred) |
| 121 | { |
| 122 | for (; __len; --__len, (void) ++__first) |
| 123 | if (!__pred(__first)) |
| 124 | break; |
| 125 | return __first; |
| 126 | } |
| 127 | |
| 128 | // set_difference |
| 129 | // set_intersection |
| 130 | // set_symmetric_difference |
| 131 | // set_union |
| 132 | // for_each |
| 133 | // find |
| 134 | // find_if |
| 135 | // find_first_of |
| 136 | // adjacent_find |
| 137 | // count |
| 138 | // count_if |
| 139 | // search |
| 140 | |
| 141 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 142 | typename _BinaryPredicate> |
| 143 | _GLIBCXX20_CONSTEXPR |
| 144 | _ForwardIterator1 |
| 145 | __search(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 146 | _ForwardIterator2 __first2, _ForwardIterator2 __last2, |
| 147 | _BinaryPredicate __predicate) |
| 148 | { |
| 149 | // Test for empty ranges |
| 150 | if (__first1 == __last1 || __first2 == __last2) |
| 151 | return __first1; |
| 152 | |
| 153 | // Test for a pattern of length 1. |
| 154 | _ForwardIterator2 __p1(__first2); |
| 155 | if (++__p1 == __last2) |
| 156 | return std::__find_if(__first1, __last1, |
| 157 | __gnu_cxx::__ops::__iter_comp_iter(__predicate, __first2)); |
| 158 | |
| 159 | // General case. |
| 160 | _ForwardIterator1 __current = __first1; |
| 161 | |
| 162 | for (;;) |
| 163 | { |
| 164 | __first1 = |
| 165 | std::__find_if(__first1, __last1, |
| 166 | __gnu_cxx::__ops::__iter_comp_iter(__predicate, __first2)); |
| 167 | |
| 168 | if (__first1 == __last1) |
| 169 | return __last1; |
| 170 | |
| 171 | _ForwardIterator2 __p = __p1; |
| 172 | __current = __first1; |
| 173 | if (++__current == __last1) |
| 174 | return __last1; |
| 175 | |
| 176 | while (__predicate(__current, __p)) |
| 177 | { |
| 178 | if (++__p == __last2) |
| 179 | return __first1; |
| 180 | if (++__current == __last1) |
| 181 | return __last1; |
| 182 | } |
| 183 | ++__first1; |
| 184 | } |
| 185 | return __first1; |
| 186 | } |
| 187 | |
| 188 | // search_n |
| 189 | |
| 190 | /** |
| 191 | * This is an helper function for search_n overloaded for forward iterators. |
| 192 | */ |
| 193 | template<typename _ForwardIterator, typename _Integer, |
| 194 | typename _UnaryPredicate> |
| 195 | _GLIBCXX20_CONSTEXPR |
| 196 | _ForwardIterator |
| 197 | __search_n_aux(_ForwardIterator __first, _ForwardIterator __last, |
| 198 | _Integer __count, _UnaryPredicate __unary_pred, |
| 199 | std::forward_iterator_tag) |
| 200 | { |
| 201 | __first = std::__find_if(__first, __last, __unary_pred); |
| 202 | while (__first != __last) |
| 203 | { |
| 204 | typename iterator_traits<_ForwardIterator>::difference_type |
| 205 | __n = __count; |
| 206 | _ForwardIterator __i = __first; |
| 207 | ++__i; |
| 208 | while (__i != __last && __n != 1 && __unary_pred(__i)) |
| 209 | { |
| 210 | ++__i; |
| 211 | --__n; |
| 212 | } |
| 213 | if (__n == 1) |
| 214 | return __first; |
| 215 | if (__i == __last) |
| 216 | return __last; |
| 217 | __first = std::__find_if(++__i, __last, __unary_pred); |
| 218 | } |
| 219 | return __last; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * This is an helper function for search_n overloaded for random access |
| 224 | * iterators. |
| 225 | */ |
| 226 | template<typename _RandomAccessIter, typename _Integer, |
| 227 | typename _UnaryPredicate> |
| 228 | _GLIBCXX20_CONSTEXPR |
| 229 | _RandomAccessIter |
| 230 | __search_n_aux(_RandomAccessIter __first, _RandomAccessIter __last, |
| 231 | _Integer __count, _UnaryPredicate __unary_pred, |
| 232 | std::random_access_iterator_tag) |
| 233 | { |
| 234 | typedef typename std::iterator_traits<_RandomAccessIter>::difference_type |
| 235 | _DistanceType; |
| 236 | |
| 237 | _DistanceType __tailSize = __last - __first; |
| 238 | _DistanceType __remainder = __count; |
| 239 | |
| 240 | while (__remainder <= __tailSize) // the main loop... |
| 241 | { |
| 242 | __first += __remainder; |
| 243 | __tailSize -= __remainder; |
| 244 | // __first here is always pointing to one past the last element of |
| 245 | // next possible match. |
| 246 | _RandomAccessIter __backTrack = __first; |
| 247 | while (__unary_pred(--__backTrack)) |
| 248 | { |
| 249 | if (--__remainder == 0) |
| 250 | return (__first - __count); // Success |
| 251 | } |
| 252 | __remainder = __count + 1 - (__first - __backTrack); |
| 253 | } |
| 254 | return __last; // Failure |
| 255 | } |
| 256 | |
| 257 | template<typename _ForwardIterator, typename _Integer, |
| 258 | typename _UnaryPredicate> |
| 259 | _GLIBCXX20_CONSTEXPR |
| 260 | _ForwardIterator |
| 261 | __search_n(_ForwardIterator __first, _ForwardIterator __last, |
| 262 | _Integer __count, |
| 263 | _UnaryPredicate __unary_pred) |
| 264 | { |
| 265 | if (__count <= 0) |
| 266 | return __first; |
| 267 | |
| 268 | if (__count == 1) |
| 269 | return std::__find_if(__first, __last, __unary_pred); |
| 270 | |
| 271 | return std::__search_n_aux(__first, __last, __count, __unary_pred, |
| 272 | std::__iterator_category(__first)); |
| 273 | } |
| 274 | |
| 275 | // find_end for forward iterators. |
| 276 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 277 | typename _BinaryPredicate> |
| 278 | _GLIBCXX20_CONSTEXPR |
| 279 | _ForwardIterator1 |
| 280 | __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 281 | _ForwardIterator2 __first2, _ForwardIterator2 __last2, |
| 282 | forward_iterator_tag, forward_iterator_tag, |
| 283 | _BinaryPredicate __comp) |
| 284 | { |
| 285 | if (__first2 == __last2) |
| 286 | return __last1; |
| 287 | |
| 288 | _ForwardIterator1 __result = __last1; |
| 289 | while (1) |
| 290 | { |
| 291 | _ForwardIterator1 __new_result |
| 292 | = std::__search(__first1, __last1, __first2, __last2, __comp); |
| 293 | if (__new_result == __last1) |
| 294 | return __result; |
| 295 | else |
| 296 | { |
| 297 | __result = __new_result; |
| 298 | __first1 = __new_result; |
| 299 | ++__first1; |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | // find_end for bidirectional iterators (much faster). |
| 305 | template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, |
| 306 | typename _BinaryPredicate> |
| 307 | _GLIBCXX20_CONSTEXPR |
| 308 | _BidirectionalIterator1 |
| 309 | __find_end(_BidirectionalIterator1 __first1, |
| 310 | _BidirectionalIterator1 __last1, |
| 311 | _BidirectionalIterator2 __first2, |
| 312 | _BidirectionalIterator2 __last2, |
| 313 | bidirectional_iterator_tag, bidirectional_iterator_tag, |
| 314 | _BinaryPredicate __comp) |
| 315 | { |
| 316 | // concept requirements |
| 317 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 318 | _BidirectionalIterator1>) |
| 319 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 320 | _BidirectionalIterator2>) |
| 321 | |
| 322 | typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1; |
| 323 | typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2; |
| 324 | |
| 325 | _RevIterator1 __rlast1(__first1); |
| 326 | _RevIterator2 __rlast2(__first2); |
| 327 | _RevIterator1 __rresult = std::__search(_RevIterator1(__last1), __rlast1, |
| 328 | _RevIterator2(__last2), __rlast2, |
| 329 | __comp); |
| 330 | |
| 331 | if (__rresult == __rlast1) |
| 332 | return __last1; |
| 333 | else |
| 334 | { |
| 335 | _BidirectionalIterator1 __result = __rresult.base(); |
| 336 | std::advance(__result, -std::distance(__first2, __last2)); |
| 337 | return __result; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * @brief Find last matching subsequence in a sequence. |
| 343 | * @ingroup non_mutating_algorithms |
| 344 | * @param __first1 Start of range to search. |
| 345 | * @param __last1 End of range to search. |
| 346 | * @param __first2 Start of sequence to match. |
| 347 | * @param __last2 End of sequence to match. |
| 348 | * @return The last iterator @c i in the range |
| 349 | * @p [__first1,__last1-(__last2-__first2)) such that @c *(i+N) == |
| 350 | * @p *(__first2+N) for each @c N in the range @p |
| 351 | * [0,__last2-__first2), or @p __last1 if no such iterator exists. |
| 352 | * |
| 353 | * Searches the range @p [__first1,__last1) for a sub-sequence that |
| 354 | * compares equal value-by-value with the sequence given by @p |
| 355 | * [__first2,__last2) and returns an iterator to the __first |
| 356 | * element of the sub-sequence, or @p __last1 if the sub-sequence |
| 357 | * is not found. The sub-sequence will be the last such |
| 358 | * subsequence contained in [__first1,__last1). |
| 359 | * |
| 360 | * Because the sub-sequence must lie completely within the range @p |
| 361 | * [__first1,__last1) it must start at a position less than @p |
| 362 | * __last1-(__last2-__first2) where @p __last2-__first2 is the |
| 363 | * length of the sub-sequence. This means that the returned |
| 364 | * iterator @c i will be in the range @p |
| 365 | * [__first1,__last1-(__last2-__first2)) |
| 366 | */ |
| 367 | template<typename _ForwardIterator1, typename _ForwardIterator2> |
| 368 | _GLIBCXX20_CONSTEXPR |
| 369 | inline _ForwardIterator1 |
| 370 | find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 371 | _ForwardIterator2 __first2, _ForwardIterator2 __last2) |
| 372 | { |
| 373 | // concept requirements |
| 374 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) |
| 375 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) |
| 376 | __glibcxx_function_requires(_EqualOpConcept< |
| 377 | typename iterator_traits<_ForwardIterator1>::value_type, |
| 378 | typename iterator_traits<_ForwardIterator2>::value_type>) |
| 379 | __glibcxx_requires_valid_range(__first1, __last1); |
| 380 | __glibcxx_requires_valid_range(__first2, __last2); |
| 381 | |
| 382 | return std::__find_end(__first1, __last1, __first2, __last2, |
| 383 | std::__iterator_category(__first1), |
| 384 | std::__iterator_category(__first2), |
| 385 | __gnu_cxx::__ops::__iter_equal_to_iter()); |
| 386 | } |
| 387 | |
| 388 | /** |
| 389 | * @brief Find last matching subsequence in a sequence using a predicate. |
| 390 | * @ingroup non_mutating_algorithms |
| 391 | * @param __first1 Start of range to search. |
| 392 | * @param __last1 End of range to search. |
| 393 | * @param __first2 Start of sequence to match. |
| 394 | * @param __last2 End of sequence to match. |
| 395 | * @param __comp The predicate to use. |
| 396 | * @return The last iterator @c i in the range @p |
| 397 | * [__first1,__last1-(__last2-__first2)) such that @c |
| 398 | * predicate(*(i+N), @p (__first2+N)) is true for each @c N in the |
| 399 | * range @p [0,__last2-__first2), or @p __last1 if no such iterator |
| 400 | * exists. |
| 401 | * |
| 402 | * Searches the range @p [__first1,__last1) for a sub-sequence that |
| 403 | * compares equal value-by-value with the sequence given by @p |
| 404 | * [__first2,__last2) using comp as a predicate and returns an |
| 405 | * iterator to the first element of the sub-sequence, or @p __last1 |
| 406 | * if the sub-sequence is not found. The sub-sequence will be the |
| 407 | * last such subsequence contained in [__first,__last1). |
| 408 | * |
| 409 | * Because the sub-sequence must lie completely within the range @p |
| 410 | * [__first1,__last1) it must start at a position less than @p |
| 411 | * __last1-(__last2-__first2) where @p __last2-__first2 is the |
| 412 | * length of the sub-sequence. This means that the returned |
| 413 | * iterator @c i will be in the range @p |
| 414 | * [__first1,__last1-(__last2-__first2)) |
| 415 | */ |
| 416 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 417 | typename _BinaryPredicate> |
| 418 | _GLIBCXX20_CONSTEXPR |
| 419 | inline _ForwardIterator1 |
| 420 | find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 421 | _ForwardIterator2 __first2, _ForwardIterator2 __last2, |
| 422 | _BinaryPredicate __comp) |
| 423 | { |
| 424 | // concept requirements |
| 425 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) |
| 426 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) |
| 427 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 428 | typename iterator_traits<_ForwardIterator1>::value_type, |
| 429 | typename iterator_traits<_ForwardIterator2>::value_type>) |
| 430 | __glibcxx_requires_valid_range(__first1, __last1); |
| 431 | __glibcxx_requires_valid_range(__first2, __last2); |
| 432 | |
| 433 | return std::__find_end(__first1, __last1, __first2, __last2, |
| 434 | std::__iterator_category(__first1), |
| 435 | std::__iterator_category(__first2), |
| 436 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 437 | } |
| 438 | |
| 439 | #if __cplusplus >= 201103L |
| 440 | /** |
| 441 | * @brief Checks that a predicate is true for all the elements |
| 442 | * of a sequence. |
| 443 | * @ingroup non_mutating_algorithms |
| 444 | * @param __first An input iterator. |
| 445 | * @param __last An input iterator. |
| 446 | * @param __pred A predicate. |
| 447 | * @return True if the check is true, false otherwise. |
| 448 | * |
| 449 | * Returns true if @p __pred is true for each element in the range |
| 450 | * @p [__first,__last), and false otherwise. |
| 451 | */ |
| 452 | template<typename _InputIterator, typename _Predicate> |
| 453 | _GLIBCXX20_CONSTEXPR |
| 454 | inline bool |
| 455 | all_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) |
| 456 | { return __last == std::find_if_not(__first, __last, __pred); } |
| 457 | |
| 458 | /** |
| 459 | * @brief Checks that a predicate is false for all the elements |
| 460 | * of a sequence. |
| 461 | * @ingroup non_mutating_algorithms |
| 462 | * @param __first An input iterator. |
| 463 | * @param __last An input iterator. |
| 464 | * @param __pred A predicate. |
| 465 | * @return True if the check is true, false otherwise. |
| 466 | * |
| 467 | * Returns true if @p __pred is false for each element in the range |
| 468 | * @p [__first,__last), and false otherwise. |
| 469 | */ |
| 470 | template<typename _InputIterator, typename _Predicate> |
| 471 | _GLIBCXX20_CONSTEXPR |
| 472 | inline bool |
| 473 | none_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) |
| 474 | { return __last == _GLIBCXX_STD_A::find_if(__first, __last, __pred); } |
| 475 | |
| 476 | /** |
| 477 | * @brief Checks that a predicate is true for at least one element |
| 478 | * of a sequence. |
| 479 | * @ingroup non_mutating_algorithms |
| 480 | * @param __first An input iterator. |
| 481 | * @param __last An input iterator. |
| 482 | * @param __pred A predicate. |
| 483 | * @return True if the check is true, false otherwise. |
| 484 | * |
| 485 | * Returns true if an element exists in the range @p |
| 486 | * [__first,__last) such that @p __pred is true, and false |
| 487 | * otherwise. |
| 488 | */ |
| 489 | template<typename _InputIterator, typename _Predicate> |
| 490 | _GLIBCXX20_CONSTEXPR |
| 491 | inline bool |
| 492 | any_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) |
| 493 | { return !std::none_of(__first, __last, __pred); } |
| 494 | |
| 495 | /** |
| 496 | * @brief Find the first element in a sequence for which a |
| 497 | * predicate is false. |
| 498 | * @ingroup non_mutating_algorithms |
| 499 | * @param __first An input iterator. |
| 500 | * @param __last An input iterator. |
| 501 | * @param __pred A predicate. |
| 502 | * @return The first iterator @c i in the range @p [__first,__last) |
| 503 | * such that @p __pred(*i) is false, or @p __last if no such iterator exists. |
| 504 | */ |
| 505 | template<typename _InputIterator, typename _Predicate> |
| 506 | _GLIBCXX20_CONSTEXPR |
| 507 | inline _InputIterator |
| 508 | find_if_not(_InputIterator __first, _InputIterator __last, |
| 509 | _Predicate __pred) |
| 510 | { |
| 511 | // concept requirements |
| 512 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 513 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 514 | typename iterator_traits<_InputIterator>::value_type>) |
| 515 | __glibcxx_requires_valid_range(__first, __last); |
| 516 | return std::__find_if_not(__first, __last, |
| 517 | __gnu_cxx::__ops::__pred_iter(__pred)); |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * @brief Checks whether the sequence is partitioned. |
| 522 | * @ingroup mutating_algorithms |
| 523 | * @param __first An input iterator. |
| 524 | * @param __last An input iterator. |
| 525 | * @param __pred A predicate. |
| 526 | * @return True if the range @p [__first,__last) is partioned by @p __pred, |
| 527 | * i.e. if all elements that satisfy @p __pred appear before those that |
| 528 | * do not. |
| 529 | */ |
| 530 | template<typename _InputIterator, typename _Predicate> |
| 531 | _GLIBCXX20_CONSTEXPR |
| 532 | inline bool |
| 533 | is_partitioned(_InputIterator __first, _InputIterator __last, |
| 534 | _Predicate __pred) |
| 535 | { |
| 536 | __first = std::find_if_not(__first, __last, __pred); |
| 537 | if (__first == __last) |
| 538 | return true; |
| 539 | ++__first; |
| 540 | return std::none_of(__first, __last, __pred); |
| 541 | } |
| 542 | |
| 543 | /** |
| 544 | * @brief Find the partition point of a partitioned range. |
| 545 | * @ingroup mutating_algorithms |
| 546 | * @param __first An iterator. |
| 547 | * @param __last Another iterator. |
| 548 | * @param __pred A predicate. |
| 549 | * @return An iterator @p mid such that @p all_of(__first, mid, __pred) |
| 550 | * and @p none_of(mid, __last, __pred) are both true. |
| 551 | */ |
| 552 | template<typename _ForwardIterator, typename _Predicate> |
| 553 | _GLIBCXX20_CONSTEXPR |
| 554 | _ForwardIterator |
| 555 | partition_point(_ForwardIterator __first, _ForwardIterator __last, |
| 556 | _Predicate __pred) |
| 557 | { |
| 558 | // concept requirements |
| 559 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 560 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 561 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 562 | |
| 563 | // A specific debug-mode test will be necessary... |
| 564 | __glibcxx_requires_valid_range(__first, __last); |
| 565 | |
| 566 | typedef typename iterator_traits<_ForwardIterator>::difference_type |
| 567 | _DistanceType; |
| 568 | |
| 569 | _DistanceType __len = std::distance(__first, __last); |
| 570 | |
| 571 | while (__len > 0) |
| 572 | { |
| 573 | _DistanceType __half = __len >> 1; |
| 574 | _ForwardIterator __middle = __first; |
| 575 | std::advance(__middle, __half); |
| 576 | if (__pred(*__middle)) |
| 577 | { |
| 578 | __first = __middle; |
| 579 | ++__first; |
| 580 | __len = __len - __half - 1; |
| 581 | } |
| 582 | else |
| 583 | __len = __half; |
| 584 | } |
| 585 | return __first; |
| 586 | } |
| 587 | #endif |
| 588 | |
| 589 | template<typename _InputIterator, typename _OutputIterator, |
| 590 | typename _Predicate> |
| 591 | _GLIBCXX20_CONSTEXPR |
| 592 | _OutputIterator |
| 593 | __remove_copy_if(_InputIterator __first, _InputIterator __last, |
| 594 | _OutputIterator __result, _Predicate __pred) |
| 595 | { |
| 596 | for (; __first != __last; ++__first) |
| 597 | if (!__pred(__first)) |
| 598 | { |
| 599 | *__result = *__first; |
| 600 | ++__result; |
| 601 | } |
| 602 | return __result; |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * @brief Copy a sequence, removing elements of a given value. |
| 607 | * @ingroup mutating_algorithms |
| 608 | * @param __first An input iterator. |
| 609 | * @param __last An input iterator. |
| 610 | * @param __result An output iterator. |
| 611 | * @param __value The value to be removed. |
| 612 | * @return An iterator designating the end of the resulting sequence. |
| 613 | * |
| 614 | * Copies each element in the range @p [__first,__last) not equal |
| 615 | * to @p __value to the range beginning at @p __result. |
| 616 | * remove_copy() is stable, so the relative order of elements that |
| 617 | * are copied is unchanged. |
| 618 | */ |
| 619 | template<typename _InputIterator, typename _OutputIterator, typename _Tp> |
| 620 | _GLIBCXX20_CONSTEXPR |
| 621 | inline _OutputIterator |
| 622 | remove_copy(_InputIterator __first, _InputIterator __last, |
| 623 | _OutputIterator __result, const _Tp& __value) |
| 624 | { |
| 625 | // concept requirements |
| 626 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 627 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 628 | typename iterator_traits<_InputIterator>::value_type>) |
| 629 | __glibcxx_function_requires(_EqualOpConcept< |
| 630 | typename iterator_traits<_InputIterator>::value_type, _Tp>) |
| 631 | __glibcxx_requires_valid_range(__first, __last); |
| 632 | |
| 633 | return std::__remove_copy_if(__first, __last, __result, |
| 634 | __gnu_cxx::__ops::__iter_equals_val(__value)); |
| 635 | } |
| 636 | |
| 637 | /** |
| 638 | * @brief Copy a sequence, removing elements for which a predicate is true. |
| 639 | * @ingroup mutating_algorithms |
| 640 | * @param __first An input iterator. |
| 641 | * @param __last An input iterator. |
| 642 | * @param __result An output iterator. |
| 643 | * @param __pred A predicate. |
| 644 | * @return An iterator designating the end of the resulting sequence. |
| 645 | * |
| 646 | * Copies each element in the range @p [__first,__last) for which |
| 647 | * @p __pred returns false to the range beginning at @p __result. |
| 648 | * |
| 649 | * remove_copy_if() is stable, so the relative order of elements that are |
| 650 | * copied is unchanged. |
| 651 | */ |
| 652 | template<typename _InputIterator, typename _OutputIterator, |
| 653 | typename _Predicate> |
| 654 | _GLIBCXX20_CONSTEXPR |
| 655 | inline _OutputIterator |
| 656 | remove_copy_if(_InputIterator __first, _InputIterator __last, |
| 657 | _OutputIterator __result, _Predicate __pred) |
| 658 | { |
| 659 | // concept requirements |
| 660 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 661 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 662 | typename iterator_traits<_InputIterator>::value_type>) |
| 663 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 664 | typename iterator_traits<_InputIterator>::value_type>) |
| 665 | __glibcxx_requires_valid_range(__first, __last); |
| 666 | |
| 667 | return std::__remove_copy_if(__first, __last, __result, |
| 668 | __gnu_cxx::__ops::__pred_iter(__pred)); |
| 669 | } |
| 670 | |
| 671 | #if __cplusplus >= 201103L |
| 672 | /** |
| 673 | * @brief Copy the elements of a sequence for which a predicate is true. |
| 674 | * @ingroup mutating_algorithms |
| 675 | * @param __first An input iterator. |
| 676 | * @param __last An input iterator. |
| 677 | * @param __result An output iterator. |
| 678 | * @param __pred A predicate. |
| 679 | * @return An iterator designating the end of the resulting sequence. |
| 680 | * |
| 681 | * Copies each element in the range @p [__first,__last) for which |
| 682 | * @p __pred returns true to the range beginning at @p __result. |
| 683 | * |
| 684 | * copy_if() is stable, so the relative order of elements that are |
| 685 | * copied is unchanged. |
| 686 | */ |
| 687 | template<typename _InputIterator, typename _OutputIterator, |
| 688 | typename _Predicate> |
| 689 | _GLIBCXX20_CONSTEXPR |
| 690 | _OutputIterator |
| 691 | copy_if(_InputIterator __first, _InputIterator __last, |
| 692 | _OutputIterator __result, _Predicate __pred) |
| 693 | { |
| 694 | // concept requirements |
| 695 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 696 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 697 | typename iterator_traits<_InputIterator>::value_type>) |
| 698 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 699 | typename iterator_traits<_InputIterator>::value_type>) |
| 700 | __glibcxx_requires_valid_range(__first, __last); |
| 701 | |
| 702 | for (; __first != __last; ++__first) |
| 703 | if (__pred(*__first)) |
| 704 | { |
| 705 | *__result = *__first; |
| 706 | ++__result; |
| 707 | } |
| 708 | return __result; |
| 709 | } |
| 710 | |
| 711 | template<typename _InputIterator, typename _Size, typename _OutputIterator> |
| 712 | _GLIBCXX20_CONSTEXPR |
| 713 | _OutputIterator |
| 714 | __copy_n(_InputIterator __first, _Size __n, |
| 715 | _OutputIterator __result, input_iterator_tag) |
| 716 | { |
| 717 | return std::__niter_wrap(__result, |
| 718 | __copy_n_a(__first, __n, |
| 719 | std::__niter_base(__result), true)); |
| 720 | } |
| 721 | |
| 722 | template<typename _RandomAccessIterator, typename _Size, |
| 723 | typename _OutputIterator> |
| 724 | _GLIBCXX20_CONSTEXPR |
| 725 | inline _OutputIterator |
| 726 | __copy_n(_RandomAccessIterator __first, _Size __n, |
| 727 | _OutputIterator __result, random_access_iterator_tag) |
| 728 | { return std::copy(__first, __first + __n, __result); } |
| 729 | |
| 730 | /** |
| 731 | * @brief Copies the range [first,first+n) into [result,result+n). |
| 732 | * @ingroup mutating_algorithms |
| 733 | * @param __first An input iterator. |
| 734 | * @param __n The number of elements to copy. |
| 735 | * @param __result An output iterator. |
| 736 | * @return result+n. |
| 737 | * |
| 738 | * This inline function will boil down to a call to @c memmove whenever |
| 739 | * possible. Failing that, if random access iterators are passed, then the |
| 740 | * loop count will be known (and therefore a candidate for compiler |
| 741 | * optimizations such as unrolling). |
| 742 | */ |
| 743 | template<typename _InputIterator, typename _Size, typename _OutputIterator> |
| 744 | _GLIBCXX20_CONSTEXPR |
| 745 | inline _OutputIterator |
| 746 | copy_n(_InputIterator __first, _Size __n, _OutputIterator __result) |
| 747 | { |
| 748 | // concept requirements |
| 749 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 750 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 751 | typename iterator_traits<_InputIterator>::value_type>) |
| 752 | |
| 753 | const auto __n2 = std::__size_to_integer(__n); |
| 754 | if (__n2 <= 0) |
| 755 | return __result; |
| 756 | |
| 757 | __glibcxx_requires_can_increment(__first, __n2); |
| 758 | __glibcxx_requires_can_increment(__result, __n2); |
| 759 | |
| 760 | return std::__copy_n(__first, __n2, __result, |
| 761 | std::__iterator_category(__first)); |
| 762 | } |
| 763 | |
| 764 | /** |
| 765 | * @brief Copy the elements of a sequence to separate output sequences |
| 766 | * depending on the truth value of a predicate. |
| 767 | * @ingroup mutating_algorithms |
| 768 | * @param __first An input iterator. |
| 769 | * @param __last An input iterator. |
| 770 | * @param __out_true An output iterator. |
| 771 | * @param __out_false An output iterator. |
| 772 | * @param __pred A predicate. |
| 773 | * @return A pair designating the ends of the resulting sequences. |
| 774 | * |
| 775 | * Copies each element in the range @p [__first,__last) for which |
| 776 | * @p __pred returns true to the range beginning at @p out_true |
| 777 | * and each element for which @p __pred returns false to @p __out_false. |
| 778 | */ |
| 779 | template<typename _InputIterator, typename _OutputIterator1, |
| 780 | typename _OutputIterator2, typename _Predicate> |
| 781 | _GLIBCXX20_CONSTEXPR |
| 782 | pair<_OutputIterator1, _OutputIterator2> |
| 783 | partition_copy(_InputIterator __first, _InputIterator __last, |
| 784 | _OutputIterator1 __out_true, _OutputIterator2 __out_false, |
| 785 | _Predicate __pred) |
| 786 | { |
| 787 | // concept requirements |
| 788 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 789 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator1, |
| 790 | typename iterator_traits<_InputIterator>::value_type>) |
| 791 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator2, |
| 792 | typename iterator_traits<_InputIterator>::value_type>) |
| 793 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 794 | typename iterator_traits<_InputIterator>::value_type>) |
| 795 | __glibcxx_requires_valid_range(__first, __last); |
| 796 | |
| 797 | for (; __first != __last; ++__first) |
| 798 | if (__pred(*__first)) |
| 799 | { |
| 800 | *__out_true = *__first; |
| 801 | ++__out_true; |
| 802 | } |
| 803 | else |
| 804 | { |
| 805 | *__out_false = *__first; |
| 806 | ++__out_false; |
| 807 | } |
| 808 | |
| 809 | return pair<_OutputIterator1, _OutputIterator2>(__out_true, __out_false); |
| 810 | } |
| 811 | #endif // C++11 |
| 812 | |
| 813 | /** |
| 814 | * @brief Remove elements from a sequence. |
| 815 | * @ingroup mutating_algorithms |
| 816 | * @param __first An input iterator. |
| 817 | * @param __last An input iterator. |
| 818 | * @param __value The value to be removed. |
| 819 | * @return An iterator designating the end of the resulting sequence. |
| 820 | * |
| 821 | * All elements equal to @p __value are removed from the range |
| 822 | * @p [__first,__last). |
| 823 | * |
| 824 | * remove() is stable, so the relative order of elements that are |
| 825 | * not removed is unchanged. |
| 826 | * |
| 827 | * Elements between the end of the resulting sequence and @p __last |
| 828 | * are still present, but their value is unspecified. |
| 829 | */ |
| 830 | template<typename _ForwardIterator, typename _Tp> |
| 831 | _GLIBCXX20_CONSTEXPR |
| 832 | inline _ForwardIterator |
| 833 | remove(_ForwardIterator __first, _ForwardIterator __last, |
| 834 | const _Tp& __value) |
| 835 | { |
| 836 | // concept requirements |
| 837 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 838 | _ForwardIterator>) |
| 839 | __glibcxx_function_requires(_EqualOpConcept< |
| 840 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 841 | __glibcxx_requires_valid_range(__first, __last); |
| 842 | |
| 843 | return std::__remove_if(__first, __last, |
| 844 | __gnu_cxx::__ops::__iter_equals_val(__value)); |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * @brief Remove elements from a sequence using a predicate. |
| 849 | * @ingroup mutating_algorithms |
| 850 | * @param __first A forward iterator. |
| 851 | * @param __last A forward iterator. |
| 852 | * @param __pred A predicate. |
| 853 | * @return An iterator designating the end of the resulting sequence. |
| 854 | * |
| 855 | * All elements for which @p __pred returns true are removed from the range |
| 856 | * @p [__first,__last). |
| 857 | * |
| 858 | * remove_if() is stable, so the relative order of elements that are |
| 859 | * not removed is unchanged. |
| 860 | * |
| 861 | * Elements between the end of the resulting sequence and @p __last |
| 862 | * are still present, but their value is unspecified. |
| 863 | */ |
| 864 | template<typename _ForwardIterator, typename _Predicate> |
| 865 | _GLIBCXX20_CONSTEXPR |
| 866 | inline _ForwardIterator |
| 867 | remove_if(_ForwardIterator __first, _ForwardIterator __last, |
| 868 | _Predicate __pred) |
| 869 | { |
| 870 | // concept requirements |
| 871 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 872 | _ForwardIterator>) |
| 873 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 874 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 875 | __glibcxx_requires_valid_range(__first, __last); |
| 876 | |
| 877 | return std::__remove_if(__first, __last, |
| 878 | __gnu_cxx::__ops::__pred_iter(__pred)); |
| 879 | } |
| 880 | |
| 881 | template<typename _ForwardIterator, typename _BinaryPredicate> |
| 882 | _GLIBCXX20_CONSTEXPR |
| 883 | _ForwardIterator |
| 884 | __adjacent_find(_ForwardIterator __first, _ForwardIterator __last, |
| 885 | _BinaryPredicate __binary_pred) |
| 886 | { |
| 887 | if (__first == __last) |
| 888 | return __last; |
| 889 | _ForwardIterator __next = __first; |
| 890 | while (++__next != __last) |
| 891 | { |
| 892 | if (__binary_pred(__first, __next)) |
| 893 | return __first; |
| 894 | __first = __next; |
| 895 | } |
| 896 | return __last; |
| 897 | } |
| 898 | |
| 899 | template<typename _ForwardIterator, typename _BinaryPredicate> |
| 900 | _GLIBCXX20_CONSTEXPR |
| 901 | _ForwardIterator |
| 902 | __unique(_ForwardIterator __first, _ForwardIterator __last, |
| 903 | _BinaryPredicate __binary_pred) |
| 904 | { |
| 905 | // Skip the beginning, if already unique. |
| 906 | __first = std::__adjacent_find(__first, __last, __binary_pred); |
| 907 | if (__first == __last) |
| 908 | return __last; |
| 909 | |
| 910 | // Do the real copy work. |
| 911 | _ForwardIterator __dest = __first; |
| 912 | ++__first; |
| 913 | while (++__first != __last) |
| 914 | if (!__binary_pred(__dest, __first)) |
| 915 | *++__dest = _GLIBCXX_MOVE(*__first); |
| 916 | return ++__dest; |
| 917 | } |
| 918 | |
| 919 | /** |
| 920 | * @brief Remove consecutive duplicate values from a sequence. |
| 921 | * @ingroup mutating_algorithms |
| 922 | * @param __first A forward iterator. |
| 923 | * @param __last A forward iterator. |
| 924 | * @return An iterator designating the end of the resulting sequence. |
| 925 | * |
| 926 | * Removes all but the first element from each group of consecutive |
| 927 | * values that compare equal. |
| 928 | * unique() is stable, so the relative order of elements that are |
| 929 | * not removed is unchanged. |
| 930 | * Elements between the end of the resulting sequence and @p __last |
| 931 | * are still present, but their value is unspecified. |
| 932 | */ |
| 933 | template<typename _ForwardIterator> |
| 934 | _GLIBCXX20_CONSTEXPR |
| 935 | inline _ForwardIterator |
| 936 | unique(_ForwardIterator __first, _ForwardIterator __last) |
| 937 | { |
| 938 | // concept requirements |
| 939 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 940 | _ForwardIterator>) |
| 941 | __glibcxx_function_requires(_EqualityComparableConcept< |
| 942 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 943 | __glibcxx_requires_valid_range(__first, __last); |
| 944 | |
| 945 | return std::__unique(__first, __last, |
| 946 | __gnu_cxx::__ops::__iter_equal_to_iter()); |
| 947 | } |
| 948 | |
| 949 | /** |
| 950 | * @brief Remove consecutive values from a sequence using a predicate. |
| 951 | * @ingroup mutating_algorithms |
| 952 | * @param __first A forward iterator. |
| 953 | * @param __last A forward iterator. |
| 954 | * @param __binary_pred A binary predicate. |
| 955 | * @return An iterator designating the end of the resulting sequence. |
| 956 | * |
| 957 | * Removes all but the first element from each group of consecutive |
| 958 | * values for which @p __binary_pred returns true. |
| 959 | * unique() is stable, so the relative order of elements that are |
| 960 | * not removed is unchanged. |
| 961 | * Elements between the end of the resulting sequence and @p __last |
| 962 | * are still present, but their value is unspecified. |
| 963 | */ |
| 964 | template<typename _ForwardIterator, typename _BinaryPredicate> |
| 965 | _GLIBCXX20_CONSTEXPR |
| 966 | inline _ForwardIterator |
| 967 | unique(_ForwardIterator __first, _ForwardIterator __last, |
| 968 | _BinaryPredicate __binary_pred) |
| 969 | { |
| 970 | // concept requirements |
| 971 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 972 | _ForwardIterator>) |
| 973 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 974 | typename iterator_traits<_ForwardIterator>::value_type, |
| 975 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 976 | __glibcxx_requires_valid_range(__first, __last); |
| 977 | |
| 978 | return std::__unique(__first, __last, |
| 979 | __gnu_cxx::__ops::__iter_comp_iter(__binary_pred)); |
| 980 | } |
| 981 | |
| 982 | /** |
| 983 | * This is an uglified |
| 984 | * unique_copy(_InputIterator, _InputIterator, _OutputIterator, |
| 985 | * _BinaryPredicate) |
| 986 | * overloaded for forward iterators and output iterator as result. |
| 987 | */ |
| 988 | template<typename _ForwardIterator, typename _OutputIterator, |
| 989 | typename _BinaryPredicate> |
| 990 | _GLIBCXX20_CONSTEXPR |
| 991 | _OutputIterator |
| 992 | __unique_copy(_ForwardIterator __first, _ForwardIterator __last, |
| 993 | _OutputIterator __result, _BinaryPredicate __binary_pred, |
| 994 | forward_iterator_tag, output_iterator_tag) |
| 995 | { |
| 996 | // concept requirements -- iterators already checked |
| 997 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 998 | typename iterator_traits<_ForwardIterator>::value_type, |
| 999 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 1000 | |
| 1001 | _ForwardIterator __next = __first; |
| 1002 | *__result = *__first; |
| 1003 | while (++__next != __last) |
| 1004 | if (!__binary_pred(__first, __next)) |
| 1005 | { |
| 1006 | __first = __next; |
| 1007 | *++__result = *__first; |
| 1008 | } |
| 1009 | return ++__result; |
| 1010 | } |
| 1011 | |
| 1012 | /** |
| 1013 | * This is an uglified |
| 1014 | * unique_copy(_InputIterator, _InputIterator, _OutputIterator, |
| 1015 | * _BinaryPredicate) |
| 1016 | * overloaded for input iterators and output iterator as result. |
| 1017 | */ |
| 1018 | template<typename _InputIterator, typename _OutputIterator, |
| 1019 | typename _BinaryPredicate> |
| 1020 | _GLIBCXX20_CONSTEXPR |
| 1021 | _OutputIterator |
| 1022 | __unique_copy(_InputIterator __first, _InputIterator __last, |
| 1023 | _OutputIterator __result, _BinaryPredicate __binary_pred, |
| 1024 | input_iterator_tag, output_iterator_tag) |
| 1025 | { |
| 1026 | // concept requirements -- iterators already checked |
| 1027 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 1028 | typename iterator_traits<_InputIterator>::value_type, |
| 1029 | typename iterator_traits<_InputIterator>::value_type>) |
| 1030 | |
| 1031 | typename iterator_traits<_InputIterator>::value_type __value = *__first; |
| 1032 | __decltype(__gnu_cxx::__ops::__iter_comp_val(__binary_pred)) |
| 1033 | __rebound_pred |
| 1034 | = __gnu_cxx::__ops::__iter_comp_val(__binary_pred); |
| 1035 | *__result = __value; |
| 1036 | while (++__first != __last) |
| 1037 | if (!__rebound_pred(__first, __value)) |
| 1038 | { |
| 1039 | __value = *__first; |
| 1040 | *++__result = __value; |
| 1041 | } |
| 1042 | return ++__result; |
| 1043 | } |
| 1044 | |
| 1045 | /** |
| 1046 | * This is an uglified |
| 1047 | * unique_copy(_InputIterator, _InputIterator, _OutputIterator, |
| 1048 | * _BinaryPredicate) |
| 1049 | * overloaded for input iterators and forward iterator as result. |
| 1050 | */ |
| 1051 | template<typename _InputIterator, typename _ForwardIterator, |
| 1052 | typename _BinaryPredicate> |
| 1053 | _GLIBCXX20_CONSTEXPR |
| 1054 | _ForwardIterator |
| 1055 | __unique_copy(_InputIterator __first, _InputIterator __last, |
| 1056 | _ForwardIterator __result, _BinaryPredicate __binary_pred, |
| 1057 | input_iterator_tag, forward_iterator_tag) |
| 1058 | { |
| 1059 | // concept requirements -- iterators already checked |
| 1060 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 1061 | typename iterator_traits<_ForwardIterator>::value_type, |
| 1062 | typename iterator_traits<_InputIterator>::value_type>) |
| 1063 | *__result = *__first; |
| 1064 | while (++__first != __last) |
| 1065 | if (!__binary_pred(__result, __first)) |
| 1066 | *++__result = *__first; |
| 1067 | return ++__result; |
| 1068 | } |
| 1069 | |
| 1070 | /** |
| 1071 | * This is an uglified reverse(_BidirectionalIterator, |
| 1072 | * _BidirectionalIterator) |
| 1073 | * overloaded for bidirectional iterators. |
| 1074 | */ |
| 1075 | template<typename _BidirectionalIterator> |
| 1076 | _GLIBCXX20_CONSTEXPR |
| 1077 | void |
| 1078 | __reverse(_BidirectionalIterator __first, _BidirectionalIterator __last, |
| 1079 | bidirectional_iterator_tag) |
| 1080 | { |
| 1081 | while (true) |
| 1082 | if (__first == __last || __first == --__last) |
| 1083 | return; |
| 1084 | else |
| 1085 | { |
| 1086 | std::iter_swap(__first, __last); |
| 1087 | ++__first; |
| 1088 | } |
| 1089 | } |
| 1090 | |
| 1091 | /** |
| 1092 | * This is an uglified reverse(_BidirectionalIterator, |
| 1093 | * _BidirectionalIterator) |
| 1094 | * overloaded for random access iterators. |
| 1095 | */ |
| 1096 | template<typename _RandomAccessIterator> |
| 1097 | _GLIBCXX20_CONSTEXPR |
| 1098 | void |
| 1099 | __reverse(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 1100 | random_access_iterator_tag) |
| 1101 | { |
| 1102 | if (__first == __last) |
| 1103 | return; |
| 1104 | --__last; |
| 1105 | while (__first < __last) |
| 1106 | { |
| 1107 | std::iter_swap(__first, __last); |
| 1108 | ++__first; |
| 1109 | --__last; |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | /** |
| 1114 | * @brief Reverse a sequence. |
| 1115 | * @ingroup mutating_algorithms |
| 1116 | * @param __first A bidirectional iterator. |
| 1117 | * @param __last A bidirectional iterator. |
| 1118 | * @return reverse() returns no value. |
| 1119 | * |
| 1120 | * Reverses the order of the elements in the range @p [__first,__last), |
| 1121 | * so that the first element becomes the last etc. |
| 1122 | * For every @c i such that @p 0<=i<=(__last-__first)/2), @p reverse() |
| 1123 | * swaps @p *(__first+i) and @p *(__last-(i+1)) |
| 1124 | */ |
| 1125 | template<typename _BidirectionalIterator> |
| 1126 | _GLIBCXX20_CONSTEXPR |
| 1127 | inline void |
| 1128 | reverse(_BidirectionalIterator __first, _BidirectionalIterator __last) |
| 1129 | { |
| 1130 | // concept requirements |
| 1131 | __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< |
| 1132 | _BidirectionalIterator>) |
| 1133 | __glibcxx_requires_valid_range(__first, __last); |
| 1134 | std::__reverse(__first, __last, std::__iterator_category(__first)); |
| 1135 | } |
| 1136 | |
| 1137 | /** |
| 1138 | * @brief Copy a sequence, reversing its elements. |
| 1139 | * @ingroup mutating_algorithms |
| 1140 | * @param __first A bidirectional iterator. |
| 1141 | * @param __last A bidirectional iterator. |
| 1142 | * @param __result An output iterator. |
| 1143 | * @return An iterator designating the end of the resulting sequence. |
| 1144 | * |
| 1145 | * Copies the elements in the range @p [__first,__last) to the |
| 1146 | * range @p [__result,__result+(__last-__first)) such that the |
| 1147 | * order of the elements is reversed. For every @c i such that @p |
| 1148 | * 0<=i<=(__last-__first), @p reverse_copy() performs the |
| 1149 | * assignment @p *(__result+(__last-__first)-1-i) = *(__first+i). |
| 1150 | * The ranges @p [__first,__last) and @p |
| 1151 | * [__result,__result+(__last-__first)) must not overlap. |
| 1152 | */ |
| 1153 | template<typename _BidirectionalIterator, typename _OutputIterator> |
| 1154 | _GLIBCXX20_CONSTEXPR |
| 1155 | _OutputIterator |
| 1156 | reverse_copy(_BidirectionalIterator __first, _BidirectionalIterator __last, |
| 1157 | _OutputIterator __result) |
| 1158 | { |
| 1159 | // concept requirements |
| 1160 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 1161 | _BidirectionalIterator>) |
| 1162 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 1163 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 1164 | __glibcxx_requires_valid_range(__first, __last); |
| 1165 | |
| 1166 | while (__first != __last) |
| 1167 | { |
| 1168 | --__last; |
| 1169 | *__result = *__last; |
| 1170 | ++__result; |
| 1171 | } |
| 1172 | return __result; |
| 1173 | } |
| 1174 | |
| 1175 | /** |
| 1176 | * This is a helper function for the rotate algorithm specialized on RAIs. |
| 1177 | * It returns the greatest common divisor of two integer values. |
| 1178 | */ |
| 1179 | template<typename _EuclideanRingElement> |
| 1180 | _GLIBCXX20_CONSTEXPR |
| 1181 | _EuclideanRingElement |
| 1182 | __gcd(_EuclideanRingElement __m, _EuclideanRingElement __n) |
| 1183 | { |
| 1184 | while (__n != 0) |
| 1185 | { |
| 1186 | _EuclideanRingElement __t = __m % __n; |
| 1187 | __m = __n; |
| 1188 | __n = __t; |
| 1189 | } |
| 1190 | return __m; |
| 1191 | } |
| 1192 | |
| 1193 | inline namespace _V2 |
| 1194 | { |
| 1195 | |
| 1196 | /// This is a helper function for the rotate algorithm. |
| 1197 | template<typename _ForwardIterator> |
| 1198 | _GLIBCXX20_CONSTEXPR |
| 1199 | _ForwardIterator |
| 1200 | __rotate(_ForwardIterator __first, |
| 1201 | _ForwardIterator __middle, |
| 1202 | _ForwardIterator __last, |
| 1203 | forward_iterator_tag) |
| 1204 | { |
| 1205 | if (__first == __middle) |
| 1206 | return __last; |
| 1207 | else if (__last == __middle) |
| 1208 | return __first; |
| 1209 | |
| 1210 | _ForwardIterator __first2 = __middle; |
| 1211 | do |
| 1212 | { |
| 1213 | std::iter_swap(__first, __first2); |
| 1214 | ++__first; |
| 1215 | ++__first2; |
| 1216 | if (__first == __middle) |
| 1217 | __middle = __first2; |
| 1218 | } |
| 1219 | while (__first2 != __last); |
| 1220 | |
| 1221 | _ForwardIterator __ret = __first; |
| 1222 | |
| 1223 | __first2 = __middle; |
| 1224 | |
| 1225 | while (__first2 != __last) |
| 1226 | { |
| 1227 | std::iter_swap(__first, __first2); |
| 1228 | ++__first; |
| 1229 | ++__first2; |
| 1230 | if (__first == __middle) |
| 1231 | __middle = __first2; |
| 1232 | else if (__first2 == __last) |
| 1233 | __first2 = __middle; |
| 1234 | } |
| 1235 | return __ret; |
| 1236 | } |
| 1237 | |
| 1238 | /// This is a helper function for the rotate algorithm. |
| 1239 | template<typename _BidirectionalIterator> |
| 1240 | _GLIBCXX20_CONSTEXPR |
| 1241 | _BidirectionalIterator |
| 1242 | __rotate(_BidirectionalIterator __first, |
| 1243 | _BidirectionalIterator __middle, |
| 1244 | _BidirectionalIterator __last, |
| 1245 | bidirectional_iterator_tag) |
| 1246 | { |
| 1247 | // concept requirements |
| 1248 | __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< |
| 1249 | _BidirectionalIterator>) |
| 1250 | |
| 1251 | if (__first == __middle) |
| 1252 | return __last; |
| 1253 | else if (__last == __middle) |
| 1254 | return __first; |
| 1255 | |
| 1256 | std::__reverse(__first, __middle, bidirectional_iterator_tag()); |
| 1257 | std::__reverse(__middle, __last, bidirectional_iterator_tag()); |
| 1258 | |
| 1259 | while (__first != __middle && __middle != __last) |
| 1260 | { |
| 1261 | std::iter_swap(__first, --__last); |
| 1262 | ++__first; |
| 1263 | } |
| 1264 | |
| 1265 | if (__first == __middle) |
| 1266 | { |
| 1267 | std::__reverse(__middle, __last, bidirectional_iterator_tag()); |
| 1268 | return __last; |
| 1269 | } |
| 1270 | else |
| 1271 | { |
| 1272 | std::__reverse(__first, __middle, bidirectional_iterator_tag()); |
| 1273 | return __first; |
| 1274 | } |
| 1275 | } |
| 1276 | |
| 1277 | /// This is a helper function for the rotate algorithm. |
| 1278 | template<typename _RandomAccessIterator> |
| 1279 | _GLIBCXX20_CONSTEXPR |
| 1280 | _RandomAccessIterator |
| 1281 | __rotate(_RandomAccessIterator __first, |
| 1282 | _RandomAccessIterator __middle, |
| 1283 | _RandomAccessIterator __last, |
| 1284 | random_access_iterator_tag) |
| 1285 | { |
| 1286 | // concept requirements |
| 1287 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 1288 | _RandomAccessIterator>) |
| 1289 | |
| 1290 | if (__first == __middle) |
| 1291 | return __last; |
| 1292 | else if (__last == __middle) |
| 1293 | return __first; |
| 1294 | |
| 1295 | typedef typename iterator_traits<_RandomAccessIterator>::difference_type |
| 1296 | _Distance; |
| 1297 | typedef typename iterator_traits<_RandomAccessIterator>::value_type |
| 1298 | _ValueType; |
| 1299 | |
| 1300 | _Distance __n = __last - __first; |
| 1301 | _Distance __k = __middle - __first; |
| 1302 | |
| 1303 | if (__k == __n - __k) |
| 1304 | { |
| 1305 | std::swap_ranges(__first, __middle, __middle); |
| 1306 | return __middle; |
| 1307 | } |
| 1308 | |
| 1309 | _RandomAccessIterator __p = __first; |
| 1310 | _RandomAccessIterator __ret = __first + (__last - __middle); |
| 1311 | |
| 1312 | for (;;) |
| 1313 | { |
| 1314 | if (__k < __n - __k) |
| 1315 | { |
| 1316 | if (__is_pod(_ValueType) && __k == 1) |
| 1317 | { |
| 1318 | _ValueType __t = _GLIBCXX_MOVE(*__p); |
| 1319 | _GLIBCXX_MOVE3(__p + 1, __p + __n, __p); |
| 1320 | *(__p + __n - 1) = _GLIBCXX_MOVE(__t); |
| 1321 | return __ret; |
| 1322 | } |
| 1323 | _RandomAccessIterator __q = __p + __k; |
| 1324 | for (_Distance __i = 0; __i < __n - __k; ++ __i) |
| 1325 | { |
| 1326 | std::iter_swap(__p, __q); |
| 1327 | ++__p; |
| 1328 | ++__q; |
| 1329 | } |
| 1330 | __n %= __k; |
| 1331 | if (__n == 0) |
| 1332 | return __ret; |
| 1333 | std::swap(__n, __k); |
| 1334 | __k = __n - __k; |
| 1335 | } |
| 1336 | else |
| 1337 | { |
| 1338 | __k = __n - __k; |
| 1339 | if (__is_pod(_ValueType) && __k == 1) |
| 1340 | { |
| 1341 | _ValueType __t = _GLIBCXX_MOVE(*(__p + __n - 1)); |
| 1342 | _GLIBCXX_MOVE_BACKWARD3(__p, __p + __n - 1, __p + __n); |
| 1343 | *__p = _GLIBCXX_MOVE(__t); |
| 1344 | return __ret; |
| 1345 | } |
| 1346 | _RandomAccessIterator __q = __p + __n; |
| 1347 | __p = __q - __k; |
| 1348 | for (_Distance __i = 0; __i < __n - __k; ++ __i) |
| 1349 | { |
| 1350 | --__p; |
| 1351 | --__q; |
| 1352 | std::iter_swap(__p, __q); |
| 1353 | } |
| 1354 | __n %= __k; |
| 1355 | if (__n == 0) |
| 1356 | return __ret; |
| 1357 | std::swap(__n, __k); |
| 1358 | } |
| 1359 | } |
| 1360 | } |
| 1361 | |
| 1362 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 1363 | // DR 488. rotate throws away useful information |
| 1364 | /** |
| 1365 | * @brief Rotate the elements of a sequence. |
| 1366 | * @ingroup mutating_algorithms |
| 1367 | * @param __first A forward iterator. |
| 1368 | * @param __middle A forward iterator. |
| 1369 | * @param __last A forward iterator. |
| 1370 | * @return first + (last - middle). |
| 1371 | * |
| 1372 | * Rotates the elements of the range @p [__first,__last) by |
| 1373 | * @p (__middle - __first) positions so that the element at @p __middle |
| 1374 | * is moved to @p __first, the element at @p __middle+1 is moved to |
| 1375 | * @p __first+1 and so on for each element in the range |
| 1376 | * @p [__first,__last). |
| 1377 | * |
| 1378 | * This effectively swaps the ranges @p [__first,__middle) and |
| 1379 | * @p [__middle,__last). |
| 1380 | * |
| 1381 | * Performs |
| 1382 | * @p *(__first+(n+(__last-__middle))%(__last-__first))=*(__first+n) |
| 1383 | * for each @p n in the range @p [0,__last-__first). |
| 1384 | */ |
| 1385 | template<typename _ForwardIterator> |
| 1386 | _GLIBCXX20_CONSTEXPR |
| 1387 | inline _ForwardIterator |
| 1388 | rotate(_ForwardIterator __first, _ForwardIterator __middle, |
| 1389 | _ForwardIterator __last) |
| 1390 | { |
| 1391 | // concept requirements |
| 1392 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 1393 | _ForwardIterator>) |
| 1394 | __glibcxx_requires_valid_range(__first, __middle); |
| 1395 | __glibcxx_requires_valid_range(__middle, __last); |
| 1396 | |
| 1397 | return std::__rotate(__first, __middle, __last, |
| 1398 | std::__iterator_category(__first)); |
| 1399 | } |
| 1400 | |
| 1401 | } // namespace _V2 |
| 1402 | |
| 1403 | /** |
| 1404 | * @brief Copy a sequence, rotating its elements. |
| 1405 | * @ingroup mutating_algorithms |
| 1406 | * @param __first A forward iterator. |
| 1407 | * @param __middle A forward iterator. |
| 1408 | * @param __last A forward iterator. |
| 1409 | * @param __result An output iterator. |
| 1410 | * @return An iterator designating the end of the resulting sequence. |
| 1411 | * |
| 1412 | * Copies the elements of the range @p [__first,__last) to the |
| 1413 | * range beginning at @result, rotating the copied elements by |
| 1414 | * @p (__middle-__first) positions so that the element at @p __middle |
| 1415 | * is moved to @p __result, the element at @p __middle+1 is moved |
| 1416 | * to @p __result+1 and so on for each element in the range @p |
| 1417 | * [__first,__last). |
| 1418 | * |
| 1419 | * Performs |
| 1420 | * @p *(__result+(n+(__last-__middle))%(__last-__first))=*(__first+n) |
| 1421 | * for each @p n in the range @p [0,__last-__first). |
| 1422 | */ |
| 1423 | template<typename _ForwardIterator, typename _OutputIterator> |
| 1424 | _GLIBCXX20_CONSTEXPR |
| 1425 | inline _OutputIterator |
| 1426 | rotate_copy(_ForwardIterator __first, _ForwardIterator __middle, |
| 1427 | _ForwardIterator __last, _OutputIterator __result) |
| 1428 | { |
| 1429 | // concept requirements |
| 1430 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 1431 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 1432 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 1433 | __glibcxx_requires_valid_range(__first, __middle); |
| 1434 | __glibcxx_requires_valid_range(__middle, __last); |
| 1435 | |
| 1436 | return std::copy(__first, __middle, |
| 1437 | std::copy(__middle, __last, __result)); |
| 1438 | } |
| 1439 | |
| 1440 | /// This is a helper function... |
| 1441 | template<typename _ForwardIterator, typename _Predicate> |
| 1442 | _GLIBCXX20_CONSTEXPR |
| 1443 | _ForwardIterator |
| 1444 | __partition(_ForwardIterator __first, _ForwardIterator __last, |
| 1445 | _Predicate __pred, forward_iterator_tag) |
| 1446 | { |
| 1447 | if (__first == __last) |
| 1448 | return __first; |
| 1449 | |
| 1450 | while (__pred(*__first)) |
| 1451 | if (++__first == __last) |
| 1452 | return __first; |
| 1453 | |
| 1454 | _ForwardIterator __next = __first; |
| 1455 | |
| 1456 | while (++__next != __last) |
| 1457 | if (__pred(*__next)) |
| 1458 | { |
| 1459 | std::iter_swap(__first, __next); |
| 1460 | ++__first; |
| 1461 | } |
| 1462 | |
| 1463 | return __first; |
| 1464 | } |
| 1465 | |
| 1466 | /// This is a helper function... |
| 1467 | template<typename _BidirectionalIterator, typename _Predicate> |
| 1468 | _GLIBCXX20_CONSTEXPR |
| 1469 | _BidirectionalIterator |
| 1470 | __partition(_BidirectionalIterator __first, _BidirectionalIterator __last, |
| 1471 | _Predicate __pred, bidirectional_iterator_tag) |
| 1472 | { |
| 1473 | while (true) |
| 1474 | { |
| 1475 | while (true) |
| 1476 | if (__first == __last) |
| 1477 | return __first; |
| 1478 | else if (__pred(*__first)) |
| 1479 | ++__first; |
| 1480 | else |
| 1481 | break; |
| 1482 | --__last; |
| 1483 | while (true) |
| 1484 | if (__first == __last) |
| 1485 | return __first; |
| 1486 | else if (!bool(__pred(*__last))) |
| 1487 | --__last; |
| 1488 | else |
| 1489 | break; |
| 1490 | std::iter_swap(__first, __last); |
| 1491 | ++__first; |
| 1492 | } |
| 1493 | } |
| 1494 | |
| 1495 | // partition |
| 1496 | |
| 1497 | /// This is a helper function... |
| 1498 | /// Requires __first != __last and !__pred(__first) |
| 1499 | /// and __len == distance(__first, __last). |
| 1500 | /// |
| 1501 | /// !__pred(__first) allows us to guarantee that we don't |
| 1502 | /// move-assign an element onto itself. |
| 1503 | template<typename _ForwardIterator, typename _Pointer, typename _Predicate, |
| 1504 | typename _Distance> |
| 1505 | _ForwardIterator |
| 1506 | __stable_partition_adaptive(_ForwardIterator __first, |
| 1507 | _ForwardIterator __last, |
| 1508 | _Predicate __pred, _Distance __len, |
| 1509 | _Pointer __buffer, |
| 1510 | _Distance __buffer_size) |
| 1511 | { |
| 1512 | if (__len == 1) |
| 1513 | return __first; |
| 1514 | |
| 1515 | if (__len <= __buffer_size) |
| 1516 | { |
| 1517 | _ForwardIterator __result1 = __first; |
| 1518 | _Pointer __result2 = __buffer; |
| 1519 | |
| 1520 | // The precondition guarantees that !__pred(__first), so |
| 1521 | // move that element to the buffer before starting the loop. |
| 1522 | // This ensures that we only call __pred once per element. |
| 1523 | *__result2 = _GLIBCXX_MOVE(*__first); |
| 1524 | ++__result2; |
| 1525 | ++__first; |
| 1526 | for (; __first != __last; ++__first) |
| 1527 | if (__pred(__first)) |
| 1528 | { |
| 1529 | *__result1 = _GLIBCXX_MOVE(*__first); |
| 1530 | ++__result1; |
| 1531 | } |
| 1532 | else |
| 1533 | { |
| 1534 | *__result2 = _GLIBCXX_MOVE(*__first); |
| 1535 | ++__result2; |
| 1536 | } |
| 1537 | |
| 1538 | _GLIBCXX_MOVE3(__buffer, __result2, __result1); |
| 1539 | return __result1; |
| 1540 | } |
| 1541 | |
| 1542 | _ForwardIterator __middle = __first; |
| 1543 | std::advance(__middle, __len / 2); |
| 1544 | _ForwardIterator __left_split = |
| 1545 | std::__stable_partition_adaptive(__first, __middle, __pred, |
| 1546 | __len / 2, __buffer, |
| 1547 | __buffer_size); |
| 1548 | |
| 1549 | // Advance past true-predicate values to satisfy this |
| 1550 | // function's preconditions. |
| 1551 | _Distance __right_len = __len - __len / 2; |
| 1552 | _ForwardIterator __right_split = |
| 1553 | std::__find_if_not_n(__middle, __right_len, __pred); |
| 1554 | |
| 1555 | if (__right_len) |
| 1556 | __right_split = |
| 1557 | std::__stable_partition_adaptive(__right_split, __last, __pred, |
| 1558 | __right_len, |
| 1559 | __buffer, __buffer_size); |
| 1560 | |
| 1561 | return std::rotate(__left_split, __middle, __right_split); |
| 1562 | } |
| 1563 | |
| 1564 | template<typename _ForwardIterator, typename _Predicate> |
| 1565 | _ForwardIterator |
| 1566 | __stable_partition(_ForwardIterator __first, _ForwardIterator __last, |
| 1567 | _Predicate __pred) |
| 1568 | { |
| 1569 | __first = std::__find_if_not(__first, __last, __pred); |
| 1570 | |
| 1571 | if (__first == __last) |
| 1572 | return __first; |
| 1573 | |
| 1574 | typedef typename iterator_traits<_ForwardIterator>::value_type |
| 1575 | _ValueType; |
| 1576 | typedef typename iterator_traits<_ForwardIterator>::difference_type |
| 1577 | _DistanceType; |
| 1578 | |
| 1579 | _Temporary_buffer<_ForwardIterator, _ValueType> |
| 1580 | __buf(__first, std::distance(__first, __last)); |
| 1581 | return |
| 1582 | std::__stable_partition_adaptive(__first, __last, __pred, |
| 1583 | _DistanceType(__buf.requested_size()), |
| 1584 | __buf.begin(), |
| 1585 | _DistanceType(__buf.size())); |
| 1586 | } |
| 1587 | |
| 1588 | /** |
| 1589 | * @brief Move elements for which a predicate is true to the beginning |
| 1590 | * of a sequence, preserving relative ordering. |
| 1591 | * @ingroup mutating_algorithms |
| 1592 | * @param __first A forward iterator. |
| 1593 | * @param __last A forward iterator. |
| 1594 | * @param __pred A predicate functor. |
| 1595 | * @return An iterator @p middle such that @p __pred(i) is true for each |
| 1596 | * iterator @p i in the range @p [first,middle) and false for each @p i |
| 1597 | * in the range @p [middle,last). |
| 1598 | * |
| 1599 | * Performs the same function as @p partition() with the additional |
| 1600 | * guarantee that the relative ordering of elements in each group is |
| 1601 | * preserved, so any two elements @p x and @p y in the range |
| 1602 | * @p [__first,__last) such that @p __pred(x)==__pred(y) will have the same |
| 1603 | * relative ordering after calling @p stable_partition(). |
| 1604 | */ |
| 1605 | template<typename _ForwardIterator, typename _Predicate> |
| 1606 | inline _ForwardIterator |
| 1607 | stable_partition(_ForwardIterator __first, _ForwardIterator __last, |
| 1608 | _Predicate __pred) |
| 1609 | { |
| 1610 | // concept requirements |
| 1611 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 1612 | _ForwardIterator>) |
| 1613 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 1614 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 1615 | __glibcxx_requires_valid_range(__first, __last); |
| 1616 | |
| 1617 | return std::__stable_partition(__first, __last, |
| 1618 | __gnu_cxx::__ops::__pred_iter(__pred)); |
| 1619 | } |
| 1620 | |
| 1621 | /// This is a helper function for the sort routines. |
| 1622 | template<typename _RandomAccessIterator, typename _Compare> |
| 1623 | _GLIBCXX20_CONSTEXPR |
| 1624 | void |
| 1625 | __heap_select(_RandomAccessIterator __first, |
| 1626 | _RandomAccessIterator __middle, |
| 1627 | _RandomAccessIterator __last, _Compare __comp) |
| 1628 | { |
| 1629 | std::__make_heap(__first, __middle, __comp); |
| 1630 | for (_RandomAccessIterator __i = __middle; __i < __last; ++__i) |
| 1631 | if (__comp(__i, __first)) |
| 1632 | std::__pop_heap(__first, __middle, __i, __comp); |
| 1633 | } |
| 1634 | |
| 1635 | // partial_sort |
| 1636 | |
| 1637 | template<typename _InputIterator, typename _RandomAccessIterator, |
| 1638 | typename _Compare> |
| 1639 | _GLIBCXX20_CONSTEXPR |
| 1640 | _RandomAccessIterator |
| 1641 | __partial_sort_copy(_InputIterator __first, _InputIterator __last, |
| 1642 | _RandomAccessIterator __result_first, |
| 1643 | _RandomAccessIterator __result_last, |
| 1644 | _Compare __comp) |
| 1645 | { |
| 1646 | typedef typename iterator_traits<_InputIterator>::value_type |
| 1647 | _InputValueType; |
| 1648 | typedef iterator_traits<_RandomAccessIterator> _RItTraits; |
| 1649 | typedef typename _RItTraits::difference_type _DistanceType; |
| 1650 | |
| 1651 | if (__result_first == __result_last) |
| 1652 | return __result_last; |
| 1653 | _RandomAccessIterator __result_real_last = __result_first; |
| 1654 | while (__first != __last && __result_real_last != __result_last) |
| 1655 | { |
| 1656 | *__result_real_last = *__first; |
| 1657 | ++__result_real_last; |
| 1658 | ++__first; |
| 1659 | } |
| 1660 | |
| 1661 | std::__make_heap(__result_first, __result_real_last, __comp); |
| 1662 | while (__first != __last) |
| 1663 | { |
| 1664 | if (__comp(__first, __result_first)) |
| 1665 | std::__adjust_heap(__result_first, _DistanceType(0), |
| 1666 | _DistanceType(__result_real_last |
| 1667 | - __result_first), |
| 1668 | _InputValueType(*__first), __comp); |
| 1669 | ++__first; |
| 1670 | } |
| 1671 | std::__sort_heap(__result_first, __result_real_last, __comp); |
| 1672 | return __result_real_last; |
| 1673 | } |
| 1674 | |
| 1675 | /** |
| 1676 | * @brief Copy the smallest elements of a sequence. |
| 1677 | * @ingroup sorting_algorithms |
| 1678 | * @param __first An iterator. |
| 1679 | * @param __last Another iterator. |
| 1680 | * @param __result_first A random-access iterator. |
| 1681 | * @param __result_last Another random-access iterator. |
| 1682 | * @return An iterator indicating the end of the resulting sequence. |
| 1683 | * |
| 1684 | * Copies and sorts the smallest N values from the range @p [__first,__last) |
| 1685 | * to the range beginning at @p __result_first, where the number of |
| 1686 | * elements to be copied, @p N, is the smaller of @p (__last-__first) and |
| 1687 | * @p (__result_last-__result_first). |
| 1688 | * After the sort if @e i and @e j are iterators in the range |
| 1689 | * @p [__result_first,__result_first+N) such that i precedes j then |
| 1690 | * *j<*i is false. |
| 1691 | * The value returned is @p __result_first+N. |
| 1692 | */ |
| 1693 | template<typename _InputIterator, typename _RandomAccessIterator> |
| 1694 | _GLIBCXX20_CONSTEXPR |
| 1695 | inline _RandomAccessIterator |
| 1696 | partial_sort_copy(_InputIterator __first, _InputIterator __last, |
| 1697 | _RandomAccessIterator __result_first, |
| 1698 | _RandomAccessIterator __result_last) |
| 1699 | { |
| 1700 | #ifdef _GLIBCXX_CONCEPT_CHECKS |
| 1701 | typedef typename iterator_traits<_InputIterator>::value_type |
| 1702 | _InputValueType; |
| 1703 | typedef typename iterator_traits<_RandomAccessIterator>::value_type |
| 1704 | _OutputValueType; |
| 1705 | #endif |
| 1706 | |
| 1707 | // concept requirements |
| 1708 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 1709 | __glibcxx_function_requires(_ConvertibleConcept<_InputValueType, |
| 1710 | _OutputValueType>) |
| 1711 | __glibcxx_function_requires(_LessThanOpConcept<_InputValueType, |
| 1712 | _OutputValueType>) |
| 1713 | __glibcxx_function_requires(_LessThanComparableConcept<_OutputValueType>) |
| 1714 | __glibcxx_requires_valid_range(__first, __last); |
| 1715 | __glibcxx_requires_irreflexive(__first, __last); |
| 1716 | __glibcxx_requires_valid_range(__result_first, __result_last); |
| 1717 | |
| 1718 | return std::__partial_sort_copy(__first, __last, |
| 1719 | __result_first, __result_last, |
| 1720 | __gnu_cxx::__ops::__iter_less_iter()); |
| 1721 | } |
| 1722 | |
| 1723 | /** |
| 1724 | * @brief Copy the smallest elements of a sequence using a predicate for |
| 1725 | * comparison. |
| 1726 | * @ingroup sorting_algorithms |
| 1727 | * @param __first An input iterator. |
| 1728 | * @param __last Another input iterator. |
| 1729 | * @param __result_first A random-access iterator. |
| 1730 | * @param __result_last Another random-access iterator. |
| 1731 | * @param __comp A comparison functor. |
| 1732 | * @return An iterator indicating the end of the resulting sequence. |
| 1733 | * |
| 1734 | * Copies and sorts the smallest N values from the range @p [__first,__last) |
| 1735 | * to the range beginning at @p result_first, where the number of |
| 1736 | * elements to be copied, @p N, is the smaller of @p (__last-__first) and |
| 1737 | * @p (__result_last-__result_first). |
| 1738 | * After the sort if @e i and @e j are iterators in the range |
| 1739 | * @p [__result_first,__result_first+N) such that i precedes j then |
| 1740 | * @p __comp(*j,*i) is false. |
| 1741 | * The value returned is @p __result_first+N. |
| 1742 | */ |
| 1743 | template<typename _InputIterator, typename _RandomAccessIterator, |
| 1744 | typename _Compare> |
| 1745 | _GLIBCXX20_CONSTEXPR |
| 1746 | inline _RandomAccessIterator |
| 1747 | partial_sort_copy(_InputIterator __first, _InputIterator __last, |
| 1748 | _RandomAccessIterator __result_first, |
| 1749 | _RandomAccessIterator __result_last, |
| 1750 | _Compare __comp) |
| 1751 | { |
| 1752 | #ifdef _GLIBCXX_CONCEPT_CHECKS |
| 1753 | typedef typename iterator_traits<_InputIterator>::value_type |
| 1754 | _InputValueType; |
| 1755 | typedef typename iterator_traits<_RandomAccessIterator>::value_type |
| 1756 | _OutputValueType; |
| 1757 | #endif |
| 1758 | |
| 1759 | // concept requirements |
| 1760 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 1761 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 1762 | _RandomAccessIterator>) |
| 1763 | __glibcxx_function_requires(_ConvertibleConcept<_InputValueType, |
| 1764 | _OutputValueType>) |
| 1765 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 1766 | _InputValueType, _OutputValueType>) |
| 1767 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 1768 | _OutputValueType, _OutputValueType>) |
| 1769 | __glibcxx_requires_valid_range(__first, __last); |
| 1770 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 1771 | __glibcxx_requires_valid_range(__result_first, __result_last); |
| 1772 | |
| 1773 | return std::__partial_sort_copy(__first, __last, |
| 1774 | __result_first, __result_last, |
| 1775 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 1776 | } |
| 1777 | |
| 1778 | /// This is a helper function for the sort routine. |
| 1779 | template<typename _RandomAccessIterator, typename _Compare> |
| 1780 | _GLIBCXX20_CONSTEXPR |
| 1781 | void |
| 1782 | __unguarded_linear_insert(_RandomAccessIterator __last, |
| 1783 | _Compare __comp) |
| 1784 | { |
| 1785 | typename iterator_traits<_RandomAccessIterator>::value_type |
| 1786 | __val = _GLIBCXX_MOVE(*__last); |
| 1787 | _RandomAccessIterator __next = __last; |
| 1788 | --__next; |
| 1789 | while (__comp(__val, __next)) |
| 1790 | { |
| 1791 | *__last = _GLIBCXX_MOVE(*__next); |
| 1792 | __last = __next; |
| 1793 | --__next; |
| 1794 | } |
| 1795 | *__last = _GLIBCXX_MOVE(__val); |
| 1796 | } |
| 1797 | |
| 1798 | /// This is a helper function for the sort routine. |
| 1799 | template<typename _RandomAccessIterator, typename _Compare> |
| 1800 | _GLIBCXX20_CONSTEXPR |
| 1801 | void |
| 1802 | __insertion_sort(_RandomAccessIterator __first, |
| 1803 | _RandomAccessIterator __last, _Compare __comp) |
| 1804 | { |
| 1805 | if (__first == __last) return; |
| 1806 | |
| 1807 | for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) |
| 1808 | { |
| 1809 | if (__comp(__i, __first)) |
| 1810 | { |
| 1811 | typename iterator_traits<_RandomAccessIterator>::value_type |
| 1812 | __val = _GLIBCXX_MOVE(*__i); |
| 1813 | _GLIBCXX_MOVE_BACKWARD3(__first, __i, __i + 1); |
| 1814 | *__first = _GLIBCXX_MOVE(__val); |
| 1815 | } |
| 1816 | else |
| 1817 | std::__unguarded_linear_insert(__i, |
| 1818 | __gnu_cxx::__ops::__val_comp_iter(__comp)); |
| 1819 | } |
| 1820 | } |
| 1821 | |
| 1822 | /// This is a helper function for the sort routine. |
| 1823 | template<typename _RandomAccessIterator, typename _Compare> |
| 1824 | _GLIBCXX20_CONSTEXPR |
| 1825 | inline void |
| 1826 | __unguarded_insertion_sort(_RandomAccessIterator __first, |
| 1827 | _RandomAccessIterator __last, _Compare __comp) |
| 1828 | { |
| 1829 | for (_RandomAccessIterator __i = __first; __i != __last; ++__i) |
| 1830 | std::__unguarded_linear_insert(__i, |
| 1831 | __gnu_cxx::__ops::__val_comp_iter(__comp)); |
| 1832 | } |
| 1833 | |
| 1834 | /** |
| 1835 | * @doctodo |
| 1836 | * This controls some aspect of the sort routines. |
| 1837 | */ |
| 1838 | enum { _S_threshold = 16 }; |
| 1839 | |
| 1840 | /// This is a helper function for the sort routine. |
| 1841 | template<typename _RandomAccessIterator, typename _Compare> |
| 1842 | _GLIBCXX20_CONSTEXPR |
| 1843 | void |
| 1844 | __final_insertion_sort(_RandomAccessIterator __first, |
| 1845 | _RandomAccessIterator __last, _Compare __comp) |
| 1846 | { |
| 1847 | if (__last - __first > int(_S_threshold)) |
| 1848 | { |
| 1849 | std::__insertion_sort(__first, __first + int(_S_threshold), __comp); |
| 1850 | std::__unguarded_insertion_sort(__first + int(_S_threshold), __last, |
| 1851 | __comp); |
| 1852 | } |
| 1853 | else |
| 1854 | std::__insertion_sort(__first, __last, __comp); |
| 1855 | } |
| 1856 | |
| 1857 | /// This is a helper function... |
| 1858 | template<typename _RandomAccessIterator, typename _Compare> |
| 1859 | _GLIBCXX20_CONSTEXPR |
| 1860 | _RandomAccessIterator |
| 1861 | __unguarded_partition(_RandomAccessIterator __first, |
| 1862 | _RandomAccessIterator __last, |
| 1863 | _RandomAccessIterator __pivot, _Compare __comp) |
| 1864 | { |
| 1865 | while (true) |
| 1866 | { |
| 1867 | while (__comp(__first, __pivot)) |
| 1868 | ++__first; |
| 1869 | --__last; |
| 1870 | while (__comp(__pivot, __last)) |
| 1871 | --__last; |
| 1872 | if (!(__first < __last)) |
| 1873 | return __first; |
| 1874 | std::iter_swap(__first, __last); |
| 1875 | ++__first; |
| 1876 | } |
| 1877 | } |
| 1878 | |
| 1879 | /// This is a helper function... |
| 1880 | template<typename _RandomAccessIterator, typename _Compare> |
| 1881 | _GLIBCXX20_CONSTEXPR |
| 1882 | inline _RandomAccessIterator |
| 1883 | __unguarded_partition_pivot(_RandomAccessIterator __first, |
| 1884 | _RandomAccessIterator __last, _Compare __comp) |
| 1885 | { |
| 1886 | _RandomAccessIterator __mid = __first + (__last - __first) / 2; |
| 1887 | std::__move_median_to_first(__first, __first + 1, __mid, __last - 1, |
| 1888 | __comp); |
| 1889 | return std::__unguarded_partition(__first + 1, __last, __first, __comp); |
| 1890 | } |
| 1891 | |
| 1892 | template<typename _RandomAccessIterator, typename _Compare> |
| 1893 | _GLIBCXX20_CONSTEXPR |
| 1894 | inline void |
| 1895 | __partial_sort(_RandomAccessIterator __first, |
| 1896 | _RandomAccessIterator __middle, |
| 1897 | _RandomAccessIterator __last, |
| 1898 | _Compare __comp) |
| 1899 | { |
| 1900 | std::__heap_select(__first, __middle, __last, __comp); |
| 1901 | std::__sort_heap(__first, __middle, __comp); |
| 1902 | } |
| 1903 | |
| 1904 | /// This is a helper function for the sort routine. |
| 1905 | template<typename _RandomAccessIterator, typename _Size, typename _Compare> |
| 1906 | _GLIBCXX20_CONSTEXPR |
| 1907 | void |
| 1908 | __introsort_loop(_RandomAccessIterator __first, |
| 1909 | _RandomAccessIterator __last, |
| 1910 | _Size __depth_limit, _Compare __comp) |
| 1911 | { |
| 1912 | while (__last - __first > int(_S_threshold)) |
| 1913 | { |
| 1914 | if (__depth_limit == 0) |
| 1915 | { |
| 1916 | std::__partial_sort(__first, __last, __last, __comp); |
| 1917 | return; |
| 1918 | } |
| 1919 | --__depth_limit; |
| 1920 | _RandomAccessIterator __cut = |
| 1921 | std::__unguarded_partition_pivot(__first, __last, __comp); |
| 1922 | std::__introsort_loop(__cut, __last, __depth_limit, __comp); |
| 1923 | __last = __cut; |
| 1924 | } |
| 1925 | } |
| 1926 | |
| 1927 | // sort |
| 1928 | |
| 1929 | template<typename _RandomAccessIterator, typename _Compare> |
| 1930 | _GLIBCXX20_CONSTEXPR |
| 1931 | inline void |
| 1932 | __sort(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 1933 | _Compare __comp) |
| 1934 | { |
| 1935 | if (__first != __last) |
| 1936 | { |
| 1937 | std::__introsort_loop(__first, __last, |
| 1938 | std::__lg(__last - __first) * 2, |
| 1939 | __comp); |
| 1940 | std::__final_insertion_sort(__first, __last, __comp); |
| 1941 | } |
| 1942 | } |
| 1943 | |
| 1944 | template<typename _RandomAccessIterator, typename _Size, typename _Compare> |
| 1945 | _GLIBCXX20_CONSTEXPR |
| 1946 | void |
| 1947 | __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth, |
| 1948 | _RandomAccessIterator __last, _Size __depth_limit, |
| 1949 | _Compare __comp) |
| 1950 | { |
| 1951 | while (__last - __first > 3) |
| 1952 | { |
| 1953 | if (__depth_limit == 0) |
| 1954 | { |
| 1955 | std::__heap_select(__first, __nth + 1, __last, __comp); |
| 1956 | // Place the nth largest element in its final position. |
| 1957 | std::iter_swap(__first, __nth); |
| 1958 | return; |
| 1959 | } |
| 1960 | --__depth_limit; |
| 1961 | _RandomAccessIterator __cut = |
| 1962 | std::__unguarded_partition_pivot(__first, __last, __comp); |
| 1963 | if (__cut <= __nth) |
| 1964 | __first = __cut; |
| 1965 | else |
| 1966 | __last = __cut; |
| 1967 | } |
| 1968 | std::__insertion_sort(__first, __last, __comp); |
| 1969 | } |
| 1970 | |
| 1971 | // nth_element |
| 1972 | |
| 1973 | // lower_bound moved to stl_algobase.h |
| 1974 | |
| 1975 | /** |
| 1976 | * @brief Finds the first position in which @p __val could be inserted |
| 1977 | * without changing the ordering. |
| 1978 | * @ingroup binary_search_algorithms |
| 1979 | * @param __first An iterator. |
| 1980 | * @param __last Another iterator. |
| 1981 | * @param __val The search term. |
| 1982 | * @param __comp A functor to use for comparisons. |
| 1983 | * @return An iterator pointing to the first element <em>not less |
| 1984 | * than</em> @p __val, or end() if every element is less |
| 1985 | * than @p __val. |
| 1986 | * @ingroup binary_search_algorithms |
| 1987 | * |
| 1988 | * The comparison function should have the same effects on ordering as |
| 1989 | * the function used for the initial sort. |
| 1990 | */ |
| 1991 | template<typename _ForwardIterator, typename _Tp, typename _Compare> |
| 1992 | _GLIBCXX20_CONSTEXPR |
| 1993 | inline _ForwardIterator |
| 1994 | lower_bound(_ForwardIterator __first, _ForwardIterator __last, |
| 1995 | const _Tp& __val, _Compare __comp) |
| 1996 | { |
| 1997 | // concept requirements |
| 1998 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 1999 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2000 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 2001 | __glibcxx_requires_partitioned_lower_pred(__first, __last, |
| 2002 | __val, __comp); |
| 2003 | |
| 2004 | return std::__lower_bound(__first, __last, __val, |
| 2005 | __gnu_cxx::__ops::__iter_comp_val(__comp)); |
| 2006 | } |
| 2007 | |
| 2008 | template<typename _ForwardIterator, typename _Tp, typename _Compare> |
| 2009 | _GLIBCXX20_CONSTEXPR |
| 2010 | _ForwardIterator |
| 2011 | __upper_bound(_ForwardIterator __first, _ForwardIterator __last, |
| 2012 | const _Tp& __val, _Compare __comp) |
| 2013 | { |
| 2014 | typedef typename iterator_traits<_ForwardIterator>::difference_type |
| 2015 | _DistanceType; |
| 2016 | |
| 2017 | _DistanceType __len = std::distance(__first, __last); |
| 2018 | |
| 2019 | while (__len > 0) |
| 2020 | { |
| 2021 | _DistanceType __half = __len >> 1; |
| 2022 | _ForwardIterator __middle = __first; |
| 2023 | std::advance(__middle, __half); |
| 2024 | if (__comp(__val, __middle)) |
| 2025 | __len = __half; |
| 2026 | else |
| 2027 | { |
| 2028 | __first = __middle; |
| 2029 | ++__first; |
| 2030 | __len = __len - __half - 1; |
| 2031 | } |
| 2032 | } |
| 2033 | return __first; |
| 2034 | } |
| 2035 | |
| 2036 | /** |
| 2037 | * @brief Finds the last position in which @p __val could be inserted |
| 2038 | * without changing the ordering. |
| 2039 | * @ingroup binary_search_algorithms |
| 2040 | * @param __first An iterator. |
| 2041 | * @param __last Another iterator. |
| 2042 | * @param __val The search term. |
| 2043 | * @return An iterator pointing to the first element greater than @p __val, |
| 2044 | * or end() if no elements are greater than @p __val. |
| 2045 | * @ingroup binary_search_algorithms |
| 2046 | */ |
| 2047 | template<typename _ForwardIterator, typename _Tp> |
| 2048 | _GLIBCXX20_CONSTEXPR |
| 2049 | inline _ForwardIterator |
| 2050 | upper_bound(_ForwardIterator __first, _ForwardIterator __last, |
| 2051 | const _Tp& __val) |
| 2052 | { |
| 2053 | // concept requirements |
| 2054 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 2055 | __glibcxx_function_requires(_LessThanOpConcept< |
| 2056 | _Tp, typename iterator_traits<_ForwardIterator>::value_type>) |
| 2057 | __glibcxx_requires_partitioned_upper(__first, __last, __val); |
| 2058 | |
| 2059 | return std::__upper_bound(__first, __last, __val, |
| 2060 | __gnu_cxx::__ops::__val_less_iter()); |
| 2061 | } |
| 2062 | |
| 2063 | /** |
| 2064 | * @brief Finds the last position in which @p __val could be inserted |
| 2065 | * without changing the ordering. |
| 2066 | * @ingroup binary_search_algorithms |
| 2067 | * @param __first An iterator. |
| 2068 | * @param __last Another iterator. |
| 2069 | * @param __val The search term. |
| 2070 | * @param __comp A functor to use for comparisons. |
| 2071 | * @return An iterator pointing to the first element greater than @p __val, |
| 2072 | * or end() if no elements are greater than @p __val. |
| 2073 | * @ingroup binary_search_algorithms |
| 2074 | * |
| 2075 | * The comparison function should have the same effects on ordering as |
| 2076 | * the function used for the initial sort. |
| 2077 | */ |
| 2078 | template<typename _ForwardIterator, typename _Tp, typename _Compare> |
| 2079 | _GLIBCXX20_CONSTEXPR |
| 2080 | inline _ForwardIterator |
| 2081 | upper_bound(_ForwardIterator __first, _ForwardIterator __last, |
| 2082 | const _Tp& __val, _Compare __comp) |
| 2083 | { |
| 2084 | // concept requirements |
| 2085 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 2086 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2087 | _Tp, typename iterator_traits<_ForwardIterator>::value_type>) |
| 2088 | __glibcxx_requires_partitioned_upper_pred(__first, __last, |
| 2089 | __val, __comp); |
| 2090 | |
| 2091 | return std::__upper_bound(__first, __last, __val, |
| 2092 | __gnu_cxx::__ops::__val_comp_iter(__comp)); |
| 2093 | } |
| 2094 | |
| 2095 | template<typename _ForwardIterator, typename _Tp, |
| 2096 | typename _CompareItTp, typename _CompareTpIt> |
| 2097 | _GLIBCXX20_CONSTEXPR |
| 2098 | pair<_ForwardIterator, _ForwardIterator> |
| 2099 | __equal_range(_ForwardIterator __first, _ForwardIterator __last, |
| 2100 | const _Tp& __val, |
| 2101 | _CompareItTp __comp_it_val, _CompareTpIt __comp_val_it) |
| 2102 | { |
| 2103 | typedef typename iterator_traits<_ForwardIterator>::difference_type |
| 2104 | _DistanceType; |
| 2105 | |
| 2106 | _DistanceType __len = std::distance(__first, __last); |
| 2107 | |
| 2108 | while (__len > 0) |
| 2109 | { |
| 2110 | _DistanceType __half = __len >> 1; |
| 2111 | _ForwardIterator __middle = __first; |
| 2112 | std::advance(__middle, __half); |
| 2113 | if (__comp_it_val(__middle, __val)) |
| 2114 | { |
| 2115 | __first = __middle; |
| 2116 | ++__first; |
| 2117 | __len = __len - __half - 1; |
| 2118 | } |
| 2119 | else if (__comp_val_it(__val, __middle)) |
| 2120 | __len = __half; |
| 2121 | else |
| 2122 | { |
| 2123 | _ForwardIterator __left |
| 2124 | = std::__lower_bound(__first, __middle, __val, __comp_it_val); |
| 2125 | std::advance(__first, __len); |
| 2126 | _ForwardIterator __right |
| 2127 | = std::__upper_bound(++__middle, __first, __val, __comp_val_it); |
| 2128 | return pair<_ForwardIterator, _ForwardIterator>(__left, __right); |
| 2129 | } |
| 2130 | } |
| 2131 | return pair<_ForwardIterator, _ForwardIterator>(__first, __first); |
| 2132 | } |
| 2133 | |
| 2134 | /** |
| 2135 | * @brief Finds the largest subrange in which @p __val could be inserted |
| 2136 | * at any place in it without changing the ordering. |
| 2137 | * @ingroup binary_search_algorithms |
| 2138 | * @param __first An iterator. |
| 2139 | * @param __last Another iterator. |
| 2140 | * @param __val The search term. |
| 2141 | * @return An pair of iterators defining the subrange. |
| 2142 | * @ingroup binary_search_algorithms |
| 2143 | * |
| 2144 | * This is equivalent to |
| 2145 | * @code |
| 2146 | * std::make_pair(lower_bound(__first, __last, __val), |
| 2147 | * upper_bound(__first, __last, __val)) |
| 2148 | * @endcode |
| 2149 | * but does not actually call those functions. |
| 2150 | */ |
| 2151 | template<typename _ForwardIterator, typename _Tp> |
| 2152 | _GLIBCXX20_CONSTEXPR |
| 2153 | inline pair<_ForwardIterator, _ForwardIterator> |
| 2154 | equal_range(_ForwardIterator __first, _ForwardIterator __last, |
| 2155 | const _Tp& __val) |
| 2156 | { |
| 2157 | // concept requirements |
| 2158 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 2159 | __glibcxx_function_requires(_LessThanOpConcept< |
| 2160 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 2161 | __glibcxx_function_requires(_LessThanOpConcept< |
| 2162 | _Tp, typename iterator_traits<_ForwardIterator>::value_type>) |
| 2163 | __glibcxx_requires_partitioned_lower(__first, __last, __val); |
| 2164 | __glibcxx_requires_partitioned_upper(__first, __last, __val); |
| 2165 | |
| 2166 | return std::__equal_range(__first, __last, __val, |
| 2167 | __gnu_cxx::__ops::__iter_less_val(), |
| 2168 | __gnu_cxx::__ops::__val_less_iter()); |
| 2169 | } |
| 2170 | |
| 2171 | /** |
| 2172 | * @brief Finds the largest subrange in which @p __val could be inserted |
| 2173 | * at any place in it without changing the ordering. |
| 2174 | * @param __first An iterator. |
| 2175 | * @param __last Another iterator. |
| 2176 | * @param __val The search term. |
| 2177 | * @param __comp A functor to use for comparisons. |
| 2178 | * @return An pair of iterators defining the subrange. |
| 2179 | * @ingroup binary_search_algorithms |
| 2180 | * |
| 2181 | * This is equivalent to |
| 2182 | * @code |
| 2183 | * std::make_pair(lower_bound(__first, __last, __val, __comp), |
| 2184 | * upper_bound(__first, __last, __val, __comp)) |
| 2185 | * @endcode |
| 2186 | * but does not actually call those functions. |
| 2187 | */ |
| 2188 | template<typename _ForwardIterator, typename _Tp, typename _Compare> |
| 2189 | _GLIBCXX20_CONSTEXPR |
| 2190 | inline pair<_ForwardIterator, _ForwardIterator> |
| 2191 | equal_range(_ForwardIterator __first, _ForwardIterator __last, |
| 2192 | const _Tp& __val, _Compare __comp) |
| 2193 | { |
| 2194 | // concept requirements |
| 2195 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 2196 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2197 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 2198 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2199 | _Tp, typename iterator_traits<_ForwardIterator>::value_type>) |
| 2200 | __glibcxx_requires_partitioned_lower_pred(__first, __last, |
| 2201 | __val, __comp); |
| 2202 | __glibcxx_requires_partitioned_upper_pred(__first, __last, |
| 2203 | __val, __comp); |
| 2204 | |
| 2205 | return std::__equal_range(__first, __last, __val, |
| 2206 | __gnu_cxx::__ops::__iter_comp_val(__comp), |
| 2207 | __gnu_cxx::__ops::__val_comp_iter(__comp)); |
| 2208 | } |
| 2209 | |
| 2210 | /** |
| 2211 | * @brief Determines whether an element exists in a range. |
| 2212 | * @ingroup binary_search_algorithms |
| 2213 | * @param __first An iterator. |
| 2214 | * @param __last Another iterator. |
| 2215 | * @param __val The search term. |
| 2216 | * @return True if @p __val (or its equivalent) is in [@p |
| 2217 | * __first,@p __last ]. |
| 2218 | * |
| 2219 | * Note that this does not actually return an iterator to @p __val. For |
| 2220 | * that, use std::find or a container's specialized find member functions. |
| 2221 | */ |
| 2222 | template<typename _ForwardIterator, typename _Tp> |
| 2223 | _GLIBCXX20_CONSTEXPR |
| 2224 | bool |
| 2225 | binary_search(_ForwardIterator __first, _ForwardIterator __last, |
| 2226 | const _Tp& __val) |
| 2227 | { |
| 2228 | // concept requirements |
| 2229 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 2230 | __glibcxx_function_requires(_LessThanOpConcept< |
| 2231 | _Tp, typename iterator_traits<_ForwardIterator>::value_type>) |
| 2232 | __glibcxx_requires_partitioned_lower(__first, __last, __val); |
| 2233 | __glibcxx_requires_partitioned_upper(__first, __last, __val); |
| 2234 | |
| 2235 | _ForwardIterator __i |
| 2236 | = std::__lower_bound(__first, __last, __val, |
| 2237 | __gnu_cxx::__ops::__iter_less_val()); |
| 2238 | return __i != __last && !(__val < *__i); |
| 2239 | } |
| 2240 | |
| 2241 | /** |
| 2242 | * @brief Determines whether an element exists in a range. |
| 2243 | * @ingroup binary_search_algorithms |
| 2244 | * @param __first An iterator. |
| 2245 | * @param __last Another iterator. |
| 2246 | * @param __val The search term. |
| 2247 | * @param __comp A functor to use for comparisons. |
| 2248 | * @return True if @p __val (or its equivalent) is in @p [__first,__last]. |
| 2249 | * |
| 2250 | * Note that this does not actually return an iterator to @p __val. For |
| 2251 | * that, use std::find or a container's specialized find member functions. |
| 2252 | * |
| 2253 | * The comparison function should have the same effects on ordering as |
| 2254 | * the function used for the initial sort. |
| 2255 | */ |
| 2256 | template<typename _ForwardIterator, typename _Tp, typename _Compare> |
| 2257 | _GLIBCXX20_CONSTEXPR |
| 2258 | bool |
| 2259 | binary_search(_ForwardIterator __first, _ForwardIterator __last, |
| 2260 | const _Tp& __val, _Compare __comp) |
| 2261 | { |
| 2262 | // concept requirements |
| 2263 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 2264 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2265 | _Tp, typename iterator_traits<_ForwardIterator>::value_type>) |
| 2266 | __glibcxx_requires_partitioned_lower_pred(__first, __last, |
| 2267 | __val, __comp); |
| 2268 | __glibcxx_requires_partitioned_upper_pred(__first, __last, |
| 2269 | __val, __comp); |
| 2270 | |
| 2271 | _ForwardIterator __i |
| 2272 | = std::__lower_bound(__first, __last, __val, |
| 2273 | __gnu_cxx::__ops::__iter_comp_val(__comp)); |
| 2274 | return __i != __last && !bool(__comp(__val, *__i)); |
| 2275 | } |
| 2276 | |
| 2277 | // merge |
| 2278 | |
| 2279 | /// This is a helper function for the __merge_adaptive routines. |
| 2280 | template<typename _InputIterator1, typename _InputIterator2, |
| 2281 | typename _OutputIterator, typename _Compare> |
| 2282 | void |
| 2283 | __move_merge_adaptive(_InputIterator1 __first1, _InputIterator1 __last1, |
| 2284 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 2285 | _OutputIterator __result, _Compare __comp) |
| 2286 | { |
| 2287 | while (__first1 != __last1 && __first2 != __last2) |
| 2288 | { |
| 2289 | if (__comp(__first2, __first1)) |
| 2290 | { |
| 2291 | *__result = _GLIBCXX_MOVE(*__first2); |
| 2292 | ++__first2; |
| 2293 | } |
| 2294 | else |
| 2295 | { |
| 2296 | *__result = _GLIBCXX_MOVE(*__first1); |
| 2297 | ++__first1; |
| 2298 | } |
| 2299 | ++__result; |
| 2300 | } |
| 2301 | if (__first1 != __last1) |
| 2302 | _GLIBCXX_MOVE3(__first1, __last1, __result); |
| 2303 | } |
| 2304 | |
| 2305 | /// This is a helper function for the __merge_adaptive routines. |
| 2306 | template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, |
| 2307 | typename _BidirectionalIterator3, typename _Compare> |
| 2308 | void |
| 2309 | __move_merge_adaptive_backward(_BidirectionalIterator1 __first1, |
| 2310 | _BidirectionalIterator1 __last1, |
| 2311 | _BidirectionalIterator2 __first2, |
| 2312 | _BidirectionalIterator2 __last2, |
| 2313 | _BidirectionalIterator3 __result, |
| 2314 | _Compare __comp) |
| 2315 | { |
| 2316 | if (__first1 == __last1) |
| 2317 | { |
| 2318 | _GLIBCXX_MOVE_BACKWARD3(__first2, __last2, __result); |
| 2319 | return; |
| 2320 | } |
| 2321 | else if (__first2 == __last2) |
| 2322 | return; |
| 2323 | |
| 2324 | --__last1; |
| 2325 | --__last2; |
| 2326 | while (true) |
| 2327 | { |
| 2328 | if (__comp(__last2, __last1)) |
| 2329 | { |
| 2330 | *--__result = _GLIBCXX_MOVE(*__last1); |
| 2331 | if (__first1 == __last1) |
| 2332 | { |
| 2333 | _GLIBCXX_MOVE_BACKWARD3(__first2, ++__last2, __result); |
| 2334 | return; |
| 2335 | } |
| 2336 | --__last1; |
| 2337 | } |
| 2338 | else |
| 2339 | { |
| 2340 | *--__result = _GLIBCXX_MOVE(*__last2); |
| 2341 | if (__first2 == __last2) |
| 2342 | return; |
| 2343 | --__last2; |
| 2344 | } |
| 2345 | } |
| 2346 | } |
| 2347 | |
| 2348 | /// This is a helper function for the merge routines. |
| 2349 | template<typename _BidirectionalIterator1, typename _BidirectionalIterator2, |
| 2350 | typename _Distance> |
| 2351 | _BidirectionalIterator1 |
| 2352 | __rotate_adaptive(_BidirectionalIterator1 __first, |
| 2353 | _BidirectionalIterator1 __middle, |
| 2354 | _BidirectionalIterator1 __last, |
| 2355 | _Distance __len1, _Distance __len2, |
| 2356 | _BidirectionalIterator2 __buffer, |
| 2357 | _Distance __buffer_size) |
| 2358 | { |
| 2359 | _BidirectionalIterator2 __buffer_end; |
| 2360 | if (__len1 > __len2 && __len2 <= __buffer_size) |
| 2361 | { |
| 2362 | if (__len2) |
| 2363 | { |
| 2364 | __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer); |
| 2365 | _GLIBCXX_MOVE_BACKWARD3(__first, __middle, __last); |
| 2366 | return _GLIBCXX_MOVE3(__buffer, __buffer_end, __first); |
| 2367 | } |
| 2368 | else |
| 2369 | return __first; |
| 2370 | } |
| 2371 | else if (__len1 <= __buffer_size) |
| 2372 | { |
| 2373 | if (__len1) |
| 2374 | { |
| 2375 | __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer); |
| 2376 | _GLIBCXX_MOVE3(__middle, __last, __first); |
| 2377 | return _GLIBCXX_MOVE_BACKWARD3(__buffer, __buffer_end, __last); |
| 2378 | } |
| 2379 | else |
| 2380 | return __last; |
| 2381 | } |
| 2382 | else |
| 2383 | return std::rotate(__first, __middle, __last); |
| 2384 | } |
| 2385 | |
| 2386 | /// This is a helper function for the merge routines. |
| 2387 | template<typename _BidirectionalIterator, typename _Distance, |
| 2388 | typename _Pointer, typename _Compare> |
| 2389 | void |
| 2390 | __merge_adaptive(_BidirectionalIterator __first, |
| 2391 | _BidirectionalIterator __middle, |
| 2392 | _BidirectionalIterator __last, |
| 2393 | _Distance __len1, _Distance __len2, |
| 2394 | _Pointer __buffer, _Distance __buffer_size, |
| 2395 | _Compare __comp) |
| 2396 | { |
| 2397 | if (__len1 <= __len2 && __len1 <= __buffer_size) |
| 2398 | { |
| 2399 | _Pointer __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer); |
| 2400 | std::__move_merge_adaptive(__buffer, __buffer_end, __middle, __last, |
| 2401 | __first, __comp); |
| 2402 | } |
| 2403 | else if (__len2 <= __buffer_size) |
| 2404 | { |
| 2405 | _Pointer __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer); |
| 2406 | std::__move_merge_adaptive_backward(__first, __middle, __buffer, |
| 2407 | __buffer_end, __last, __comp); |
| 2408 | } |
| 2409 | else |
| 2410 | { |
| 2411 | _BidirectionalIterator __first_cut = __first; |
| 2412 | _BidirectionalIterator __second_cut = __middle; |
| 2413 | _Distance __len11 = 0; |
| 2414 | _Distance __len22 = 0; |
| 2415 | if (__len1 > __len2) |
| 2416 | { |
| 2417 | __len11 = __len1 / 2; |
| 2418 | std::advance(__first_cut, __len11); |
| 2419 | __second_cut |
| 2420 | = std::__lower_bound(__middle, __last, *__first_cut, |
| 2421 | __gnu_cxx::__ops::__iter_comp_val(__comp)); |
| 2422 | __len22 = std::distance(__middle, __second_cut); |
| 2423 | } |
| 2424 | else |
| 2425 | { |
| 2426 | __len22 = __len2 / 2; |
| 2427 | std::advance(__second_cut, __len22); |
| 2428 | __first_cut |
| 2429 | = std::__upper_bound(__first, __middle, *__second_cut, |
| 2430 | __gnu_cxx::__ops::__val_comp_iter(__comp)); |
| 2431 | __len11 = std::distance(__first, __first_cut); |
| 2432 | } |
| 2433 | |
| 2434 | _BidirectionalIterator __new_middle |
| 2435 | = std::__rotate_adaptive(__first_cut, __middle, __second_cut, |
| 2436 | __len1 - __len11, __len22, __buffer, |
| 2437 | __buffer_size); |
| 2438 | std::__merge_adaptive(__first, __first_cut, __new_middle, __len11, |
| 2439 | __len22, __buffer, __buffer_size, __comp); |
| 2440 | std::__merge_adaptive(__new_middle, __second_cut, __last, |
| 2441 | __len1 - __len11, |
| 2442 | __len2 - __len22, __buffer, |
| 2443 | __buffer_size, __comp); |
| 2444 | } |
| 2445 | } |
| 2446 | |
| 2447 | /// This is a helper function for the merge routines. |
| 2448 | template<typename _BidirectionalIterator, typename _Distance, |
| 2449 | typename _Compare> |
| 2450 | void |
| 2451 | __merge_without_buffer(_BidirectionalIterator __first, |
| 2452 | _BidirectionalIterator __middle, |
| 2453 | _BidirectionalIterator __last, |
| 2454 | _Distance __len1, _Distance __len2, |
| 2455 | _Compare __comp) |
| 2456 | { |
| 2457 | if (__len1 == 0 || __len2 == 0) |
| 2458 | return; |
| 2459 | |
| 2460 | if (__len1 + __len2 == 2) |
| 2461 | { |
| 2462 | if (__comp(__middle, __first)) |
| 2463 | std::iter_swap(__first, __middle); |
| 2464 | return; |
| 2465 | } |
| 2466 | |
| 2467 | _BidirectionalIterator __first_cut = __first; |
| 2468 | _BidirectionalIterator __second_cut = __middle; |
| 2469 | _Distance __len11 = 0; |
| 2470 | _Distance __len22 = 0; |
| 2471 | if (__len1 > __len2) |
| 2472 | { |
| 2473 | __len11 = __len1 / 2; |
| 2474 | std::advance(__first_cut, __len11); |
| 2475 | __second_cut |
| 2476 | = std::__lower_bound(__middle, __last, *__first_cut, |
| 2477 | __gnu_cxx::__ops::__iter_comp_val(__comp)); |
| 2478 | __len22 = std::distance(__middle, __second_cut); |
| 2479 | } |
| 2480 | else |
| 2481 | { |
| 2482 | __len22 = __len2 / 2; |
| 2483 | std::advance(__second_cut, __len22); |
| 2484 | __first_cut |
| 2485 | = std::__upper_bound(__first, __middle, *__second_cut, |
| 2486 | __gnu_cxx::__ops::__val_comp_iter(__comp)); |
| 2487 | __len11 = std::distance(__first, __first_cut); |
| 2488 | } |
| 2489 | |
| 2490 | _BidirectionalIterator __new_middle |
| 2491 | = std::rotate(__first_cut, __middle, __second_cut); |
| 2492 | std::__merge_without_buffer(__first, __first_cut, __new_middle, |
| 2493 | __len11, __len22, __comp); |
| 2494 | std::__merge_without_buffer(__new_middle, __second_cut, __last, |
| 2495 | __len1 - __len11, __len2 - __len22, __comp); |
| 2496 | } |
| 2497 | |
| 2498 | template<typename _BidirectionalIterator, typename _Compare> |
| 2499 | void |
| 2500 | __inplace_merge(_BidirectionalIterator __first, |
| 2501 | _BidirectionalIterator __middle, |
| 2502 | _BidirectionalIterator __last, |
| 2503 | _Compare __comp) |
| 2504 | { |
| 2505 | typedef typename iterator_traits<_BidirectionalIterator>::value_type |
| 2506 | _ValueType; |
| 2507 | typedef typename iterator_traits<_BidirectionalIterator>::difference_type |
| 2508 | _DistanceType; |
| 2509 | typedef _Temporary_buffer<_BidirectionalIterator, _ValueType> _TmpBuf; |
| 2510 | |
| 2511 | if (__first == __middle || __middle == __last) |
| 2512 | return; |
| 2513 | |
| 2514 | const _DistanceType __len1 = std::distance(__first, __middle); |
| 2515 | const _DistanceType __len2 = std::distance(__middle, __last); |
| 2516 | |
| 2517 | // __merge_adaptive will use a buffer for the smaller of |
| 2518 | // [first,middle) and [middle,last). |
| 2519 | _TmpBuf __buf(__first, std::min(__len1, __len2)); |
| 2520 | |
| 2521 | if (__buf.begin() == 0) |
| 2522 | std::__merge_without_buffer |
| 2523 | (__first, __middle, __last, __len1, __len2, __comp); |
| 2524 | else |
| 2525 | std::__merge_adaptive |
| 2526 | (__first, __middle, __last, __len1, __len2, __buf.begin(), |
| 2527 | _DistanceType(__buf.size()), __comp); |
| 2528 | } |
| 2529 | |
| 2530 | /** |
| 2531 | * @brief Merges two sorted ranges in place. |
| 2532 | * @ingroup sorting_algorithms |
| 2533 | * @param __first An iterator. |
| 2534 | * @param __middle Another iterator. |
| 2535 | * @param __last Another iterator. |
| 2536 | * @return Nothing. |
| 2537 | * |
| 2538 | * Merges two sorted and consecutive ranges, [__first,__middle) and |
| 2539 | * [__middle,__last), and puts the result in [__first,__last). The |
| 2540 | * output will be sorted. The sort is @e stable, that is, for |
| 2541 | * equivalent elements in the two ranges, elements from the first |
| 2542 | * range will always come before elements from the second. |
| 2543 | * |
| 2544 | * If enough additional memory is available, this takes (__last-__first)-1 |
| 2545 | * comparisons. Otherwise an NlogN algorithm is used, where N is |
| 2546 | * distance(__first,__last). |
| 2547 | */ |
| 2548 | template<typename _BidirectionalIterator> |
| 2549 | inline void |
| 2550 | inplace_merge(_BidirectionalIterator __first, |
| 2551 | _BidirectionalIterator __middle, |
| 2552 | _BidirectionalIterator __last) |
| 2553 | { |
| 2554 | // concept requirements |
| 2555 | __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< |
| 2556 | _BidirectionalIterator>) |
| 2557 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 2558 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 2559 | __glibcxx_requires_sorted(__first, __middle); |
| 2560 | __glibcxx_requires_sorted(__middle, __last); |
| 2561 | __glibcxx_requires_irreflexive(__first, __last); |
| 2562 | |
| 2563 | std::__inplace_merge(__first, __middle, __last, |
| 2564 | __gnu_cxx::__ops::__iter_less_iter()); |
| 2565 | } |
| 2566 | |
| 2567 | /** |
| 2568 | * @brief Merges two sorted ranges in place. |
| 2569 | * @ingroup sorting_algorithms |
| 2570 | * @param __first An iterator. |
| 2571 | * @param __middle Another iterator. |
| 2572 | * @param __last Another iterator. |
| 2573 | * @param __comp A functor to use for comparisons. |
| 2574 | * @return Nothing. |
| 2575 | * |
| 2576 | * Merges two sorted and consecutive ranges, [__first,__middle) and |
| 2577 | * [middle,last), and puts the result in [__first,__last). The output will |
| 2578 | * be sorted. The sort is @e stable, that is, for equivalent |
| 2579 | * elements in the two ranges, elements from the first range will always |
| 2580 | * come before elements from the second. |
| 2581 | * |
| 2582 | * If enough additional memory is available, this takes (__last-__first)-1 |
| 2583 | * comparisons. Otherwise an NlogN algorithm is used, where N is |
| 2584 | * distance(__first,__last). |
| 2585 | * |
| 2586 | * The comparison function should have the same effects on ordering as |
| 2587 | * the function used for the initial sort. |
| 2588 | */ |
| 2589 | template<typename _BidirectionalIterator, typename _Compare> |
| 2590 | inline void |
| 2591 | inplace_merge(_BidirectionalIterator __first, |
| 2592 | _BidirectionalIterator __middle, |
| 2593 | _BidirectionalIterator __last, |
| 2594 | _Compare __comp) |
| 2595 | { |
| 2596 | // concept requirements |
| 2597 | __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept< |
| 2598 | _BidirectionalIterator>) |
| 2599 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2600 | typename iterator_traits<_BidirectionalIterator>::value_type, |
| 2601 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 2602 | __glibcxx_requires_sorted_pred(__first, __middle, __comp); |
| 2603 | __glibcxx_requires_sorted_pred(__middle, __last, __comp); |
| 2604 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 2605 | |
| 2606 | std::__inplace_merge(__first, __middle, __last, |
| 2607 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 2608 | } |
| 2609 | |
| 2610 | |
| 2611 | /// This is a helper function for the __merge_sort_loop routines. |
| 2612 | template<typename _InputIterator, typename _OutputIterator, |
| 2613 | typename _Compare> |
| 2614 | _OutputIterator |
| 2615 | __move_merge(_InputIterator __first1, _InputIterator __last1, |
| 2616 | _InputIterator __first2, _InputIterator __last2, |
| 2617 | _OutputIterator __result, _Compare __comp) |
| 2618 | { |
| 2619 | while (__first1 != __last1 && __first2 != __last2) |
| 2620 | { |
| 2621 | if (__comp(__first2, __first1)) |
| 2622 | { |
| 2623 | *__result = _GLIBCXX_MOVE(*__first2); |
| 2624 | ++__first2; |
| 2625 | } |
| 2626 | else |
| 2627 | { |
| 2628 | *__result = _GLIBCXX_MOVE(*__first1); |
| 2629 | ++__first1; |
| 2630 | } |
| 2631 | ++__result; |
| 2632 | } |
| 2633 | return _GLIBCXX_MOVE3(__first2, __last2, |
| 2634 | _GLIBCXX_MOVE3(__first1, __last1, |
| 2635 | __result)); |
| 2636 | } |
| 2637 | |
| 2638 | template<typename _RandomAccessIterator1, typename _RandomAccessIterator2, |
| 2639 | typename _Distance, typename _Compare> |
| 2640 | void |
| 2641 | __merge_sort_loop(_RandomAccessIterator1 __first, |
| 2642 | _RandomAccessIterator1 __last, |
| 2643 | _RandomAccessIterator2 __result, _Distance __step_size, |
| 2644 | _Compare __comp) |
| 2645 | { |
| 2646 | const _Distance __two_step = 2 * __step_size; |
| 2647 | |
| 2648 | while (__last - __first >= __two_step) |
| 2649 | { |
| 2650 | __result = std::__move_merge(__first, __first + __step_size, |
| 2651 | __first + __step_size, |
| 2652 | __first + __two_step, |
| 2653 | __result, __comp); |
| 2654 | __first += __two_step; |
| 2655 | } |
| 2656 | __step_size = std::min(_Distance(__last - __first), __step_size); |
| 2657 | |
| 2658 | std::__move_merge(__first, __first + __step_size, |
| 2659 | __first + __step_size, __last, __result, __comp); |
| 2660 | } |
| 2661 | |
| 2662 | template<typename _RandomAccessIterator, typename _Distance, |
| 2663 | typename _Compare> |
| 2664 | _GLIBCXX20_CONSTEXPR |
| 2665 | void |
| 2666 | __chunk_insertion_sort(_RandomAccessIterator __first, |
| 2667 | _RandomAccessIterator __last, |
| 2668 | _Distance __chunk_size, _Compare __comp) |
| 2669 | { |
| 2670 | while (__last - __first >= __chunk_size) |
| 2671 | { |
| 2672 | std::__insertion_sort(__first, __first + __chunk_size, __comp); |
| 2673 | __first += __chunk_size; |
| 2674 | } |
| 2675 | std::__insertion_sort(__first, __last, __comp); |
| 2676 | } |
| 2677 | |
| 2678 | enum { _S_chunk_size = 7 }; |
| 2679 | |
| 2680 | template<typename _RandomAccessIterator, typename _Pointer, typename _Compare> |
| 2681 | void |
| 2682 | __merge_sort_with_buffer(_RandomAccessIterator __first, |
| 2683 | _RandomAccessIterator __last, |
| 2684 | _Pointer __buffer, _Compare __comp) |
| 2685 | { |
| 2686 | typedef typename iterator_traits<_RandomAccessIterator>::difference_type |
| 2687 | _Distance; |
| 2688 | |
| 2689 | const _Distance __len = __last - __first; |
| 2690 | const _Pointer __buffer_last = __buffer + __len; |
| 2691 | |
| 2692 | _Distance __step_size = _S_chunk_size; |
| 2693 | std::__chunk_insertion_sort(__first, __last, __step_size, __comp); |
| 2694 | |
| 2695 | while (__step_size < __len) |
| 2696 | { |
| 2697 | std::__merge_sort_loop(__first, __last, __buffer, |
| 2698 | __step_size, __comp); |
| 2699 | __step_size *= 2; |
| 2700 | std::__merge_sort_loop(__buffer, __buffer_last, __first, |
| 2701 | __step_size, __comp); |
| 2702 | __step_size *= 2; |
| 2703 | } |
| 2704 | } |
| 2705 | |
| 2706 | template<typename _RandomAccessIterator, typename _Pointer, |
| 2707 | typename _Distance, typename _Compare> |
| 2708 | void |
| 2709 | __stable_sort_adaptive(_RandomAccessIterator __first, |
| 2710 | _RandomAccessIterator __last, |
| 2711 | _Pointer __buffer, _Distance __buffer_size, |
| 2712 | _Compare __comp) |
| 2713 | { |
| 2714 | const _Distance __len = (__last - __first + 1) / 2; |
| 2715 | const _RandomAccessIterator __middle = __first + __len; |
| 2716 | if (__len > __buffer_size) |
| 2717 | { |
| 2718 | std::__stable_sort_adaptive(__first, __middle, __buffer, |
| 2719 | __buffer_size, __comp); |
| 2720 | std::__stable_sort_adaptive(__middle, __last, __buffer, |
| 2721 | __buffer_size, __comp); |
| 2722 | } |
| 2723 | else |
| 2724 | { |
| 2725 | std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp); |
| 2726 | std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp); |
| 2727 | } |
| 2728 | |
| 2729 | std::__merge_adaptive(__first, __middle, __last, |
| 2730 | _Distance(__middle - __first), |
| 2731 | _Distance(__last - __middle), |
| 2732 | __buffer, __buffer_size, |
| 2733 | __comp); |
| 2734 | } |
| 2735 | |
| 2736 | /// This is a helper function for the stable sorting routines. |
| 2737 | template<typename _RandomAccessIterator, typename _Compare> |
| 2738 | void |
| 2739 | __inplace_stable_sort(_RandomAccessIterator __first, |
| 2740 | _RandomAccessIterator __last, _Compare __comp) |
| 2741 | { |
| 2742 | if (__last - __first < 15) |
| 2743 | { |
| 2744 | std::__insertion_sort(__first, __last, __comp); |
| 2745 | return; |
| 2746 | } |
| 2747 | _RandomAccessIterator __middle = __first + (__last - __first) / 2; |
| 2748 | std::__inplace_stable_sort(__first, __middle, __comp); |
| 2749 | std::__inplace_stable_sort(__middle, __last, __comp); |
| 2750 | std::__merge_without_buffer(__first, __middle, __last, |
| 2751 | __middle - __first, |
| 2752 | __last - __middle, |
| 2753 | __comp); |
| 2754 | } |
| 2755 | |
| 2756 | // stable_sort |
| 2757 | |
| 2758 | // Set algorithms: includes, set_union, set_intersection, set_difference, |
| 2759 | // set_symmetric_difference. All of these algorithms have the precondition |
| 2760 | // that their input ranges are sorted and the postcondition that their output |
| 2761 | // ranges are sorted. |
| 2762 | |
| 2763 | template<typename _InputIterator1, typename _InputIterator2, |
| 2764 | typename _Compare> |
| 2765 | _GLIBCXX20_CONSTEXPR |
| 2766 | bool |
| 2767 | __includes(_InputIterator1 __first1, _InputIterator1 __last1, |
| 2768 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 2769 | _Compare __comp) |
| 2770 | { |
| 2771 | while (__first1 != __last1 && __first2 != __last2) |
| 2772 | { |
| 2773 | if (__comp(__first2, __first1)) |
| 2774 | return false; |
| 2775 | if (!__comp(__first1, __first2)) |
| 2776 | ++__first2; |
| 2777 | ++__first1; |
| 2778 | } |
| 2779 | |
| 2780 | return __first2 == __last2; |
| 2781 | } |
| 2782 | |
| 2783 | /** |
| 2784 | * @brief Determines whether all elements of a sequence exists in a range. |
| 2785 | * @param __first1 Start of search range. |
| 2786 | * @param __last1 End of search range. |
| 2787 | * @param __first2 Start of sequence |
| 2788 | * @param __last2 End of sequence. |
| 2789 | * @return True if each element in [__first2,__last2) is contained in order |
| 2790 | * within [__first1,__last1). False otherwise. |
| 2791 | * @ingroup set_algorithms |
| 2792 | * |
| 2793 | * This operation expects both [__first1,__last1) and |
| 2794 | * [__first2,__last2) to be sorted. Searches for the presence of |
| 2795 | * each element in [__first2,__last2) within [__first1,__last1). |
| 2796 | * The iterators over each range only move forward, so this is a |
| 2797 | * linear algorithm. If an element in [__first2,__last2) is not |
| 2798 | * found before the search iterator reaches @p __last2, false is |
| 2799 | * returned. |
| 2800 | */ |
| 2801 | template<typename _InputIterator1, typename _InputIterator2> |
| 2802 | _GLIBCXX20_CONSTEXPR |
| 2803 | inline bool |
| 2804 | includes(_InputIterator1 __first1, _InputIterator1 __last1, |
| 2805 | _InputIterator2 __first2, _InputIterator2 __last2) |
| 2806 | { |
| 2807 | // concept requirements |
| 2808 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 2809 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 2810 | __glibcxx_function_requires(_LessThanOpConcept< |
| 2811 | typename iterator_traits<_InputIterator1>::value_type, |
| 2812 | typename iterator_traits<_InputIterator2>::value_type>) |
| 2813 | __glibcxx_function_requires(_LessThanOpConcept< |
| 2814 | typename iterator_traits<_InputIterator2>::value_type, |
| 2815 | typename iterator_traits<_InputIterator1>::value_type>) |
| 2816 | __glibcxx_requires_sorted_set(__first1, __last1, __first2); |
| 2817 | __glibcxx_requires_sorted_set(__first2, __last2, __first1); |
| 2818 | __glibcxx_requires_irreflexive2(__first1, __last1); |
| 2819 | __glibcxx_requires_irreflexive2(__first2, __last2); |
| 2820 | |
| 2821 | return std::__includes(__first1, __last1, __first2, __last2, |
| 2822 | __gnu_cxx::__ops::__iter_less_iter()); |
| 2823 | } |
| 2824 | |
| 2825 | /** |
| 2826 | * @brief Determines whether all elements of a sequence exists in a range |
| 2827 | * using comparison. |
| 2828 | * @ingroup set_algorithms |
| 2829 | * @param __first1 Start of search range. |
| 2830 | * @param __last1 End of search range. |
| 2831 | * @param __first2 Start of sequence |
| 2832 | * @param __last2 End of sequence. |
| 2833 | * @param __comp Comparison function to use. |
| 2834 | * @return True if each element in [__first2,__last2) is contained |
| 2835 | * in order within [__first1,__last1) according to comp. False |
| 2836 | * otherwise. @ingroup set_algorithms |
| 2837 | * |
| 2838 | * This operation expects both [__first1,__last1) and |
| 2839 | * [__first2,__last2) to be sorted. Searches for the presence of |
| 2840 | * each element in [__first2,__last2) within [__first1,__last1), |
| 2841 | * using comp to decide. The iterators over each range only move |
| 2842 | * forward, so this is a linear algorithm. If an element in |
| 2843 | * [__first2,__last2) is not found before the search iterator |
| 2844 | * reaches @p __last2, false is returned. |
| 2845 | */ |
| 2846 | template<typename _InputIterator1, typename _InputIterator2, |
| 2847 | typename _Compare> |
| 2848 | _GLIBCXX20_CONSTEXPR |
| 2849 | inline bool |
| 2850 | includes(_InputIterator1 __first1, _InputIterator1 __last1, |
| 2851 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 2852 | _Compare __comp) |
| 2853 | { |
| 2854 | // concept requirements |
| 2855 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 2856 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 2857 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2858 | typename iterator_traits<_InputIterator1>::value_type, |
| 2859 | typename iterator_traits<_InputIterator2>::value_type>) |
| 2860 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2861 | typename iterator_traits<_InputIterator2>::value_type, |
| 2862 | typename iterator_traits<_InputIterator1>::value_type>) |
| 2863 | __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); |
| 2864 | __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); |
| 2865 | __glibcxx_requires_irreflexive_pred2(__first1, __last1, __comp); |
| 2866 | __glibcxx_requires_irreflexive_pred2(__first2, __last2, __comp); |
| 2867 | |
| 2868 | return std::__includes(__first1, __last1, __first2, __last2, |
| 2869 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 2870 | } |
| 2871 | |
| 2872 | // nth_element |
| 2873 | // merge |
| 2874 | // set_difference |
| 2875 | // set_intersection |
| 2876 | // set_union |
| 2877 | // stable_sort |
| 2878 | // set_symmetric_difference |
| 2879 | // min_element |
| 2880 | // max_element |
| 2881 | |
| 2882 | template<typename _BidirectionalIterator, typename _Compare> |
| 2883 | _GLIBCXX20_CONSTEXPR |
| 2884 | bool |
| 2885 | __next_permutation(_BidirectionalIterator __first, |
| 2886 | _BidirectionalIterator __last, _Compare __comp) |
| 2887 | { |
| 2888 | if (__first == __last) |
| 2889 | return false; |
| 2890 | _BidirectionalIterator __i = __first; |
| 2891 | ++__i; |
| 2892 | if (__i == __last) |
| 2893 | return false; |
| 2894 | __i = __last; |
| 2895 | --__i; |
| 2896 | |
| 2897 | for(;;) |
| 2898 | { |
| 2899 | _BidirectionalIterator __ii = __i; |
| 2900 | --__i; |
| 2901 | if (__comp(__i, __ii)) |
| 2902 | { |
| 2903 | _BidirectionalIterator __j = __last; |
| 2904 | while (!__comp(__i, --__j)) |
| 2905 | {} |
| 2906 | std::iter_swap(__i, __j); |
| 2907 | std::__reverse(__ii, __last, |
| 2908 | std::__iterator_category(__first)); |
| 2909 | return true; |
| 2910 | } |
| 2911 | if (__i == __first) |
| 2912 | { |
| 2913 | std::__reverse(__first, __last, |
| 2914 | std::__iterator_category(__first)); |
| 2915 | return false; |
| 2916 | } |
| 2917 | } |
| 2918 | } |
| 2919 | |
| 2920 | /** |
| 2921 | * @brief Permute range into the next @e dictionary ordering. |
| 2922 | * @ingroup sorting_algorithms |
| 2923 | * @param __first Start of range. |
| 2924 | * @param __last End of range. |
| 2925 | * @return False if wrapped to first permutation, true otherwise. |
| 2926 | * |
| 2927 | * Treats all permutations of the range as a set of @e dictionary sorted |
| 2928 | * sequences. Permutes the current sequence into the next one of this set. |
| 2929 | * Returns true if there are more sequences to generate. If the sequence |
| 2930 | * is the largest of the set, the smallest is generated and false returned. |
| 2931 | */ |
| 2932 | template<typename _BidirectionalIterator> |
| 2933 | _GLIBCXX20_CONSTEXPR |
| 2934 | inline bool |
| 2935 | next_permutation(_BidirectionalIterator __first, |
| 2936 | _BidirectionalIterator __last) |
| 2937 | { |
| 2938 | // concept requirements |
| 2939 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 2940 | _BidirectionalIterator>) |
| 2941 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 2942 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 2943 | __glibcxx_requires_valid_range(__first, __last); |
| 2944 | __glibcxx_requires_irreflexive(__first, __last); |
| 2945 | |
| 2946 | return std::__next_permutation |
| 2947 | (__first, __last, __gnu_cxx::__ops::__iter_less_iter()); |
| 2948 | } |
| 2949 | |
| 2950 | /** |
| 2951 | * @brief Permute range into the next @e dictionary ordering using |
| 2952 | * comparison functor. |
| 2953 | * @ingroup sorting_algorithms |
| 2954 | * @param __first Start of range. |
| 2955 | * @param __last End of range. |
| 2956 | * @param __comp A comparison functor. |
| 2957 | * @return False if wrapped to first permutation, true otherwise. |
| 2958 | * |
| 2959 | * Treats all permutations of the range [__first,__last) as a set of |
| 2960 | * @e dictionary sorted sequences ordered by @p __comp. Permutes the current |
| 2961 | * sequence into the next one of this set. Returns true if there are more |
| 2962 | * sequences to generate. If the sequence is the largest of the set, the |
| 2963 | * smallest is generated and false returned. |
| 2964 | */ |
| 2965 | template<typename _BidirectionalIterator, typename _Compare> |
| 2966 | _GLIBCXX20_CONSTEXPR |
| 2967 | inline bool |
| 2968 | next_permutation(_BidirectionalIterator __first, |
| 2969 | _BidirectionalIterator __last, _Compare __comp) |
| 2970 | { |
| 2971 | // concept requirements |
| 2972 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 2973 | _BidirectionalIterator>) |
| 2974 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 2975 | typename iterator_traits<_BidirectionalIterator>::value_type, |
| 2976 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 2977 | __glibcxx_requires_valid_range(__first, __last); |
| 2978 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 2979 | |
| 2980 | return std::__next_permutation |
| 2981 | (__first, __last, __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 2982 | } |
| 2983 | |
| 2984 | template<typename _BidirectionalIterator, typename _Compare> |
| 2985 | _GLIBCXX20_CONSTEXPR |
| 2986 | bool |
| 2987 | __prev_permutation(_BidirectionalIterator __first, |
| 2988 | _BidirectionalIterator __last, _Compare __comp) |
| 2989 | { |
| 2990 | if (__first == __last) |
| 2991 | return false; |
| 2992 | _BidirectionalIterator __i = __first; |
| 2993 | ++__i; |
| 2994 | if (__i == __last) |
| 2995 | return false; |
| 2996 | __i = __last; |
| 2997 | --__i; |
| 2998 | |
| 2999 | for(;;) |
| 3000 | { |
| 3001 | _BidirectionalIterator __ii = __i; |
| 3002 | --__i; |
| 3003 | if (__comp(__ii, __i)) |
| 3004 | { |
| 3005 | _BidirectionalIterator __j = __last; |
| 3006 | while (!__comp(--__j, __i)) |
| 3007 | {} |
| 3008 | std::iter_swap(__i, __j); |
| 3009 | std::__reverse(__ii, __last, |
| 3010 | std::__iterator_category(__first)); |
| 3011 | return true; |
| 3012 | } |
| 3013 | if (__i == __first) |
| 3014 | { |
| 3015 | std::__reverse(__first, __last, |
| 3016 | std::__iterator_category(__first)); |
| 3017 | return false; |
| 3018 | } |
| 3019 | } |
| 3020 | } |
| 3021 | |
| 3022 | /** |
| 3023 | * @brief Permute range into the previous @e dictionary ordering. |
| 3024 | * @ingroup sorting_algorithms |
| 3025 | * @param __first Start of range. |
| 3026 | * @param __last End of range. |
| 3027 | * @return False if wrapped to last permutation, true otherwise. |
| 3028 | * |
| 3029 | * Treats all permutations of the range as a set of @e dictionary sorted |
| 3030 | * sequences. Permutes the current sequence into the previous one of this |
| 3031 | * set. Returns true if there are more sequences to generate. If the |
| 3032 | * sequence is the smallest of the set, the largest is generated and false |
| 3033 | * returned. |
| 3034 | */ |
| 3035 | template<typename _BidirectionalIterator> |
| 3036 | _GLIBCXX20_CONSTEXPR |
| 3037 | inline bool |
| 3038 | prev_permutation(_BidirectionalIterator __first, |
| 3039 | _BidirectionalIterator __last) |
| 3040 | { |
| 3041 | // concept requirements |
| 3042 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 3043 | _BidirectionalIterator>) |
| 3044 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 3045 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 3046 | __glibcxx_requires_valid_range(__first, __last); |
| 3047 | __glibcxx_requires_irreflexive(__first, __last); |
| 3048 | |
| 3049 | return std::__prev_permutation(__first, __last, |
| 3050 | __gnu_cxx::__ops::__iter_less_iter()); |
| 3051 | } |
| 3052 | |
| 3053 | /** |
| 3054 | * @brief Permute range into the previous @e dictionary ordering using |
| 3055 | * comparison functor. |
| 3056 | * @ingroup sorting_algorithms |
| 3057 | * @param __first Start of range. |
| 3058 | * @param __last End of range. |
| 3059 | * @param __comp A comparison functor. |
| 3060 | * @return False if wrapped to last permutation, true otherwise. |
| 3061 | * |
| 3062 | * Treats all permutations of the range [__first,__last) as a set of |
| 3063 | * @e dictionary sorted sequences ordered by @p __comp. Permutes the current |
| 3064 | * sequence into the previous one of this set. Returns true if there are |
| 3065 | * more sequences to generate. If the sequence is the smallest of the set, |
| 3066 | * the largest is generated and false returned. |
| 3067 | */ |
| 3068 | template<typename _BidirectionalIterator, typename _Compare> |
| 3069 | _GLIBCXX20_CONSTEXPR |
| 3070 | inline bool |
| 3071 | prev_permutation(_BidirectionalIterator __first, |
| 3072 | _BidirectionalIterator __last, _Compare __comp) |
| 3073 | { |
| 3074 | // concept requirements |
| 3075 | __glibcxx_function_requires(_BidirectionalIteratorConcept< |
| 3076 | _BidirectionalIterator>) |
| 3077 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 3078 | typename iterator_traits<_BidirectionalIterator>::value_type, |
| 3079 | typename iterator_traits<_BidirectionalIterator>::value_type>) |
| 3080 | __glibcxx_requires_valid_range(__first, __last); |
| 3081 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 3082 | |
| 3083 | return std::__prev_permutation(__first, __last, |
| 3084 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 3085 | } |
| 3086 | |
| 3087 | // replace |
| 3088 | // replace_if |
| 3089 | |
| 3090 | template<typename _InputIterator, typename _OutputIterator, |
| 3091 | typename _Predicate, typename _Tp> |
| 3092 | _GLIBCXX20_CONSTEXPR |
| 3093 | _OutputIterator |
| 3094 | __replace_copy_if(_InputIterator __first, _InputIterator __last, |
| 3095 | _OutputIterator __result, |
| 3096 | _Predicate __pred, const _Tp& __new_value) |
| 3097 | { |
| 3098 | for (; __first != __last; ++__first, (void)++__result) |
| 3099 | if (__pred(__first)) |
| 3100 | *__result = __new_value; |
| 3101 | else |
| 3102 | *__result = *__first; |
| 3103 | return __result; |
| 3104 | } |
| 3105 | |
| 3106 | /** |
| 3107 | * @brief Copy a sequence, replacing each element of one value with another |
| 3108 | * value. |
| 3109 | * @param __first An input iterator. |
| 3110 | * @param __last An input iterator. |
| 3111 | * @param __result An output iterator. |
| 3112 | * @param __old_value The value to be replaced. |
| 3113 | * @param __new_value The replacement value. |
| 3114 | * @return The end of the output sequence, @p result+(last-first). |
| 3115 | * |
| 3116 | * Copies each element in the input range @p [__first,__last) to the |
| 3117 | * output range @p [__result,__result+(__last-__first)) replacing elements |
| 3118 | * equal to @p __old_value with @p __new_value. |
| 3119 | */ |
| 3120 | template<typename _InputIterator, typename _OutputIterator, typename _Tp> |
| 3121 | _GLIBCXX20_CONSTEXPR |
| 3122 | inline _OutputIterator |
| 3123 | replace_copy(_InputIterator __first, _InputIterator __last, |
| 3124 | _OutputIterator __result, |
| 3125 | const _Tp& __old_value, const _Tp& __new_value) |
| 3126 | { |
| 3127 | // concept requirements |
| 3128 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3129 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 3130 | typename iterator_traits<_InputIterator>::value_type>) |
| 3131 | __glibcxx_function_requires(_EqualOpConcept< |
| 3132 | typename iterator_traits<_InputIterator>::value_type, _Tp>) |
| 3133 | __glibcxx_requires_valid_range(__first, __last); |
| 3134 | |
| 3135 | return std::__replace_copy_if(__first, __last, __result, |
| 3136 | __gnu_cxx::__ops::__iter_equals_val(__old_value), |
| 3137 | __new_value); |
| 3138 | } |
| 3139 | |
| 3140 | /** |
| 3141 | * @brief Copy a sequence, replacing each value for which a predicate |
| 3142 | * returns true with another value. |
| 3143 | * @ingroup mutating_algorithms |
| 3144 | * @param __first An input iterator. |
| 3145 | * @param __last An input iterator. |
| 3146 | * @param __result An output iterator. |
| 3147 | * @param __pred A predicate. |
| 3148 | * @param __new_value The replacement value. |
| 3149 | * @return The end of the output sequence, @p __result+(__last-__first). |
| 3150 | * |
| 3151 | * Copies each element in the range @p [__first,__last) to the range |
| 3152 | * @p [__result,__result+(__last-__first)) replacing elements for which |
| 3153 | * @p __pred returns true with @p __new_value. |
| 3154 | */ |
| 3155 | template<typename _InputIterator, typename _OutputIterator, |
| 3156 | typename _Predicate, typename _Tp> |
| 3157 | _GLIBCXX20_CONSTEXPR |
| 3158 | inline _OutputIterator |
| 3159 | replace_copy_if(_InputIterator __first, _InputIterator __last, |
| 3160 | _OutputIterator __result, |
| 3161 | _Predicate __pred, const _Tp& __new_value) |
| 3162 | { |
| 3163 | // concept requirements |
| 3164 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3165 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 3166 | typename iterator_traits<_InputIterator>::value_type>) |
| 3167 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 3168 | typename iterator_traits<_InputIterator>::value_type>) |
| 3169 | __glibcxx_requires_valid_range(__first, __last); |
| 3170 | |
| 3171 | return std::__replace_copy_if(__first, __last, __result, |
| 3172 | __gnu_cxx::__ops::__pred_iter(__pred), |
| 3173 | __new_value); |
| 3174 | } |
| 3175 | |
| 3176 | #if __cplusplus >= 201103L |
| 3177 | /** |
| 3178 | * @brief Determines whether the elements of a sequence are sorted. |
| 3179 | * @ingroup sorting_algorithms |
| 3180 | * @param __first An iterator. |
| 3181 | * @param __last Another iterator. |
| 3182 | * @return True if the elements are sorted, false otherwise. |
| 3183 | */ |
| 3184 | template<typename _ForwardIterator> |
| 3185 | _GLIBCXX20_CONSTEXPR |
| 3186 | inline bool |
| 3187 | is_sorted(_ForwardIterator __first, _ForwardIterator __last) |
| 3188 | { return std::is_sorted_until(__first, __last) == __last; } |
| 3189 | |
| 3190 | /** |
| 3191 | * @brief Determines whether the elements of a sequence are sorted |
| 3192 | * according to a comparison functor. |
| 3193 | * @ingroup sorting_algorithms |
| 3194 | * @param __first An iterator. |
| 3195 | * @param __last Another iterator. |
| 3196 | * @param __comp A comparison functor. |
| 3197 | * @return True if the elements are sorted, false otherwise. |
| 3198 | */ |
| 3199 | template<typename _ForwardIterator, typename _Compare> |
| 3200 | _GLIBCXX20_CONSTEXPR |
| 3201 | inline bool |
| 3202 | is_sorted(_ForwardIterator __first, _ForwardIterator __last, |
| 3203 | _Compare __comp) |
| 3204 | { return std::is_sorted_until(__first, __last, __comp) == __last; } |
| 3205 | |
| 3206 | template<typename _ForwardIterator, typename _Compare> |
| 3207 | _GLIBCXX20_CONSTEXPR |
| 3208 | _ForwardIterator |
| 3209 | __is_sorted_until(_ForwardIterator __first, _ForwardIterator __last, |
| 3210 | _Compare __comp) |
| 3211 | { |
| 3212 | if (__first == __last) |
| 3213 | return __last; |
| 3214 | |
| 3215 | _ForwardIterator __next = __first; |
| 3216 | for (++__next; __next != __last; __first = __next, (void)++__next) |
| 3217 | if (__comp(__next, __first)) |
| 3218 | return __next; |
| 3219 | return __next; |
| 3220 | } |
| 3221 | |
| 3222 | /** |
| 3223 | * @brief Determines the end of a sorted sequence. |
| 3224 | * @ingroup sorting_algorithms |
| 3225 | * @param __first An iterator. |
| 3226 | * @param __last Another iterator. |
| 3227 | * @return An iterator pointing to the last iterator i in [__first, __last) |
| 3228 | * for which the range [__first, i) is sorted. |
| 3229 | */ |
| 3230 | template<typename _ForwardIterator> |
| 3231 | _GLIBCXX20_CONSTEXPR |
| 3232 | inline _ForwardIterator |
| 3233 | is_sorted_until(_ForwardIterator __first, _ForwardIterator __last) |
| 3234 | { |
| 3235 | // concept requirements |
| 3236 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3237 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 3238 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3239 | __glibcxx_requires_valid_range(__first, __last); |
| 3240 | __glibcxx_requires_irreflexive(__first, __last); |
| 3241 | |
| 3242 | return std::__is_sorted_until(__first, __last, |
| 3243 | __gnu_cxx::__ops::__iter_less_iter()); |
| 3244 | } |
| 3245 | |
| 3246 | /** |
| 3247 | * @brief Determines the end of a sorted sequence using comparison functor. |
| 3248 | * @ingroup sorting_algorithms |
| 3249 | * @param __first An iterator. |
| 3250 | * @param __last Another iterator. |
| 3251 | * @param __comp A comparison functor. |
| 3252 | * @return An iterator pointing to the last iterator i in [__first, __last) |
| 3253 | * for which the range [__first, i) is sorted. |
| 3254 | */ |
| 3255 | template<typename _ForwardIterator, typename _Compare> |
| 3256 | _GLIBCXX20_CONSTEXPR |
| 3257 | inline _ForwardIterator |
| 3258 | is_sorted_until(_ForwardIterator __first, _ForwardIterator __last, |
| 3259 | _Compare __comp) |
| 3260 | { |
| 3261 | // concept requirements |
| 3262 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3263 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 3264 | typename iterator_traits<_ForwardIterator>::value_type, |
| 3265 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3266 | __glibcxx_requires_valid_range(__first, __last); |
| 3267 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 3268 | |
| 3269 | return std::__is_sorted_until(__first, __last, |
| 3270 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 3271 | } |
| 3272 | |
| 3273 | /** |
| 3274 | * @brief Determines min and max at once as an ordered pair. |
| 3275 | * @ingroup sorting_algorithms |
| 3276 | * @param __a A thing of arbitrary type. |
| 3277 | * @param __b Another thing of arbitrary type. |
| 3278 | * @return A pair(__b, __a) if __b is smaller than __a, pair(__a, |
| 3279 | * __b) otherwise. |
| 3280 | */ |
| 3281 | template<typename _Tp> |
| 3282 | _GLIBCXX14_CONSTEXPR |
| 3283 | inline pair<const _Tp&, const _Tp&> |
| 3284 | minmax(const _Tp& __a, const _Tp& __b) |
| 3285 | { |
| 3286 | // concept requirements |
| 3287 | __glibcxx_function_requires(_LessThanComparableConcept<_Tp>) |
| 3288 | |
| 3289 | return __b < __a ? pair<const _Tp&, const _Tp&>(__b, __a) |
| 3290 | : pair<const _Tp&, const _Tp&>(__a, __b); |
| 3291 | } |
| 3292 | |
| 3293 | /** |
| 3294 | * @brief Determines min and max at once as an ordered pair. |
| 3295 | * @ingroup sorting_algorithms |
| 3296 | * @param __a A thing of arbitrary type. |
| 3297 | * @param __b Another thing of arbitrary type. |
| 3298 | * @param __comp A @link comparison_functors comparison functor @endlink. |
| 3299 | * @return A pair(__b, __a) if __b is smaller than __a, pair(__a, |
| 3300 | * __b) otherwise. |
| 3301 | */ |
| 3302 | template<typename _Tp, typename _Compare> |
| 3303 | _GLIBCXX14_CONSTEXPR |
| 3304 | inline pair<const _Tp&, const _Tp&> |
| 3305 | minmax(const _Tp& __a, const _Tp& __b, _Compare __comp) |
| 3306 | { |
| 3307 | return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) |
| 3308 | : pair<const _Tp&, const _Tp&>(__a, __b); |
| 3309 | } |
| 3310 | |
| 3311 | template<typename _ForwardIterator, typename _Compare> |
| 3312 | _GLIBCXX14_CONSTEXPR |
| 3313 | pair<_ForwardIterator, _ForwardIterator> |
| 3314 | __minmax_element(_ForwardIterator __first, _ForwardIterator __last, |
| 3315 | _Compare __comp) |
| 3316 | { |
| 3317 | _ForwardIterator __next = __first; |
| 3318 | if (__first == __last |
| 3319 | || ++__next == __last) |
| 3320 | return std::make_pair(__first, __first); |
| 3321 | |
| 3322 | _ForwardIterator __min{}, __max{}; |
| 3323 | if (__comp(__next, __first)) |
| 3324 | { |
| 3325 | __min = __next; |
| 3326 | __max = __first; |
| 3327 | } |
| 3328 | else |
| 3329 | { |
| 3330 | __min = __first; |
| 3331 | __max = __next; |
| 3332 | } |
| 3333 | |
| 3334 | __first = __next; |
| 3335 | ++__first; |
| 3336 | |
| 3337 | while (__first != __last) |
| 3338 | { |
| 3339 | __next = __first; |
| 3340 | if (++__next == __last) |
| 3341 | { |
| 3342 | if (__comp(__first, __min)) |
| 3343 | __min = __first; |
| 3344 | else if (!__comp(__first, __max)) |
| 3345 | __max = __first; |
| 3346 | break; |
| 3347 | } |
| 3348 | |
| 3349 | if (__comp(__next, __first)) |
| 3350 | { |
| 3351 | if (__comp(__next, __min)) |
| 3352 | __min = __next; |
| 3353 | if (!__comp(__first, __max)) |
| 3354 | __max = __first; |
| 3355 | } |
| 3356 | else |
| 3357 | { |
| 3358 | if (__comp(__first, __min)) |
| 3359 | __min = __first; |
| 3360 | if (!__comp(__next, __max)) |
| 3361 | __max = __next; |
| 3362 | } |
| 3363 | |
| 3364 | __first = __next; |
| 3365 | ++__first; |
| 3366 | } |
| 3367 | |
| 3368 | return std::make_pair(__min, __max); |
| 3369 | } |
| 3370 | |
| 3371 | /** |
| 3372 | * @brief Return a pair of iterators pointing to the minimum and maximum |
| 3373 | * elements in a range. |
| 3374 | * @ingroup sorting_algorithms |
| 3375 | * @param __first Start of range. |
| 3376 | * @param __last End of range. |
| 3377 | * @return make_pair(m, M), where m is the first iterator i in |
| 3378 | * [__first, __last) such that no other element in the range is |
| 3379 | * smaller, and where M is the last iterator i in [__first, __last) |
| 3380 | * such that no other element in the range is larger. |
| 3381 | */ |
| 3382 | template<typename _ForwardIterator> |
| 3383 | _GLIBCXX14_CONSTEXPR |
| 3384 | inline pair<_ForwardIterator, _ForwardIterator> |
| 3385 | minmax_element(_ForwardIterator __first, _ForwardIterator __last) |
| 3386 | { |
| 3387 | // concept requirements |
| 3388 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3389 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 3390 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3391 | __glibcxx_requires_valid_range(__first, __last); |
| 3392 | __glibcxx_requires_irreflexive(__first, __last); |
| 3393 | |
| 3394 | return std::__minmax_element(__first, __last, |
| 3395 | __gnu_cxx::__ops::__iter_less_iter()); |
| 3396 | } |
| 3397 | |
| 3398 | /** |
| 3399 | * @brief Return a pair of iterators pointing to the minimum and maximum |
| 3400 | * elements in a range. |
| 3401 | * @ingroup sorting_algorithms |
| 3402 | * @param __first Start of range. |
| 3403 | * @param __last End of range. |
| 3404 | * @param __comp Comparison functor. |
| 3405 | * @return make_pair(m, M), where m is the first iterator i in |
| 3406 | * [__first, __last) such that no other element in the range is |
| 3407 | * smaller, and where M is the last iterator i in [__first, __last) |
| 3408 | * such that no other element in the range is larger. |
| 3409 | */ |
| 3410 | template<typename _ForwardIterator, typename _Compare> |
| 3411 | _GLIBCXX14_CONSTEXPR |
| 3412 | inline pair<_ForwardIterator, _ForwardIterator> |
| 3413 | minmax_element(_ForwardIterator __first, _ForwardIterator __last, |
| 3414 | _Compare __comp) |
| 3415 | { |
| 3416 | // concept requirements |
| 3417 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3418 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 3419 | typename iterator_traits<_ForwardIterator>::value_type, |
| 3420 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3421 | __glibcxx_requires_valid_range(__first, __last); |
| 3422 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 3423 | |
| 3424 | return std::__minmax_element(__first, __last, |
| 3425 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 3426 | } |
| 3427 | |
| 3428 | template<typename _Tp> |
| 3429 | _GLIBCXX14_CONSTEXPR |
| 3430 | inline pair<_Tp, _Tp> |
| 3431 | minmax(initializer_list<_Tp> __l) |
| 3432 | { |
| 3433 | __glibcxx_requires_irreflexive(__l.begin(), __l.end()); |
| 3434 | pair<const _Tp*, const _Tp*> __p = |
| 3435 | std::__minmax_element(__l.begin(), __l.end(), |
| 3436 | __gnu_cxx::__ops::__iter_less_iter()); |
| 3437 | return std::make_pair(*__p.first, *__p.second); |
| 3438 | } |
| 3439 | |
| 3440 | template<typename _Tp, typename _Compare> |
| 3441 | _GLIBCXX14_CONSTEXPR |
| 3442 | inline pair<_Tp, _Tp> |
| 3443 | minmax(initializer_list<_Tp> __l, _Compare __comp) |
| 3444 | { |
| 3445 | __glibcxx_requires_irreflexive_pred(__l.begin(), __l.end(), __comp); |
| 3446 | pair<const _Tp*, const _Tp*> __p = |
| 3447 | std::__minmax_element(__l.begin(), __l.end(), |
| 3448 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 3449 | return std::make_pair(*__p.first, *__p.second); |
| 3450 | } |
| 3451 | |
| 3452 | /** |
| 3453 | * @brief Checks whether a permutation of the second sequence is equal |
| 3454 | * to the first sequence. |
| 3455 | * @ingroup non_mutating_algorithms |
| 3456 | * @param __first1 Start of first range. |
| 3457 | * @param __last1 End of first range. |
| 3458 | * @param __first2 Start of second range. |
| 3459 | * @param __pred A binary predicate. |
| 3460 | * @return true if there exists a permutation of the elements in |
| 3461 | * the range [__first2, __first2 + (__last1 - __first1)), |
| 3462 | * beginning with ForwardIterator2 begin, such that |
| 3463 | * equal(__first1, __last1, __begin, __pred) returns true; |
| 3464 | * otherwise, returns false. |
| 3465 | */ |
| 3466 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 3467 | typename _BinaryPredicate> |
| 3468 | _GLIBCXX20_CONSTEXPR |
| 3469 | inline bool |
| 3470 | is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 3471 | _ForwardIterator2 __first2, _BinaryPredicate __pred) |
| 3472 | { |
| 3473 | // concept requirements |
| 3474 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) |
| 3475 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) |
| 3476 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 3477 | typename iterator_traits<_ForwardIterator1>::value_type, |
| 3478 | typename iterator_traits<_ForwardIterator2>::value_type>) |
| 3479 | __glibcxx_requires_valid_range(__first1, __last1); |
| 3480 | |
| 3481 | return std::__is_permutation(__first1, __last1, __first2, |
| 3482 | __gnu_cxx::__ops::__iter_comp_iter(__pred)); |
| 3483 | } |
| 3484 | |
| 3485 | #if __cplusplus > 201103L |
| 3486 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 3487 | typename _BinaryPredicate> |
| 3488 | _GLIBCXX20_CONSTEXPR |
| 3489 | bool |
| 3490 | __is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 3491 | _ForwardIterator2 __first2, _ForwardIterator2 __last2, |
| 3492 | _BinaryPredicate __pred) |
| 3493 | { |
| 3494 | using _Cat1 |
| 3495 | = typename iterator_traits<_ForwardIterator1>::iterator_category; |
| 3496 | using _Cat2 |
| 3497 | = typename iterator_traits<_ForwardIterator2>::iterator_category; |
| 3498 | using _It1_is_RA = is_same<_Cat1, random_access_iterator_tag>; |
| 3499 | using _It2_is_RA = is_same<_Cat2, random_access_iterator_tag>; |
| 3500 | constexpr bool __ra_iters = _It1_is_RA() && _It2_is_RA(); |
| 3501 | if (__ra_iters) |
| 3502 | { |
| 3503 | auto __d1 = std::distance(__first1, __last1); |
| 3504 | auto __d2 = std::distance(__first2, __last2); |
| 3505 | if (__d1 != __d2) |
| 3506 | return false; |
| 3507 | } |
| 3508 | |
| 3509 | // Efficiently compare identical prefixes: O(N) if sequences |
| 3510 | // have the same elements in the same order. |
| 3511 | for (; __first1 != __last1 && __first2 != __last2; |
| 3512 | ++__first1, (void)++__first2) |
| 3513 | if (!__pred(__first1, __first2)) |
| 3514 | break; |
| 3515 | |
| 3516 | if (__ra_iters) |
| 3517 | { |
| 3518 | if (__first1 == __last1) |
| 3519 | return true; |
| 3520 | } |
| 3521 | else |
| 3522 | { |
| 3523 | auto __d1 = std::distance(__first1, __last1); |
| 3524 | auto __d2 = std::distance(__first2, __last2); |
| 3525 | if (__d1 == 0 && __d2 == 0) |
| 3526 | return true; |
| 3527 | if (__d1 != __d2) |
| 3528 | return false; |
| 3529 | } |
| 3530 | |
| 3531 | for (_ForwardIterator1 __scan = __first1; __scan != __last1; ++__scan) |
| 3532 | { |
| 3533 | if (__scan != std::__find_if(__first1, __scan, |
| 3534 | __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan))) |
| 3535 | continue; // We've seen this one before. |
| 3536 | |
| 3537 | auto __matches = std::__count_if(__first2, __last2, |
| 3538 | __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan)); |
| 3539 | if (0 == __matches |
| 3540 | || std::__count_if(__scan, __last1, |
| 3541 | __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan)) |
| 3542 | != __matches) |
| 3543 | return false; |
| 3544 | } |
| 3545 | return true; |
| 3546 | } |
| 3547 | |
| 3548 | /** |
| 3549 | * @brief Checks whether a permutaion of the second sequence is equal |
| 3550 | * to the first sequence. |
| 3551 | * @ingroup non_mutating_algorithms |
| 3552 | * @param __first1 Start of first range. |
| 3553 | * @param __last1 End of first range. |
| 3554 | * @param __first2 Start of second range. |
| 3555 | * @param __last2 End of first range. |
| 3556 | * @return true if there exists a permutation of the elements in the range |
| 3557 | * [__first2, __last2), beginning with ForwardIterator2 begin, |
| 3558 | * such that equal(__first1, __last1, begin) returns true; |
| 3559 | * otherwise, returns false. |
| 3560 | */ |
| 3561 | template<typename _ForwardIterator1, typename _ForwardIterator2> |
| 3562 | _GLIBCXX20_CONSTEXPR |
| 3563 | inline bool |
| 3564 | is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 3565 | _ForwardIterator2 __first2, _ForwardIterator2 __last2) |
| 3566 | { |
| 3567 | __glibcxx_requires_valid_range(__first1, __last1); |
| 3568 | __glibcxx_requires_valid_range(__first2, __last2); |
| 3569 | |
| 3570 | return |
| 3571 | std::__is_permutation(__first1, __last1, __first2, __last2, |
| 3572 | __gnu_cxx::__ops::__iter_equal_to_iter()); |
| 3573 | } |
| 3574 | |
| 3575 | /** |
| 3576 | * @brief Checks whether a permutation of the second sequence is equal |
| 3577 | * to the first sequence. |
| 3578 | * @ingroup non_mutating_algorithms |
| 3579 | * @param __first1 Start of first range. |
| 3580 | * @param __last1 End of first range. |
| 3581 | * @param __first2 Start of second range. |
| 3582 | * @param __last2 End of first range. |
| 3583 | * @param __pred A binary predicate. |
| 3584 | * @return true if there exists a permutation of the elements in the range |
| 3585 | * [__first2, __last2), beginning with ForwardIterator2 begin, |
| 3586 | * such that equal(__first1, __last1, __begin, __pred) returns true; |
| 3587 | * otherwise, returns false. |
| 3588 | */ |
| 3589 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 3590 | typename _BinaryPredicate> |
| 3591 | _GLIBCXX20_CONSTEXPR |
| 3592 | inline bool |
| 3593 | is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 3594 | _ForwardIterator2 __first2, _ForwardIterator2 __last2, |
| 3595 | _BinaryPredicate __pred) |
| 3596 | { |
| 3597 | __glibcxx_requires_valid_range(__first1, __last1); |
| 3598 | __glibcxx_requires_valid_range(__first2, __last2); |
| 3599 | |
| 3600 | return std::__is_permutation(__first1, __last1, __first2, __last2, |
| 3601 | __gnu_cxx::__ops::__iter_comp_iter(__pred)); |
| 3602 | } |
| 3603 | |
| 3604 | #if __cplusplus >= 201703L |
| 3605 | |
| 3606 | #define __cpp_lib_clamp 201603L |
| 3607 | |
| 3608 | /** |
| 3609 | * @brief Returns the value clamped between lo and hi. |
| 3610 | * @ingroup sorting_algorithms |
| 3611 | * @param __val A value of arbitrary type. |
| 3612 | * @param __lo A lower limit of arbitrary type. |
| 3613 | * @param __hi An upper limit of arbitrary type. |
| 3614 | * @retval `__lo` if `__val < __lo` |
| 3615 | * @retval `__hi` if `__hi < __val` |
| 3616 | * @retval `__val` otherwise. |
| 3617 | * @pre `_Tp` is LessThanComparable and `(__hi < __lo)` is false. |
| 3618 | */ |
| 3619 | template<typename _Tp> |
| 3620 | constexpr const _Tp& |
| 3621 | clamp(const _Tp& __val, const _Tp& __lo, const _Tp& __hi) |
| 3622 | { |
| 3623 | __glibcxx_assert(!(__hi < __lo)); |
| 3624 | return std::min(std::max(__val, __lo), __hi); |
| 3625 | } |
| 3626 | |
| 3627 | /** |
| 3628 | * @brief Returns the value clamped between lo and hi. |
| 3629 | * @ingroup sorting_algorithms |
| 3630 | * @param __val A value of arbitrary type. |
| 3631 | * @param __lo A lower limit of arbitrary type. |
| 3632 | * @param __hi An upper limit of arbitrary type. |
| 3633 | * @param __comp A comparison functor. |
| 3634 | * @retval `__lo` if `__comp(__val, __lo)` |
| 3635 | * @retval `__hi` if `__comp(__hi, __val)` |
| 3636 | * @retval `__val` otherwise. |
| 3637 | * @pre `__comp(__hi, __lo)` is false. |
| 3638 | */ |
| 3639 | template<typename _Tp, typename _Compare> |
| 3640 | constexpr const _Tp& |
| 3641 | clamp(const _Tp& __val, const _Tp& __lo, const _Tp& __hi, _Compare __comp) |
| 3642 | { |
| 3643 | __glibcxx_assert(!__comp(__hi, __lo)); |
| 3644 | return std::min(std::max(__val, __lo, __comp), __hi, __comp); |
| 3645 | } |
| 3646 | #endif // C++17 |
| 3647 | #endif // C++14 |
| 3648 | |
| 3649 | #ifdef _GLIBCXX_USE_C99_STDINT_TR1 |
| 3650 | /** |
| 3651 | * @brief Generate two uniformly distributed integers using a |
| 3652 | * single distribution invocation. |
| 3653 | * @param __b0 The upper bound for the first integer. |
| 3654 | * @param __b1 The upper bound for the second integer. |
| 3655 | * @param __g A UniformRandomBitGenerator. |
| 3656 | * @return A pair (i, j) with i and j uniformly distributed |
| 3657 | * over [0, __b0) and [0, __b1), respectively. |
| 3658 | * |
| 3659 | * Requires: __b0 * __b1 <= __g.max() - __g.min(). |
| 3660 | * |
| 3661 | * Using uniform_int_distribution with a range that is very |
| 3662 | * small relative to the range of the generator ends up wasting |
| 3663 | * potentially expensively generated randomness, since |
| 3664 | * uniform_int_distribution does not store leftover randomness |
| 3665 | * between invocations. |
| 3666 | * |
| 3667 | * If we know we want two integers in ranges that are sufficiently |
| 3668 | * small, we can compose the ranges, use a single distribution |
| 3669 | * invocation, and significantly reduce the waste. |
| 3670 | */ |
| 3671 | template<typename _IntType, typename _UniformRandomBitGenerator> |
| 3672 | pair<_IntType, _IntType> |
| 3673 | __gen_two_uniform_ints(_IntType __b0, _IntType __b1, |
| 3674 | _UniformRandomBitGenerator&& __g) |
| 3675 | { |
| 3676 | _IntType __x |
| 3677 | = uniform_int_distribution<_IntType>{0, (__b0 * __b1) - 1}(__g); |
| 3678 | return std::make_pair(__x / __b1, __x % __b1); |
| 3679 | } |
| 3680 | |
| 3681 | /** |
| 3682 | * @brief Shuffle the elements of a sequence using a uniform random |
| 3683 | * number generator. |
| 3684 | * @ingroup mutating_algorithms |
| 3685 | * @param __first A forward iterator. |
| 3686 | * @param __last A forward iterator. |
| 3687 | * @param __g A UniformRandomNumberGenerator (26.5.1.3). |
| 3688 | * @return Nothing. |
| 3689 | * |
| 3690 | * Reorders the elements in the range @p [__first,__last) using @p __g to |
| 3691 | * provide random numbers. |
| 3692 | */ |
| 3693 | template<typename _RandomAccessIterator, |
| 3694 | typename _UniformRandomNumberGenerator> |
| 3695 | void |
| 3696 | shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 3697 | _UniformRandomNumberGenerator&& __g) |
| 3698 | { |
| 3699 | // concept requirements |
| 3700 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 3701 | _RandomAccessIterator>) |
| 3702 | __glibcxx_requires_valid_range(__first, __last); |
| 3703 | |
| 3704 | if (__first == __last) |
| 3705 | return; |
| 3706 | |
| 3707 | typedef typename iterator_traits<_RandomAccessIterator>::difference_type |
| 3708 | _DistanceType; |
| 3709 | |
| 3710 | typedef typename std::make_unsigned<_DistanceType>::type __ud_type; |
| 3711 | typedef typename std::uniform_int_distribution<__ud_type> __distr_type; |
| 3712 | typedef typename __distr_type::param_type __p_type; |
| 3713 | |
| 3714 | typedef typename remove_reference<_UniformRandomNumberGenerator>::type |
| 3715 | _Gen; |
| 3716 | typedef typename common_type<typename _Gen::result_type, __ud_type>::type |
| 3717 | __uc_type; |
| 3718 | |
| 3719 | const __uc_type __urngrange = __g.max() - __g.min(); |
| 3720 | const __uc_type __urange = __uc_type(__last - __first); |
| 3721 | |
| 3722 | if (__urngrange / __urange >= __urange) |
| 3723 | // I.e. (__urngrange >= __urange * __urange) but without wrap issues. |
| 3724 | { |
| 3725 | _RandomAccessIterator __i = __first + 1; |
| 3726 | |
| 3727 | // Since we know the range isn't empty, an even number of elements |
| 3728 | // means an uneven number of elements /to swap/, in which case we |
| 3729 | // do the first one up front: |
| 3730 | |
| 3731 | if ((__urange % 2) == 0) |
| 3732 | { |
| 3733 | __distr_type __d{0, 1}; |
| 3734 | std::iter_swap(__i++, __first + __d(__g)); |
| 3735 | } |
| 3736 | |
| 3737 | // Now we know that __last - __i is even, so we do the rest in pairs, |
| 3738 | // using a single distribution invocation to produce swap positions |
| 3739 | // for two successive elements at a time: |
| 3740 | |
| 3741 | while (__i != __last) |
| 3742 | { |
| 3743 | const __uc_type __swap_range = __uc_type(__i - __first) + 1; |
| 3744 | |
| 3745 | const pair<__uc_type, __uc_type> __pospos = |
| 3746 | __gen_two_uniform_ints(__swap_range, __swap_range + 1, __g); |
| 3747 | |
| 3748 | std::iter_swap(__i++, __first + __pospos.first); |
| 3749 | std::iter_swap(__i++, __first + __pospos.second); |
| 3750 | } |
| 3751 | |
| 3752 | return; |
| 3753 | } |
| 3754 | |
| 3755 | __distr_type __d; |
| 3756 | |
| 3757 | for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) |
| 3758 | std::iter_swap(__i, __first + __d(__g, __p_type(0, __i - __first))); |
| 3759 | } |
| 3760 | #endif // USE C99_STDINT |
| 3761 | |
| 3762 | #endif // C++11 |
| 3763 | |
| 3764 | _GLIBCXX_BEGIN_NAMESPACE_ALGO |
| 3765 | |
| 3766 | /** |
| 3767 | * @brief Apply a function to every element of a sequence. |
| 3768 | * @ingroup non_mutating_algorithms |
| 3769 | * @param __first An input iterator. |
| 3770 | * @param __last An input iterator. |
| 3771 | * @param __f A unary function object. |
| 3772 | * @return @p __f |
| 3773 | * |
| 3774 | * Applies the function object @p __f to each element in the range |
| 3775 | * @p [first,last). @p __f must not modify the order of the sequence. |
| 3776 | * If @p __f has a return value it is ignored. |
| 3777 | */ |
| 3778 | template<typename _InputIterator, typename _Function> |
| 3779 | _GLIBCXX20_CONSTEXPR |
| 3780 | _Function |
| 3781 | for_each(_InputIterator __first, _InputIterator __last, _Function __f) |
| 3782 | { |
| 3783 | // concept requirements |
| 3784 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3785 | __glibcxx_requires_valid_range(__first, __last); |
| 3786 | for (; __first != __last; ++__first) |
| 3787 | __f(*__first); |
| 3788 | return __f; // N.B. [alg.foreach] says std::move(f) but it's redundant. |
| 3789 | } |
| 3790 | |
| 3791 | #if __cplusplus >= 201703L |
| 3792 | /** |
| 3793 | * @brief Apply a function to every element of a sequence. |
| 3794 | * @ingroup non_mutating_algorithms |
| 3795 | * @param __first An input iterator. |
| 3796 | * @param __n A value convertible to an integer. |
| 3797 | * @param __f A unary function object. |
| 3798 | * @return `__first+__n` |
| 3799 | * |
| 3800 | * Applies the function object `__f` to each element in the range |
| 3801 | * `[first, first+n)`. `__f` must not modify the order of the sequence. |
| 3802 | * If `__f` has a return value it is ignored. |
| 3803 | */ |
| 3804 | template<typename _InputIterator, typename _Size, typename _Function> |
| 3805 | _GLIBCXX20_CONSTEXPR |
| 3806 | _InputIterator |
| 3807 | for_each_n(_InputIterator __first, _Size __n, _Function __f) |
| 3808 | { |
| 3809 | auto __n2 = std::__size_to_integer(__n); |
| 3810 | using _Cat = typename iterator_traits<_InputIterator>::iterator_category; |
| 3811 | if constexpr (is_base_of_v<random_access_iterator_tag, _Cat>) |
| 3812 | { |
| 3813 | if (__n2 <= 0) |
| 3814 | return __first; |
| 3815 | auto __last = __first + __n2; |
| 3816 | std::for_each(__first, __last, std::move(__f)); |
| 3817 | return __last; |
| 3818 | } |
| 3819 | else |
| 3820 | { |
| 3821 | while (__n2-->0) |
| 3822 | { |
| 3823 | __f(*__first); |
| 3824 | ++__first; |
| 3825 | } |
| 3826 | return __first; |
| 3827 | } |
| 3828 | } |
| 3829 | #endif // C++17 |
| 3830 | |
| 3831 | /** |
| 3832 | * @brief Find the first occurrence of a value in a sequence. |
| 3833 | * @ingroup non_mutating_algorithms |
| 3834 | * @param __first An input iterator. |
| 3835 | * @param __last An input iterator. |
| 3836 | * @param __val The value to find. |
| 3837 | * @return The first iterator @c i in the range @p [__first,__last) |
| 3838 | * such that @c *i == @p __val, or @p __last if no such iterator exists. |
| 3839 | */ |
| 3840 | template<typename _InputIterator, typename _Tp> |
| 3841 | _GLIBCXX20_CONSTEXPR |
| 3842 | inline _InputIterator |
| 3843 | find(_InputIterator __first, _InputIterator __last, |
| 3844 | const _Tp& __val) |
| 3845 | { |
| 3846 | // concept requirements |
| 3847 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3848 | __glibcxx_function_requires(_EqualOpConcept< |
| 3849 | typename iterator_traits<_InputIterator>::value_type, _Tp>) |
| 3850 | __glibcxx_requires_valid_range(__first, __last); |
| 3851 | return std::__find_if(__first, __last, |
| 3852 | __gnu_cxx::__ops::__iter_equals_val(__val)); |
| 3853 | } |
| 3854 | |
| 3855 | /** |
| 3856 | * @brief Find the first element in a sequence for which a |
| 3857 | * predicate is true. |
| 3858 | * @ingroup non_mutating_algorithms |
| 3859 | * @param __first An input iterator. |
| 3860 | * @param __last An input iterator. |
| 3861 | * @param __pred A predicate. |
| 3862 | * @return The first iterator @c i in the range @p [__first,__last) |
| 3863 | * such that @p __pred(*i) is true, or @p __last if no such iterator exists. |
| 3864 | */ |
| 3865 | template<typename _InputIterator, typename _Predicate> |
| 3866 | _GLIBCXX20_CONSTEXPR |
| 3867 | inline _InputIterator |
| 3868 | find_if(_InputIterator __first, _InputIterator __last, |
| 3869 | _Predicate __pred) |
| 3870 | { |
| 3871 | // concept requirements |
| 3872 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3873 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 3874 | typename iterator_traits<_InputIterator>::value_type>) |
| 3875 | __glibcxx_requires_valid_range(__first, __last); |
| 3876 | |
| 3877 | return std::__find_if(__first, __last, |
| 3878 | __gnu_cxx::__ops::__pred_iter(__pred)); |
| 3879 | } |
| 3880 | |
| 3881 | /** |
| 3882 | * @brief Find element from a set in a sequence. |
| 3883 | * @ingroup non_mutating_algorithms |
| 3884 | * @param __first1 Start of range to search. |
| 3885 | * @param __last1 End of range to search. |
| 3886 | * @param __first2 Start of match candidates. |
| 3887 | * @param __last2 End of match candidates. |
| 3888 | * @return The first iterator @c i in the range |
| 3889 | * @p [__first1,__last1) such that @c *i == @p *(i2) such that i2 is an |
| 3890 | * iterator in [__first2,__last2), or @p __last1 if no such iterator exists. |
| 3891 | * |
| 3892 | * Searches the range @p [__first1,__last1) for an element that is |
| 3893 | * equal to some element in the range [__first2,__last2). If |
| 3894 | * found, returns an iterator in the range [__first1,__last1), |
| 3895 | * otherwise returns @p __last1. |
| 3896 | */ |
| 3897 | template<typename _InputIterator, typename _ForwardIterator> |
| 3898 | _GLIBCXX20_CONSTEXPR |
| 3899 | _InputIterator |
| 3900 | find_first_of(_InputIterator __first1, _InputIterator __last1, |
| 3901 | _ForwardIterator __first2, _ForwardIterator __last2) |
| 3902 | { |
| 3903 | // concept requirements |
| 3904 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3905 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3906 | __glibcxx_function_requires(_EqualOpConcept< |
| 3907 | typename iterator_traits<_InputIterator>::value_type, |
| 3908 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3909 | __glibcxx_requires_valid_range(__first1, __last1); |
| 3910 | __glibcxx_requires_valid_range(__first2, __last2); |
| 3911 | |
| 3912 | for (; __first1 != __last1; ++__first1) |
| 3913 | for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter) |
| 3914 | if (*__first1 == *__iter) |
| 3915 | return __first1; |
| 3916 | return __last1; |
| 3917 | } |
| 3918 | |
| 3919 | /** |
| 3920 | * @brief Find element from a set in a sequence using a predicate. |
| 3921 | * @ingroup non_mutating_algorithms |
| 3922 | * @param __first1 Start of range to search. |
| 3923 | * @param __last1 End of range to search. |
| 3924 | * @param __first2 Start of match candidates. |
| 3925 | * @param __last2 End of match candidates. |
| 3926 | * @param __comp Predicate to use. |
| 3927 | * @return The first iterator @c i in the range |
| 3928 | * @p [__first1,__last1) such that @c comp(*i, @p *(i2)) is true |
| 3929 | * and i2 is an iterator in [__first2,__last2), or @p __last1 if no |
| 3930 | * such iterator exists. |
| 3931 | * |
| 3932 | |
| 3933 | * Searches the range @p [__first1,__last1) for an element that is |
| 3934 | * equal to some element in the range [__first2,__last2). If |
| 3935 | * found, returns an iterator in the range [__first1,__last1), |
| 3936 | * otherwise returns @p __last1. |
| 3937 | */ |
| 3938 | template<typename _InputIterator, typename _ForwardIterator, |
| 3939 | typename _BinaryPredicate> |
| 3940 | _GLIBCXX20_CONSTEXPR |
| 3941 | _InputIterator |
| 3942 | find_first_of(_InputIterator __first1, _InputIterator __last1, |
| 3943 | _ForwardIterator __first2, _ForwardIterator __last2, |
| 3944 | _BinaryPredicate __comp) |
| 3945 | { |
| 3946 | // concept requirements |
| 3947 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 3948 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3949 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 3950 | typename iterator_traits<_InputIterator>::value_type, |
| 3951 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3952 | __glibcxx_requires_valid_range(__first1, __last1); |
| 3953 | __glibcxx_requires_valid_range(__first2, __last2); |
| 3954 | |
| 3955 | for (; __first1 != __last1; ++__first1) |
| 3956 | for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter) |
| 3957 | if (__comp(*__first1, *__iter)) |
| 3958 | return __first1; |
| 3959 | return __last1; |
| 3960 | } |
| 3961 | |
| 3962 | /** |
| 3963 | * @brief Find two adjacent values in a sequence that are equal. |
| 3964 | * @ingroup non_mutating_algorithms |
| 3965 | * @param __first A forward iterator. |
| 3966 | * @param __last A forward iterator. |
| 3967 | * @return The first iterator @c i such that @c i and @c i+1 are both |
| 3968 | * valid iterators in @p [__first,__last) and such that @c *i == @c *(i+1), |
| 3969 | * or @p __last if no such iterator exists. |
| 3970 | */ |
| 3971 | template<typename _ForwardIterator> |
| 3972 | _GLIBCXX20_CONSTEXPR |
| 3973 | inline _ForwardIterator |
| 3974 | adjacent_find(_ForwardIterator __first, _ForwardIterator __last) |
| 3975 | { |
| 3976 | // concept requirements |
| 3977 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 3978 | __glibcxx_function_requires(_EqualityComparableConcept< |
| 3979 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 3980 | __glibcxx_requires_valid_range(__first, __last); |
| 3981 | |
| 3982 | return std::__adjacent_find(__first, __last, |
| 3983 | __gnu_cxx::__ops::__iter_equal_to_iter()); |
| 3984 | } |
| 3985 | |
| 3986 | /** |
| 3987 | * @brief Find two adjacent values in a sequence using a predicate. |
| 3988 | * @ingroup non_mutating_algorithms |
| 3989 | * @param __first A forward iterator. |
| 3990 | * @param __last A forward iterator. |
| 3991 | * @param __binary_pred A binary predicate. |
| 3992 | * @return The first iterator @c i such that @c i and @c i+1 are both |
| 3993 | * valid iterators in @p [__first,__last) and such that |
| 3994 | * @p __binary_pred(*i,*(i+1)) is true, or @p __last if no such iterator |
| 3995 | * exists. |
| 3996 | */ |
| 3997 | template<typename _ForwardIterator, typename _BinaryPredicate> |
| 3998 | _GLIBCXX20_CONSTEXPR |
| 3999 | inline _ForwardIterator |
| 4000 | adjacent_find(_ForwardIterator __first, _ForwardIterator __last, |
| 4001 | _BinaryPredicate __binary_pred) |
| 4002 | { |
| 4003 | // concept requirements |
| 4004 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 4005 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 4006 | typename iterator_traits<_ForwardIterator>::value_type, |
| 4007 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 4008 | __glibcxx_requires_valid_range(__first, __last); |
| 4009 | |
| 4010 | return std::__adjacent_find(__first, __last, |
| 4011 | __gnu_cxx::__ops::__iter_comp_iter(__binary_pred)); |
| 4012 | } |
| 4013 | |
| 4014 | /** |
| 4015 | * @brief Count the number of copies of a value in a sequence. |
| 4016 | * @ingroup non_mutating_algorithms |
| 4017 | * @param __first An input iterator. |
| 4018 | * @param __last An input iterator. |
| 4019 | * @param __value The value to be counted. |
| 4020 | * @return The number of iterators @c i in the range @p [__first,__last) |
| 4021 | * for which @c *i == @p __value |
| 4022 | */ |
| 4023 | template<typename _InputIterator, typename _Tp> |
| 4024 | _GLIBCXX20_CONSTEXPR |
| 4025 | inline typename iterator_traits<_InputIterator>::difference_type |
| 4026 | count(_InputIterator __first, _InputIterator __last, const _Tp& __value) |
| 4027 | { |
| 4028 | // concept requirements |
| 4029 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 4030 | __glibcxx_function_requires(_EqualOpConcept< |
| 4031 | typename iterator_traits<_InputIterator>::value_type, _Tp>) |
| 4032 | __glibcxx_requires_valid_range(__first, __last); |
| 4033 | |
| 4034 | return std::__count_if(__first, __last, |
| 4035 | __gnu_cxx::__ops::__iter_equals_val(__value)); |
| 4036 | } |
| 4037 | |
| 4038 | /** |
| 4039 | * @brief Count the elements of a sequence for which a predicate is true. |
| 4040 | * @ingroup non_mutating_algorithms |
| 4041 | * @param __first An input iterator. |
| 4042 | * @param __last An input iterator. |
| 4043 | * @param __pred A predicate. |
| 4044 | * @return The number of iterators @c i in the range @p [__first,__last) |
| 4045 | * for which @p __pred(*i) is true. |
| 4046 | */ |
| 4047 | template<typename _InputIterator, typename _Predicate> |
| 4048 | _GLIBCXX20_CONSTEXPR |
| 4049 | inline typename iterator_traits<_InputIterator>::difference_type |
| 4050 | count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred) |
| 4051 | { |
| 4052 | // concept requirements |
| 4053 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 4054 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 4055 | typename iterator_traits<_InputIterator>::value_type>) |
| 4056 | __glibcxx_requires_valid_range(__first, __last); |
| 4057 | |
| 4058 | return std::__count_if(__first, __last, |
| 4059 | __gnu_cxx::__ops::__pred_iter(__pred)); |
| 4060 | } |
| 4061 | |
| 4062 | /** |
| 4063 | * @brief Search a sequence for a matching sub-sequence. |
| 4064 | * @ingroup non_mutating_algorithms |
| 4065 | * @param __first1 A forward iterator. |
| 4066 | * @param __last1 A forward iterator. |
| 4067 | * @param __first2 A forward iterator. |
| 4068 | * @param __last2 A forward iterator. |
| 4069 | * @return The first iterator @c i in the range @p |
| 4070 | * [__first1,__last1-(__last2-__first2)) such that @c *(i+N) == @p |
| 4071 | * *(__first2+N) for each @c N in the range @p |
| 4072 | * [0,__last2-__first2), or @p __last1 if no such iterator exists. |
| 4073 | * |
| 4074 | * Searches the range @p [__first1,__last1) for a sub-sequence that |
| 4075 | * compares equal value-by-value with the sequence given by @p |
| 4076 | * [__first2,__last2) and returns an iterator to the first element |
| 4077 | * of the sub-sequence, or @p __last1 if the sub-sequence is not |
| 4078 | * found. |
| 4079 | * |
| 4080 | * Because the sub-sequence must lie completely within the range @p |
| 4081 | * [__first1,__last1) it must start at a position less than @p |
| 4082 | * __last1-(__last2-__first2) where @p __last2-__first2 is the |
| 4083 | * length of the sub-sequence. |
| 4084 | * |
| 4085 | * This means that the returned iterator @c i will be in the range |
| 4086 | * @p [__first1,__last1-(__last2-__first2)) |
| 4087 | */ |
| 4088 | template<typename _ForwardIterator1, typename _ForwardIterator2> |
| 4089 | _GLIBCXX20_CONSTEXPR |
| 4090 | inline _ForwardIterator1 |
| 4091 | search(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 4092 | _ForwardIterator2 __first2, _ForwardIterator2 __last2) |
| 4093 | { |
| 4094 | // concept requirements |
| 4095 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) |
| 4096 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) |
| 4097 | __glibcxx_function_requires(_EqualOpConcept< |
| 4098 | typename iterator_traits<_ForwardIterator1>::value_type, |
| 4099 | typename iterator_traits<_ForwardIterator2>::value_type>) |
| 4100 | __glibcxx_requires_valid_range(__first1, __last1); |
| 4101 | __glibcxx_requires_valid_range(__first2, __last2); |
| 4102 | |
| 4103 | return std::__search(__first1, __last1, __first2, __last2, |
| 4104 | __gnu_cxx::__ops::__iter_equal_to_iter()); |
| 4105 | } |
| 4106 | |
| 4107 | /** |
| 4108 | * @brief Search a sequence for a matching sub-sequence using a predicate. |
| 4109 | * @ingroup non_mutating_algorithms |
| 4110 | * @param __first1 A forward iterator. |
| 4111 | * @param __last1 A forward iterator. |
| 4112 | * @param __first2 A forward iterator. |
| 4113 | * @param __last2 A forward iterator. |
| 4114 | * @param __predicate A binary predicate. |
| 4115 | * @return The first iterator @c i in the range |
| 4116 | * @p [__first1,__last1-(__last2-__first2)) such that |
| 4117 | * @p __predicate(*(i+N),*(__first2+N)) is true for each @c N in the range |
| 4118 | * @p [0,__last2-__first2), or @p __last1 if no such iterator exists. |
| 4119 | * |
| 4120 | * Searches the range @p [__first1,__last1) for a sub-sequence that |
| 4121 | * compares equal value-by-value with the sequence given by @p |
| 4122 | * [__first2,__last2), using @p __predicate to determine equality, |
| 4123 | * and returns an iterator to the first element of the |
| 4124 | * sub-sequence, or @p __last1 if no such iterator exists. |
| 4125 | * |
| 4126 | * @see search(_ForwardIter1, _ForwardIter1, _ForwardIter2, _ForwardIter2) |
| 4127 | */ |
| 4128 | template<typename _ForwardIterator1, typename _ForwardIterator2, |
| 4129 | typename _BinaryPredicate> |
| 4130 | _GLIBCXX20_CONSTEXPR |
| 4131 | inline _ForwardIterator1 |
| 4132 | search(_ForwardIterator1 __first1, _ForwardIterator1 __last1, |
| 4133 | _ForwardIterator2 __first2, _ForwardIterator2 __last2, |
| 4134 | _BinaryPredicate __predicate) |
| 4135 | { |
| 4136 | // concept requirements |
| 4137 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>) |
| 4138 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>) |
| 4139 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 4140 | typename iterator_traits<_ForwardIterator1>::value_type, |
| 4141 | typename iterator_traits<_ForwardIterator2>::value_type>) |
| 4142 | __glibcxx_requires_valid_range(__first1, __last1); |
| 4143 | __glibcxx_requires_valid_range(__first2, __last2); |
| 4144 | |
| 4145 | return std::__search(__first1, __last1, __first2, __last2, |
| 4146 | __gnu_cxx::__ops::__iter_comp_iter(__predicate)); |
| 4147 | } |
| 4148 | |
| 4149 | /** |
| 4150 | * @brief Search a sequence for a number of consecutive values. |
| 4151 | * @ingroup non_mutating_algorithms |
| 4152 | * @param __first A forward iterator. |
| 4153 | * @param __last A forward iterator. |
| 4154 | * @param __count The number of consecutive values. |
| 4155 | * @param __val The value to find. |
| 4156 | * @return The first iterator @c i in the range @p |
| 4157 | * [__first,__last-__count) such that @c *(i+N) == @p __val for |
| 4158 | * each @c N in the range @p [0,__count), or @p __last if no such |
| 4159 | * iterator exists. |
| 4160 | * |
| 4161 | * Searches the range @p [__first,__last) for @p count consecutive elements |
| 4162 | * equal to @p __val. |
| 4163 | */ |
| 4164 | template<typename _ForwardIterator, typename _Integer, typename _Tp> |
| 4165 | _GLIBCXX20_CONSTEXPR |
| 4166 | inline _ForwardIterator |
| 4167 | search_n(_ForwardIterator __first, _ForwardIterator __last, |
| 4168 | _Integer __count, const _Tp& __val) |
| 4169 | { |
| 4170 | // concept requirements |
| 4171 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 4172 | __glibcxx_function_requires(_EqualOpConcept< |
| 4173 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 4174 | __glibcxx_requires_valid_range(__first, __last); |
| 4175 | |
| 4176 | return std::__search_n(__first, __last, __count, |
| 4177 | __gnu_cxx::__ops::__iter_equals_val(__val)); |
| 4178 | } |
| 4179 | |
| 4180 | |
| 4181 | /** |
| 4182 | * @brief Search a sequence for a number of consecutive values using a |
| 4183 | * predicate. |
| 4184 | * @ingroup non_mutating_algorithms |
| 4185 | * @param __first A forward iterator. |
| 4186 | * @param __last A forward iterator. |
| 4187 | * @param __count The number of consecutive values. |
| 4188 | * @param __val The value to find. |
| 4189 | * @param __binary_pred A binary predicate. |
| 4190 | * @return The first iterator @c i in the range @p |
| 4191 | * [__first,__last-__count) such that @p |
| 4192 | * __binary_pred(*(i+N),__val) is true for each @c N in the range |
| 4193 | * @p [0,__count), or @p __last if no such iterator exists. |
| 4194 | * |
| 4195 | * Searches the range @p [__first,__last) for @p __count |
| 4196 | * consecutive elements for which the predicate returns true. |
| 4197 | */ |
| 4198 | template<typename _ForwardIterator, typename _Integer, typename _Tp, |
| 4199 | typename _BinaryPredicate> |
| 4200 | _GLIBCXX20_CONSTEXPR |
| 4201 | inline _ForwardIterator |
| 4202 | search_n(_ForwardIterator __first, _ForwardIterator __last, |
| 4203 | _Integer __count, const _Tp& __val, |
| 4204 | _BinaryPredicate __binary_pred) |
| 4205 | { |
| 4206 | // concept requirements |
| 4207 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 4208 | __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate, |
| 4209 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 4210 | __glibcxx_requires_valid_range(__first, __last); |
| 4211 | |
| 4212 | return std::__search_n(__first, __last, __count, |
| 4213 | __gnu_cxx::__ops::__iter_comp_val(__binary_pred, __val)); |
| 4214 | } |
| 4215 | |
| 4216 | #if __cplusplus >= 201703L |
| 4217 | /** @brief Search a sequence using a Searcher object. |
| 4218 | * |
| 4219 | * @param __first A forward iterator. |
| 4220 | * @param __last A forward iterator. |
| 4221 | * @param __searcher A callable object. |
| 4222 | * @return @p __searcher(__first,__last).first |
| 4223 | */ |
| 4224 | template<typename _ForwardIterator, typename _Searcher> |
| 4225 | _GLIBCXX20_CONSTEXPR |
| 4226 | inline _ForwardIterator |
| 4227 | search(_ForwardIterator __first, _ForwardIterator __last, |
| 4228 | const _Searcher& __searcher) |
| 4229 | { return __searcher(__first, __last).first; } |
| 4230 | #endif |
| 4231 | |
| 4232 | /** |
| 4233 | * @brief Perform an operation on a sequence. |
| 4234 | * @ingroup mutating_algorithms |
| 4235 | * @param __first An input iterator. |
| 4236 | * @param __last An input iterator. |
| 4237 | * @param __result An output iterator. |
| 4238 | * @param __unary_op A unary operator. |
| 4239 | * @return An output iterator equal to @p __result+(__last-__first). |
| 4240 | * |
| 4241 | * Applies the operator to each element in the input range and assigns |
| 4242 | * the results to successive elements of the output sequence. |
| 4243 | * Evaluates @p *(__result+N)=unary_op(*(__first+N)) for each @c N in the |
| 4244 | * range @p [0,__last-__first). |
| 4245 | * |
| 4246 | * @p unary_op must not alter its argument. |
| 4247 | */ |
| 4248 | template<typename _InputIterator, typename _OutputIterator, |
| 4249 | typename _UnaryOperation> |
| 4250 | _GLIBCXX20_CONSTEXPR |
| 4251 | _OutputIterator |
| 4252 | transform(_InputIterator __first, _InputIterator __last, |
| 4253 | _OutputIterator __result, _UnaryOperation __unary_op) |
| 4254 | { |
| 4255 | // concept requirements |
| 4256 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 4257 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4258 | // "the type returned by a _UnaryOperation" |
| 4259 | __typeof__(__unary_op(*__first))>) |
| 4260 | __glibcxx_requires_valid_range(__first, __last); |
| 4261 | |
| 4262 | for (; __first != __last; ++__first, (void)++__result) |
| 4263 | *__result = __unary_op(*__first); |
| 4264 | return __result; |
| 4265 | } |
| 4266 | |
| 4267 | /** |
| 4268 | * @brief Perform an operation on corresponding elements of two sequences. |
| 4269 | * @ingroup mutating_algorithms |
| 4270 | * @param __first1 An input iterator. |
| 4271 | * @param __last1 An input iterator. |
| 4272 | * @param __first2 An input iterator. |
| 4273 | * @param __result An output iterator. |
| 4274 | * @param __binary_op A binary operator. |
| 4275 | * @return An output iterator equal to @p result+(last-first). |
| 4276 | * |
| 4277 | * Applies the operator to the corresponding elements in the two |
| 4278 | * input ranges and assigns the results to successive elements of the |
| 4279 | * output sequence. |
| 4280 | * Evaluates @p |
| 4281 | * *(__result+N)=__binary_op(*(__first1+N),*(__first2+N)) for each |
| 4282 | * @c N in the range @p [0,__last1-__first1). |
| 4283 | * |
| 4284 | * @p binary_op must not alter either of its arguments. |
| 4285 | */ |
| 4286 | template<typename _InputIterator1, typename _InputIterator2, |
| 4287 | typename _OutputIterator, typename _BinaryOperation> |
| 4288 | _GLIBCXX20_CONSTEXPR |
| 4289 | _OutputIterator |
| 4290 | transform(_InputIterator1 __first1, _InputIterator1 __last1, |
| 4291 | _InputIterator2 __first2, _OutputIterator __result, |
| 4292 | _BinaryOperation __binary_op) |
| 4293 | { |
| 4294 | // concept requirements |
| 4295 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 4296 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 4297 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4298 | // "the type returned by a _BinaryOperation" |
| 4299 | __typeof__(__binary_op(*__first1,*__first2))>) |
| 4300 | __glibcxx_requires_valid_range(__first1, __last1); |
| 4301 | |
| 4302 | for (; __first1 != __last1; ++__first1, (void)++__first2, ++__result) |
| 4303 | *__result = __binary_op(*__first1, *__first2); |
| 4304 | return __result; |
| 4305 | } |
| 4306 | |
| 4307 | /** |
| 4308 | * @brief Replace each occurrence of one value in a sequence with another |
| 4309 | * value. |
| 4310 | * @ingroup mutating_algorithms |
| 4311 | * @param __first A forward iterator. |
| 4312 | * @param __last A forward iterator. |
| 4313 | * @param __old_value The value to be replaced. |
| 4314 | * @param __new_value The replacement value. |
| 4315 | * @return replace() returns no value. |
| 4316 | * |
| 4317 | * For each iterator @c i in the range @p [__first,__last) if @c *i == |
| 4318 | * @p __old_value then the assignment @c *i = @p __new_value is performed. |
| 4319 | */ |
| 4320 | template<typename _ForwardIterator, typename _Tp> |
| 4321 | _GLIBCXX20_CONSTEXPR |
| 4322 | void |
| 4323 | replace(_ForwardIterator __first, _ForwardIterator __last, |
| 4324 | const _Tp& __old_value, const _Tp& __new_value) |
| 4325 | { |
| 4326 | // concept requirements |
| 4327 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 4328 | _ForwardIterator>) |
| 4329 | __glibcxx_function_requires(_EqualOpConcept< |
| 4330 | typename iterator_traits<_ForwardIterator>::value_type, _Tp>) |
| 4331 | __glibcxx_function_requires(_ConvertibleConcept<_Tp, |
| 4332 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 4333 | __glibcxx_requires_valid_range(__first, __last); |
| 4334 | |
| 4335 | for (; __first != __last; ++__first) |
| 4336 | if (*__first == __old_value) |
| 4337 | *__first = __new_value; |
| 4338 | } |
| 4339 | |
| 4340 | /** |
| 4341 | * @brief Replace each value in a sequence for which a predicate returns |
| 4342 | * true with another value. |
| 4343 | * @ingroup mutating_algorithms |
| 4344 | * @param __first A forward iterator. |
| 4345 | * @param __last A forward iterator. |
| 4346 | * @param __pred A predicate. |
| 4347 | * @param __new_value The replacement value. |
| 4348 | * @return replace_if() returns no value. |
| 4349 | * |
| 4350 | * For each iterator @c i in the range @p [__first,__last) if @p __pred(*i) |
| 4351 | * is true then the assignment @c *i = @p __new_value is performed. |
| 4352 | */ |
| 4353 | template<typename _ForwardIterator, typename _Predicate, typename _Tp> |
| 4354 | _GLIBCXX20_CONSTEXPR |
| 4355 | void |
| 4356 | replace_if(_ForwardIterator __first, _ForwardIterator __last, |
| 4357 | _Predicate __pred, const _Tp& __new_value) |
| 4358 | { |
| 4359 | // concept requirements |
| 4360 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 4361 | _ForwardIterator>) |
| 4362 | __glibcxx_function_requires(_ConvertibleConcept<_Tp, |
| 4363 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 4364 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 4365 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 4366 | __glibcxx_requires_valid_range(__first, __last); |
| 4367 | |
| 4368 | for (; __first != __last; ++__first) |
| 4369 | if (__pred(*__first)) |
| 4370 | *__first = __new_value; |
| 4371 | } |
| 4372 | |
| 4373 | /** |
| 4374 | * @brief Assign the result of a function object to each value in a |
| 4375 | * sequence. |
| 4376 | * @ingroup mutating_algorithms |
| 4377 | * @param __first A forward iterator. |
| 4378 | * @param __last A forward iterator. |
| 4379 | * @param __gen A function object taking no arguments and returning |
| 4380 | * std::iterator_traits<_ForwardIterator>::value_type |
| 4381 | * @return generate() returns no value. |
| 4382 | * |
| 4383 | * Performs the assignment @c *i = @p __gen() for each @c i in the range |
| 4384 | * @p [__first,__last). |
| 4385 | */ |
| 4386 | template<typename _ForwardIterator, typename _Generator> |
| 4387 | _GLIBCXX20_CONSTEXPR |
| 4388 | void |
| 4389 | generate(_ForwardIterator __first, _ForwardIterator __last, |
| 4390 | _Generator __gen) |
| 4391 | { |
| 4392 | // concept requirements |
| 4393 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 4394 | __glibcxx_function_requires(_GeneratorConcept<_Generator, |
| 4395 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 4396 | __glibcxx_requires_valid_range(__first, __last); |
| 4397 | |
| 4398 | for (; __first != __last; ++__first) |
| 4399 | *__first = __gen(); |
| 4400 | } |
| 4401 | |
| 4402 | /** |
| 4403 | * @brief Assign the result of a function object to each value in a |
| 4404 | * sequence. |
| 4405 | * @ingroup mutating_algorithms |
| 4406 | * @param __first A forward iterator. |
| 4407 | * @param __n The length of the sequence. |
| 4408 | * @param __gen A function object taking no arguments and returning |
| 4409 | * std::iterator_traits<_ForwardIterator>::value_type |
| 4410 | * @return The end of the sequence, @p __first+__n |
| 4411 | * |
| 4412 | * Performs the assignment @c *i = @p __gen() for each @c i in the range |
| 4413 | * @p [__first,__first+__n). |
| 4414 | * |
| 4415 | * If @p __n is negative, the function does nothing and returns @p __first. |
| 4416 | */ |
| 4417 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4418 | // DR 865. More algorithms that throw away information |
| 4419 | // DR 426. search_n(), fill_n(), and generate_n() with negative n |
| 4420 | template<typename _OutputIterator, typename _Size, typename _Generator> |
| 4421 | _GLIBCXX20_CONSTEXPR |
| 4422 | _OutputIterator |
| 4423 | generate_n(_OutputIterator __first, _Size __n, _Generator __gen) |
| 4424 | { |
| 4425 | // concept requirements |
| 4426 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4427 | // "the type returned by a _Generator" |
| 4428 | __typeof__(__gen())>) |
| 4429 | |
| 4430 | typedef __decltype(std::__size_to_integer(__n)) _IntSize; |
| 4431 | for (_IntSize __niter = std::__size_to_integer(__n); |
| 4432 | __niter > 0; --__niter, (void) ++__first) |
| 4433 | *__first = __gen(); |
| 4434 | return __first; |
| 4435 | } |
| 4436 | |
| 4437 | /** |
| 4438 | * @brief Copy a sequence, removing consecutive duplicate values. |
| 4439 | * @ingroup mutating_algorithms |
| 4440 | * @param __first An input iterator. |
| 4441 | * @param __last An input iterator. |
| 4442 | * @param __result An output iterator. |
| 4443 | * @return An iterator designating the end of the resulting sequence. |
| 4444 | * |
| 4445 | * Copies each element in the range @p [__first,__last) to the range |
| 4446 | * beginning at @p __result, except that only the first element is copied |
| 4447 | * from groups of consecutive elements that compare equal. |
| 4448 | * unique_copy() is stable, so the relative order of elements that are |
| 4449 | * copied is unchanged. |
| 4450 | * |
| 4451 | * _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4452 | * DR 241. Does unique_copy() require CopyConstructible and Assignable? |
| 4453 | * |
| 4454 | * _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4455 | * DR 538. 241 again: Does unique_copy() require CopyConstructible and |
| 4456 | * Assignable? |
| 4457 | */ |
| 4458 | template<typename _InputIterator, typename _OutputIterator> |
| 4459 | _GLIBCXX20_CONSTEXPR |
| 4460 | inline _OutputIterator |
| 4461 | unique_copy(_InputIterator __first, _InputIterator __last, |
| 4462 | _OutputIterator __result) |
| 4463 | { |
| 4464 | // concept requirements |
| 4465 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 4466 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4467 | typename iterator_traits<_InputIterator>::value_type>) |
| 4468 | __glibcxx_function_requires(_EqualityComparableConcept< |
| 4469 | typename iterator_traits<_InputIterator>::value_type>) |
| 4470 | __glibcxx_requires_valid_range(__first, __last); |
| 4471 | |
| 4472 | if (__first == __last) |
| 4473 | return __result; |
| 4474 | return std::__unique_copy(__first, __last, __result, |
| 4475 | __gnu_cxx::__ops::__iter_equal_to_iter(), |
| 4476 | std::__iterator_category(__first), |
| 4477 | std::__iterator_category(__result)); |
| 4478 | } |
| 4479 | |
| 4480 | /** |
| 4481 | * @brief Copy a sequence, removing consecutive values using a predicate. |
| 4482 | * @ingroup mutating_algorithms |
| 4483 | * @param __first An input iterator. |
| 4484 | * @param __last An input iterator. |
| 4485 | * @param __result An output iterator. |
| 4486 | * @param __binary_pred A binary predicate. |
| 4487 | * @return An iterator designating the end of the resulting sequence. |
| 4488 | * |
| 4489 | * Copies each element in the range @p [__first,__last) to the range |
| 4490 | * beginning at @p __result, except that only the first element is copied |
| 4491 | * from groups of consecutive elements for which @p __binary_pred returns |
| 4492 | * true. |
| 4493 | * unique_copy() is stable, so the relative order of elements that are |
| 4494 | * copied is unchanged. |
| 4495 | * |
| 4496 | * _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4497 | * DR 241. Does unique_copy() require CopyConstructible and Assignable? |
| 4498 | */ |
| 4499 | template<typename _InputIterator, typename _OutputIterator, |
| 4500 | typename _BinaryPredicate> |
| 4501 | _GLIBCXX20_CONSTEXPR |
| 4502 | inline _OutputIterator |
| 4503 | unique_copy(_InputIterator __first, _InputIterator __last, |
| 4504 | _OutputIterator __result, |
| 4505 | _BinaryPredicate __binary_pred) |
| 4506 | { |
| 4507 | // concept requirements -- predicates checked later |
| 4508 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) |
| 4509 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4510 | typename iterator_traits<_InputIterator>::value_type>) |
| 4511 | __glibcxx_requires_valid_range(__first, __last); |
| 4512 | |
| 4513 | if (__first == __last) |
| 4514 | return __result; |
| 4515 | return std::__unique_copy(__first, __last, __result, |
| 4516 | __gnu_cxx::__ops::__iter_comp_iter(__binary_pred), |
| 4517 | std::__iterator_category(__first), |
| 4518 | std::__iterator_category(__result)); |
| 4519 | } |
| 4520 | |
| 4521 | #if __cplusplus <= 201103L || _GLIBCXX_USE_DEPRECATED |
| 4522 | #if _GLIBCXX_HOSTED |
| 4523 | /** |
| 4524 | * @brief Randomly shuffle the elements of a sequence. |
| 4525 | * @ingroup mutating_algorithms |
| 4526 | * @param __first A forward iterator. |
| 4527 | * @param __last A forward iterator. |
| 4528 | * @return Nothing. |
| 4529 | * |
| 4530 | * Reorder the elements in the range @p [__first,__last) using a random |
| 4531 | * distribution, so that every possible ordering of the sequence is |
| 4532 | * equally likely. |
| 4533 | * |
| 4534 | * @deprecated |
| 4535 | * Since C++14 `std::random_shuffle` is not part of the C++ standard. |
| 4536 | * Use `std::shuffle` instead, which was introduced in C++11. |
| 4537 | */ |
| 4538 | template<typename _RandomAccessIterator> |
| 4539 | _GLIBCXX14_DEPRECATED_SUGGEST("std::shuffle") |
| 4540 | inline void |
| 4541 | random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last) |
| 4542 | { |
| 4543 | // concept requirements |
| 4544 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4545 | _RandomAccessIterator>) |
| 4546 | __glibcxx_requires_valid_range(__first, __last); |
| 4547 | |
| 4548 | if (__first != __last) |
| 4549 | for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) |
| 4550 | { |
| 4551 | // XXX rand() % N is not uniformly distributed |
| 4552 | _RandomAccessIterator __j = __first |
| 4553 | + std::rand() % ((__i - __first) + 1); |
| 4554 | if (__i != __j) |
| 4555 | std::iter_swap(__i, __j); |
| 4556 | } |
| 4557 | } |
| 4558 | #endif |
| 4559 | |
| 4560 | /** |
| 4561 | * @brief Shuffle the elements of a sequence using a random number |
| 4562 | * generator. |
| 4563 | * @ingroup mutating_algorithms |
| 4564 | * @param __first A forward iterator. |
| 4565 | * @param __last A forward iterator. |
| 4566 | * @param __rand The RNG functor or function. |
| 4567 | * @return Nothing. |
| 4568 | * |
| 4569 | * Reorders the elements in the range @p [__first,__last) using @p __rand to |
| 4570 | * provide a random distribution. Calling @p __rand(N) for a positive |
| 4571 | * integer @p N should return a randomly chosen integer from the |
| 4572 | * range [0,N). |
| 4573 | * |
| 4574 | * @deprecated |
| 4575 | * Since C++14 `std::random_shuffle` is not part of the C++ standard. |
| 4576 | * Use `std::shuffle` instead, which was introduced in C++11. |
| 4577 | */ |
| 4578 | template<typename _RandomAccessIterator, typename _RandomNumberGenerator> |
| 4579 | _GLIBCXX14_DEPRECATED_SUGGEST("std::shuffle") |
| 4580 | void |
| 4581 | random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 4582 | #if __cplusplus >= 201103L |
| 4583 | _RandomNumberGenerator&& __rand) |
| 4584 | #else |
| 4585 | _RandomNumberGenerator& __rand) |
| 4586 | #endif |
| 4587 | { |
| 4588 | // concept requirements |
| 4589 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4590 | _RandomAccessIterator>) |
| 4591 | __glibcxx_requires_valid_range(__first, __last); |
| 4592 | |
| 4593 | if (__first == __last) |
| 4594 | return; |
| 4595 | for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i) |
| 4596 | { |
| 4597 | _RandomAccessIterator __j = __first + __rand((__i - __first) + 1); |
| 4598 | if (__i != __j) |
| 4599 | std::iter_swap(__i, __j); |
| 4600 | } |
| 4601 | } |
| 4602 | #endif // C++11 || USE_DEPRECATED |
| 4603 | |
| 4604 | /** |
| 4605 | * @brief Move elements for which a predicate is true to the beginning |
| 4606 | * of a sequence. |
| 4607 | * @ingroup mutating_algorithms |
| 4608 | * @param __first A forward iterator. |
| 4609 | * @param __last A forward iterator. |
| 4610 | * @param __pred A predicate functor. |
| 4611 | * @return An iterator @p middle such that @p __pred(i) is true for each |
| 4612 | * iterator @p i in the range @p [__first,middle) and false for each @p i |
| 4613 | * in the range @p [middle,__last). |
| 4614 | * |
| 4615 | * @p __pred must not modify its operand. @p partition() does not preserve |
| 4616 | * the relative ordering of elements in each group, use |
| 4617 | * @p stable_partition() if this is needed. |
| 4618 | */ |
| 4619 | template<typename _ForwardIterator, typename _Predicate> |
| 4620 | _GLIBCXX20_CONSTEXPR |
| 4621 | inline _ForwardIterator |
| 4622 | partition(_ForwardIterator __first, _ForwardIterator __last, |
| 4623 | _Predicate __pred) |
| 4624 | { |
| 4625 | // concept requirements |
| 4626 | __glibcxx_function_requires(_Mutable_ForwardIteratorConcept< |
| 4627 | _ForwardIterator>) |
| 4628 | __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, |
| 4629 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 4630 | __glibcxx_requires_valid_range(__first, __last); |
| 4631 | |
| 4632 | return std::__partition(__first, __last, __pred, |
| 4633 | std::__iterator_category(__first)); |
| 4634 | } |
| 4635 | |
| 4636 | |
| 4637 | /** |
| 4638 | * @brief Sort the smallest elements of a sequence. |
| 4639 | * @ingroup sorting_algorithms |
| 4640 | * @param __first An iterator. |
| 4641 | * @param __middle Another iterator. |
| 4642 | * @param __last Another iterator. |
| 4643 | * @return Nothing. |
| 4644 | * |
| 4645 | * Sorts the smallest @p (__middle-__first) elements in the range |
| 4646 | * @p [first,last) and moves them to the range @p [__first,__middle). The |
| 4647 | * order of the remaining elements in the range @p [__middle,__last) is |
| 4648 | * undefined. |
| 4649 | * After the sort if @e i and @e j are iterators in the range |
| 4650 | * @p [__first,__middle) such that i precedes j and @e k is an iterator in |
| 4651 | * the range @p [__middle,__last) then *j<*i and *k<*i are both false. |
| 4652 | */ |
| 4653 | template<typename _RandomAccessIterator> |
| 4654 | _GLIBCXX20_CONSTEXPR |
| 4655 | inline void |
| 4656 | partial_sort(_RandomAccessIterator __first, |
| 4657 | _RandomAccessIterator __middle, |
| 4658 | _RandomAccessIterator __last) |
| 4659 | { |
| 4660 | // concept requirements |
| 4661 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4662 | _RandomAccessIterator>) |
| 4663 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 4664 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 4665 | __glibcxx_requires_valid_range(__first, __middle); |
| 4666 | __glibcxx_requires_valid_range(__middle, __last); |
| 4667 | __glibcxx_requires_irreflexive(__first, __last); |
| 4668 | |
| 4669 | std::__partial_sort(__first, __middle, __last, |
| 4670 | __gnu_cxx::__ops::__iter_less_iter()); |
| 4671 | } |
| 4672 | |
| 4673 | /** |
| 4674 | * @brief Sort the smallest elements of a sequence using a predicate |
| 4675 | * for comparison. |
| 4676 | * @ingroup sorting_algorithms |
| 4677 | * @param __first An iterator. |
| 4678 | * @param __middle Another iterator. |
| 4679 | * @param __last Another iterator. |
| 4680 | * @param __comp A comparison functor. |
| 4681 | * @return Nothing. |
| 4682 | * |
| 4683 | * Sorts the smallest @p (__middle-__first) elements in the range |
| 4684 | * @p [__first,__last) and moves them to the range @p [__first,__middle). The |
| 4685 | * order of the remaining elements in the range @p [__middle,__last) is |
| 4686 | * undefined. |
| 4687 | * After the sort if @e i and @e j are iterators in the range |
| 4688 | * @p [__first,__middle) such that i precedes j and @e k is an iterator in |
| 4689 | * the range @p [__middle,__last) then @p *__comp(j,*i) and @p __comp(*k,*i) |
| 4690 | * are both false. |
| 4691 | */ |
| 4692 | template<typename _RandomAccessIterator, typename _Compare> |
| 4693 | _GLIBCXX20_CONSTEXPR |
| 4694 | inline void |
| 4695 | partial_sort(_RandomAccessIterator __first, |
| 4696 | _RandomAccessIterator __middle, |
| 4697 | _RandomAccessIterator __last, |
| 4698 | _Compare __comp) |
| 4699 | { |
| 4700 | // concept requirements |
| 4701 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4702 | _RandomAccessIterator>) |
| 4703 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 4704 | typename iterator_traits<_RandomAccessIterator>::value_type, |
| 4705 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 4706 | __glibcxx_requires_valid_range(__first, __middle); |
| 4707 | __glibcxx_requires_valid_range(__middle, __last); |
| 4708 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 4709 | |
| 4710 | std::__partial_sort(__first, __middle, __last, |
| 4711 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 4712 | } |
| 4713 | |
| 4714 | /** |
| 4715 | * @brief Sort a sequence just enough to find a particular position. |
| 4716 | * @ingroup sorting_algorithms |
| 4717 | * @param __first An iterator. |
| 4718 | * @param __nth Another iterator. |
| 4719 | * @param __last Another iterator. |
| 4720 | * @return Nothing. |
| 4721 | * |
| 4722 | * Rearranges the elements in the range @p [__first,__last) so that @p *__nth |
| 4723 | * is the same element that would have been in that position had the |
| 4724 | * whole sequence been sorted. The elements either side of @p *__nth are |
| 4725 | * not completely sorted, but for any iterator @e i in the range |
| 4726 | * @p [__first,__nth) and any iterator @e j in the range @p [__nth,__last) it |
| 4727 | * holds that *j < *i is false. |
| 4728 | */ |
| 4729 | template<typename _RandomAccessIterator> |
| 4730 | _GLIBCXX20_CONSTEXPR |
| 4731 | inline void |
| 4732 | nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, |
| 4733 | _RandomAccessIterator __last) |
| 4734 | { |
| 4735 | // concept requirements |
| 4736 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4737 | _RandomAccessIterator>) |
| 4738 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 4739 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 4740 | __glibcxx_requires_valid_range(__first, __nth); |
| 4741 | __glibcxx_requires_valid_range(__nth, __last); |
| 4742 | __glibcxx_requires_irreflexive(__first, __last); |
| 4743 | |
| 4744 | if (__first == __last || __nth == __last) |
| 4745 | return; |
| 4746 | |
| 4747 | std::__introselect(__first, __nth, __last, |
| 4748 | std::__lg(__last - __first) * 2, |
| 4749 | __gnu_cxx::__ops::__iter_less_iter()); |
| 4750 | } |
| 4751 | |
| 4752 | /** |
| 4753 | * @brief Sort a sequence just enough to find a particular position |
| 4754 | * using a predicate for comparison. |
| 4755 | * @ingroup sorting_algorithms |
| 4756 | * @param __first An iterator. |
| 4757 | * @param __nth Another iterator. |
| 4758 | * @param __last Another iterator. |
| 4759 | * @param __comp A comparison functor. |
| 4760 | * @return Nothing. |
| 4761 | * |
| 4762 | * Rearranges the elements in the range @p [__first,__last) so that @p *__nth |
| 4763 | * is the same element that would have been in that position had the |
| 4764 | * whole sequence been sorted. The elements either side of @p *__nth are |
| 4765 | * not completely sorted, but for any iterator @e i in the range |
| 4766 | * @p [__first,__nth) and any iterator @e j in the range @p [__nth,__last) it |
| 4767 | * holds that @p __comp(*j,*i) is false. |
| 4768 | */ |
| 4769 | template<typename _RandomAccessIterator, typename _Compare> |
| 4770 | _GLIBCXX20_CONSTEXPR |
| 4771 | inline void |
| 4772 | nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, |
| 4773 | _RandomAccessIterator __last, _Compare __comp) |
| 4774 | { |
| 4775 | // concept requirements |
| 4776 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4777 | _RandomAccessIterator>) |
| 4778 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 4779 | typename iterator_traits<_RandomAccessIterator>::value_type, |
| 4780 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 4781 | __glibcxx_requires_valid_range(__first, __nth); |
| 4782 | __glibcxx_requires_valid_range(__nth, __last); |
| 4783 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 4784 | |
| 4785 | if (__first == __last || __nth == __last) |
| 4786 | return; |
| 4787 | |
| 4788 | std::__introselect(__first, __nth, __last, |
| 4789 | std::__lg(__last - __first) * 2, |
| 4790 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 4791 | } |
| 4792 | |
| 4793 | /** |
| 4794 | * @brief Sort the elements of a sequence. |
| 4795 | * @ingroup sorting_algorithms |
| 4796 | * @param __first An iterator. |
| 4797 | * @param __last Another iterator. |
| 4798 | * @return Nothing. |
| 4799 | * |
| 4800 | * Sorts the elements in the range @p [__first,__last) in ascending order, |
| 4801 | * such that for each iterator @e i in the range @p [__first,__last-1), |
| 4802 | * *(i+1)<*i is false. |
| 4803 | * |
| 4804 | * The relative ordering of equivalent elements is not preserved, use |
| 4805 | * @p stable_sort() if this is needed. |
| 4806 | */ |
| 4807 | template<typename _RandomAccessIterator> |
| 4808 | _GLIBCXX20_CONSTEXPR |
| 4809 | inline void |
| 4810 | sort(_RandomAccessIterator __first, _RandomAccessIterator __last) |
| 4811 | { |
| 4812 | // concept requirements |
| 4813 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4814 | _RandomAccessIterator>) |
| 4815 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 4816 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 4817 | __glibcxx_requires_valid_range(__first, __last); |
| 4818 | __glibcxx_requires_irreflexive(__first, __last); |
| 4819 | |
| 4820 | std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter()); |
| 4821 | } |
| 4822 | |
| 4823 | /** |
| 4824 | * @brief Sort the elements of a sequence using a predicate for comparison. |
| 4825 | * @ingroup sorting_algorithms |
| 4826 | * @param __first An iterator. |
| 4827 | * @param __last Another iterator. |
| 4828 | * @param __comp A comparison functor. |
| 4829 | * @return Nothing. |
| 4830 | * |
| 4831 | * Sorts the elements in the range @p [__first,__last) in ascending order, |
| 4832 | * such that @p __comp(*(i+1),*i) is false for every iterator @e i in the |
| 4833 | * range @p [__first,__last-1). |
| 4834 | * |
| 4835 | * The relative ordering of equivalent elements is not preserved, use |
| 4836 | * @p stable_sort() if this is needed. |
| 4837 | */ |
| 4838 | template<typename _RandomAccessIterator, typename _Compare> |
| 4839 | _GLIBCXX20_CONSTEXPR |
| 4840 | inline void |
| 4841 | sort(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 4842 | _Compare __comp) |
| 4843 | { |
| 4844 | // concept requirements |
| 4845 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 4846 | _RandomAccessIterator>) |
| 4847 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 4848 | typename iterator_traits<_RandomAccessIterator>::value_type, |
| 4849 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 4850 | __glibcxx_requires_valid_range(__first, __last); |
| 4851 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 4852 | |
| 4853 | std::__sort(__first, __last, __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 4854 | } |
| 4855 | |
| 4856 | template<typename _InputIterator1, typename _InputIterator2, |
| 4857 | typename _OutputIterator, typename _Compare> |
| 4858 | _GLIBCXX20_CONSTEXPR |
| 4859 | _OutputIterator |
| 4860 | __merge(_InputIterator1 __first1, _InputIterator1 __last1, |
| 4861 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 4862 | _OutputIterator __result, _Compare __comp) |
| 4863 | { |
| 4864 | while (__first1 != __last1 && __first2 != __last2) |
| 4865 | { |
| 4866 | if (__comp(__first2, __first1)) |
| 4867 | { |
| 4868 | *__result = *__first2; |
| 4869 | ++__first2; |
| 4870 | } |
| 4871 | else |
| 4872 | { |
| 4873 | *__result = *__first1; |
| 4874 | ++__first1; |
| 4875 | } |
| 4876 | ++__result; |
| 4877 | } |
| 4878 | return std::copy(__first2, __last2, |
| 4879 | std::copy(__first1, __last1, __result)); |
| 4880 | } |
| 4881 | |
| 4882 | /** |
| 4883 | * @brief Merges two sorted ranges. |
| 4884 | * @ingroup sorting_algorithms |
| 4885 | * @param __first1 An iterator. |
| 4886 | * @param __first2 Another iterator. |
| 4887 | * @param __last1 Another iterator. |
| 4888 | * @param __last2 Another iterator. |
| 4889 | * @param __result An iterator pointing to the end of the merged range. |
| 4890 | * @return An output iterator equal to @p __result + (__last1 - __first1) |
| 4891 | * + (__last2 - __first2). |
| 4892 | * |
| 4893 | * Merges the ranges @p [__first1,__last1) and @p [__first2,__last2) into |
| 4894 | * the sorted range @p [__result, __result + (__last1-__first1) + |
| 4895 | * (__last2-__first2)). Both input ranges must be sorted, and the |
| 4896 | * output range must not overlap with either of the input ranges. |
| 4897 | * The sort is @e stable, that is, for equivalent elements in the |
| 4898 | * two ranges, elements from the first range will always come |
| 4899 | * before elements from the second. |
| 4900 | */ |
| 4901 | template<typename _InputIterator1, typename _InputIterator2, |
| 4902 | typename _OutputIterator> |
| 4903 | _GLIBCXX20_CONSTEXPR |
| 4904 | inline _OutputIterator |
| 4905 | merge(_InputIterator1 __first1, _InputIterator1 __last1, |
| 4906 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 4907 | _OutputIterator __result) |
| 4908 | { |
| 4909 | // concept requirements |
| 4910 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 4911 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 4912 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4913 | typename iterator_traits<_InputIterator1>::value_type>) |
| 4914 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4915 | typename iterator_traits<_InputIterator2>::value_type>) |
| 4916 | __glibcxx_function_requires(_LessThanOpConcept< |
| 4917 | typename iterator_traits<_InputIterator2>::value_type, |
| 4918 | typename iterator_traits<_InputIterator1>::value_type>) |
| 4919 | __glibcxx_requires_sorted_set(__first1, __last1, __first2); |
| 4920 | __glibcxx_requires_sorted_set(__first2, __last2, __first1); |
| 4921 | __glibcxx_requires_irreflexive2(__first1, __last1); |
| 4922 | __glibcxx_requires_irreflexive2(__first2, __last2); |
| 4923 | |
| 4924 | return _GLIBCXX_STD_A::__merge(__first1, __last1, |
| 4925 | __first2, __last2, __result, |
| 4926 | __gnu_cxx::__ops::__iter_less_iter()); |
| 4927 | } |
| 4928 | |
| 4929 | /** |
| 4930 | * @brief Merges two sorted ranges. |
| 4931 | * @ingroup sorting_algorithms |
| 4932 | * @param __first1 An iterator. |
| 4933 | * @param __first2 Another iterator. |
| 4934 | * @param __last1 Another iterator. |
| 4935 | * @param __last2 Another iterator. |
| 4936 | * @param __result An iterator pointing to the end of the merged range. |
| 4937 | * @param __comp A functor to use for comparisons. |
| 4938 | * @return An output iterator equal to @p __result + (__last1 - __first1) |
| 4939 | * + (__last2 - __first2). |
| 4940 | * |
| 4941 | * Merges the ranges @p [__first1,__last1) and @p [__first2,__last2) into |
| 4942 | * the sorted range @p [__result, __result + (__last1-__first1) + |
| 4943 | * (__last2-__first2)). Both input ranges must be sorted, and the |
| 4944 | * output range must not overlap with either of the input ranges. |
| 4945 | * The sort is @e stable, that is, for equivalent elements in the |
| 4946 | * two ranges, elements from the first range will always come |
| 4947 | * before elements from the second. |
| 4948 | * |
| 4949 | * The comparison function should have the same effects on ordering as |
| 4950 | * the function used for the initial sort. |
| 4951 | */ |
| 4952 | template<typename _InputIterator1, typename _InputIterator2, |
| 4953 | typename _OutputIterator, typename _Compare> |
| 4954 | _GLIBCXX20_CONSTEXPR |
| 4955 | inline _OutputIterator |
| 4956 | merge(_InputIterator1 __first1, _InputIterator1 __last1, |
| 4957 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 4958 | _OutputIterator __result, _Compare __comp) |
| 4959 | { |
| 4960 | // concept requirements |
| 4961 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 4962 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 4963 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4964 | typename iterator_traits<_InputIterator1>::value_type>) |
| 4965 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 4966 | typename iterator_traits<_InputIterator2>::value_type>) |
| 4967 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 4968 | typename iterator_traits<_InputIterator2>::value_type, |
| 4969 | typename iterator_traits<_InputIterator1>::value_type>) |
| 4970 | __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); |
| 4971 | __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); |
| 4972 | __glibcxx_requires_irreflexive_pred2(__first1, __last1, __comp); |
| 4973 | __glibcxx_requires_irreflexive_pred2(__first2, __last2, __comp); |
| 4974 | |
| 4975 | return _GLIBCXX_STD_A::__merge(__first1, __last1, |
| 4976 | __first2, __last2, __result, |
| 4977 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 4978 | } |
| 4979 | |
| 4980 | template<typename _RandomAccessIterator, typename _Compare> |
| 4981 | inline void |
| 4982 | __stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 4983 | _Compare __comp) |
| 4984 | { |
| 4985 | typedef typename iterator_traits<_RandomAccessIterator>::value_type |
| 4986 | _ValueType; |
| 4987 | typedef typename iterator_traits<_RandomAccessIterator>::difference_type |
| 4988 | _DistanceType; |
| 4989 | typedef _Temporary_buffer<_RandomAccessIterator, _ValueType> _TmpBuf; |
| 4990 | |
| 4991 | if (__first == __last) |
| 4992 | return; |
| 4993 | |
| 4994 | // __stable_sort_adaptive sorts the range in two halves, |
| 4995 | // so the buffer only needs to fit half the range at once. |
| 4996 | _TmpBuf __buf(__first, (__last - __first + 1) / 2); |
| 4997 | |
| 4998 | if (__buf.begin() == 0) |
| 4999 | std::__inplace_stable_sort(__first, __last, __comp); |
| 5000 | else |
| 5001 | std::__stable_sort_adaptive(__first, __last, __buf.begin(), |
| 5002 | _DistanceType(__buf.size()), __comp); |
| 5003 | } |
| 5004 | |
| 5005 | /** |
| 5006 | * @brief Sort the elements of a sequence, preserving the relative order |
| 5007 | * of equivalent elements. |
| 5008 | * @ingroup sorting_algorithms |
| 5009 | * @param __first An iterator. |
| 5010 | * @param __last Another iterator. |
| 5011 | * @return Nothing. |
| 5012 | * |
| 5013 | * Sorts the elements in the range @p [__first,__last) in ascending order, |
| 5014 | * such that for each iterator @p i in the range @p [__first,__last-1), |
| 5015 | * @p *(i+1)<*i is false. |
| 5016 | * |
| 5017 | * The relative ordering of equivalent elements is preserved, so any two |
| 5018 | * elements @p x and @p y in the range @p [__first,__last) such that |
| 5019 | * @p x<y is false and @p y<x is false will have the same relative |
| 5020 | * ordering after calling @p stable_sort(). |
| 5021 | */ |
| 5022 | template<typename _RandomAccessIterator> |
| 5023 | inline void |
| 5024 | stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last) |
| 5025 | { |
| 5026 | // concept requirements |
| 5027 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 5028 | _RandomAccessIterator>) |
| 5029 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 5030 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 5031 | __glibcxx_requires_valid_range(__first, __last); |
| 5032 | __glibcxx_requires_irreflexive(__first, __last); |
| 5033 | |
| 5034 | _GLIBCXX_STD_A::__stable_sort(__first, __last, |
| 5035 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5036 | } |
| 5037 | |
| 5038 | /** |
| 5039 | * @brief Sort the elements of a sequence using a predicate for comparison, |
| 5040 | * preserving the relative order of equivalent elements. |
| 5041 | * @ingroup sorting_algorithms |
| 5042 | * @param __first An iterator. |
| 5043 | * @param __last Another iterator. |
| 5044 | * @param __comp A comparison functor. |
| 5045 | * @return Nothing. |
| 5046 | * |
| 5047 | * Sorts the elements in the range @p [__first,__last) in ascending order, |
| 5048 | * such that for each iterator @p i in the range @p [__first,__last-1), |
| 5049 | * @p __comp(*(i+1),*i) is false. |
| 5050 | * |
| 5051 | * The relative ordering of equivalent elements is preserved, so any two |
| 5052 | * elements @p x and @p y in the range @p [__first,__last) such that |
| 5053 | * @p __comp(x,y) is false and @p __comp(y,x) is false will have the same |
| 5054 | * relative ordering after calling @p stable_sort(). |
| 5055 | */ |
| 5056 | template<typename _RandomAccessIterator, typename _Compare> |
| 5057 | inline void |
| 5058 | stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last, |
| 5059 | _Compare __comp) |
| 5060 | { |
| 5061 | // concept requirements |
| 5062 | __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< |
| 5063 | _RandomAccessIterator>) |
| 5064 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5065 | typename iterator_traits<_RandomAccessIterator>::value_type, |
| 5066 | typename iterator_traits<_RandomAccessIterator>::value_type>) |
| 5067 | __glibcxx_requires_valid_range(__first, __last); |
| 5068 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 5069 | |
| 5070 | _GLIBCXX_STD_A::__stable_sort(__first, __last, |
| 5071 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5072 | } |
| 5073 | |
| 5074 | template<typename _InputIterator1, typename _InputIterator2, |
| 5075 | typename _OutputIterator, |
| 5076 | typename _Compare> |
| 5077 | _GLIBCXX20_CONSTEXPR |
| 5078 | _OutputIterator |
| 5079 | __set_union(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5080 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5081 | _OutputIterator __result, _Compare __comp) |
| 5082 | { |
| 5083 | while (__first1 != __last1 && __first2 != __last2) |
| 5084 | { |
| 5085 | if (__comp(__first1, __first2)) |
| 5086 | { |
| 5087 | *__result = *__first1; |
| 5088 | ++__first1; |
| 5089 | } |
| 5090 | else if (__comp(__first2, __first1)) |
| 5091 | { |
| 5092 | *__result = *__first2; |
| 5093 | ++__first2; |
| 5094 | } |
| 5095 | else |
| 5096 | { |
| 5097 | *__result = *__first1; |
| 5098 | ++__first1; |
| 5099 | ++__first2; |
| 5100 | } |
| 5101 | ++__result; |
| 5102 | } |
| 5103 | return std::copy(__first2, __last2, |
| 5104 | std::copy(__first1, __last1, __result)); |
| 5105 | } |
| 5106 | |
| 5107 | /** |
| 5108 | * @brief Return the union of two sorted ranges. |
| 5109 | * @ingroup set_algorithms |
| 5110 | * @param __first1 Start of first range. |
| 5111 | * @param __last1 End of first range. |
| 5112 | * @param __first2 Start of second range. |
| 5113 | * @param __last2 End of second range. |
| 5114 | * @param __result Start of output range. |
| 5115 | * @return End of the output range. |
| 5116 | * @ingroup set_algorithms |
| 5117 | * |
| 5118 | * This operation iterates over both ranges, copying elements present in |
| 5119 | * each range in order to the output range. Iterators increment for each |
| 5120 | * range. When the current element of one range is less than the other, |
| 5121 | * that element is copied and the iterator advanced. If an element is |
| 5122 | * contained in both ranges, the element from the first range is copied and |
| 5123 | * both ranges advance. The output range may not overlap either input |
| 5124 | * range. |
| 5125 | */ |
| 5126 | template<typename _InputIterator1, typename _InputIterator2, |
| 5127 | typename _OutputIterator> |
| 5128 | _GLIBCXX20_CONSTEXPR |
| 5129 | inline _OutputIterator |
| 5130 | set_union(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5131 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5132 | _OutputIterator __result) |
| 5133 | { |
| 5134 | // concept requirements |
| 5135 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5136 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5137 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5138 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5139 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5140 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5141 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5142 | typename iterator_traits<_InputIterator1>::value_type, |
| 5143 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5144 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5145 | typename iterator_traits<_InputIterator2>::value_type, |
| 5146 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5147 | __glibcxx_requires_sorted_set(__first1, __last1, __first2); |
| 5148 | __glibcxx_requires_sorted_set(__first2, __last2, __first1); |
| 5149 | __glibcxx_requires_irreflexive2(__first1, __last1); |
| 5150 | __glibcxx_requires_irreflexive2(__first2, __last2); |
| 5151 | |
| 5152 | return _GLIBCXX_STD_A::__set_union(__first1, __last1, |
| 5153 | __first2, __last2, __result, |
| 5154 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5155 | } |
| 5156 | |
| 5157 | /** |
| 5158 | * @brief Return the union of two sorted ranges using a comparison functor. |
| 5159 | * @ingroup set_algorithms |
| 5160 | * @param __first1 Start of first range. |
| 5161 | * @param __last1 End of first range. |
| 5162 | * @param __first2 Start of second range. |
| 5163 | * @param __last2 End of second range. |
| 5164 | * @param __result Start of output range. |
| 5165 | * @param __comp The comparison functor. |
| 5166 | * @return End of the output range. |
| 5167 | * @ingroup set_algorithms |
| 5168 | * |
| 5169 | * This operation iterates over both ranges, copying elements present in |
| 5170 | * each range in order to the output range. Iterators increment for each |
| 5171 | * range. When the current element of one range is less than the other |
| 5172 | * according to @p __comp, that element is copied and the iterator advanced. |
| 5173 | * If an equivalent element according to @p __comp is contained in both |
| 5174 | * ranges, the element from the first range is copied and both ranges |
| 5175 | * advance. The output range may not overlap either input range. |
| 5176 | */ |
| 5177 | template<typename _InputIterator1, typename _InputIterator2, |
| 5178 | typename _OutputIterator, typename _Compare> |
| 5179 | _GLIBCXX20_CONSTEXPR |
| 5180 | inline _OutputIterator |
| 5181 | set_union(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5182 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5183 | _OutputIterator __result, _Compare __comp) |
| 5184 | { |
| 5185 | // concept requirements |
| 5186 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5187 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5188 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5189 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5190 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5191 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5192 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5193 | typename iterator_traits<_InputIterator1>::value_type, |
| 5194 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5195 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5196 | typename iterator_traits<_InputIterator2>::value_type, |
| 5197 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5198 | __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); |
| 5199 | __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); |
| 5200 | __glibcxx_requires_irreflexive_pred2(__first1, __last1, __comp); |
| 5201 | __glibcxx_requires_irreflexive_pred2(__first2, __last2, __comp); |
| 5202 | |
| 5203 | return _GLIBCXX_STD_A::__set_union(__first1, __last1, |
| 5204 | __first2, __last2, __result, |
| 5205 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5206 | } |
| 5207 | |
| 5208 | template<typename _InputIterator1, typename _InputIterator2, |
| 5209 | typename _OutputIterator, |
| 5210 | typename _Compare> |
| 5211 | _GLIBCXX20_CONSTEXPR |
| 5212 | _OutputIterator |
| 5213 | __set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5214 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5215 | _OutputIterator __result, _Compare __comp) |
| 5216 | { |
| 5217 | while (__first1 != __last1 && __first2 != __last2) |
| 5218 | if (__comp(__first1, __first2)) |
| 5219 | ++__first1; |
| 5220 | else if (__comp(__first2, __first1)) |
| 5221 | ++__first2; |
| 5222 | else |
| 5223 | { |
| 5224 | *__result = *__first1; |
| 5225 | ++__first1; |
| 5226 | ++__first2; |
| 5227 | ++__result; |
| 5228 | } |
| 5229 | return __result; |
| 5230 | } |
| 5231 | |
| 5232 | /** |
| 5233 | * @brief Return the intersection of two sorted ranges. |
| 5234 | * @ingroup set_algorithms |
| 5235 | * @param __first1 Start of first range. |
| 5236 | * @param __last1 End of first range. |
| 5237 | * @param __first2 Start of second range. |
| 5238 | * @param __last2 End of second range. |
| 5239 | * @param __result Start of output range. |
| 5240 | * @return End of the output range. |
| 5241 | * @ingroup set_algorithms |
| 5242 | * |
| 5243 | * This operation iterates over both ranges, copying elements present in |
| 5244 | * both ranges in order to the output range. Iterators increment for each |
| 5245 | * range. When the current element of one range is less than the other, |
| 5246 | * that iterator advances. If an element is contained in both ranges, the |
| 5247 | * element from the first range is copied and both ranges advance. The |
| 5248 | * output range may not overlap either input range. |
| 5249 | */ |
| 5250 | template<typename _InputIterator1, typename _InputIterator2, |
| 5251 | typename _OutputIterator> |
| 5252 | _GLIBCXX20_CONSTEXPR |
| 5253 | inline _OutputIterator |
| 5254 | set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5255 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5256 | _OutputIterator __result) |
| 5257 | { |
| 5258 | // concept requirements |
| 5259 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5260 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5261 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5262 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5263 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5264 | typename iterator_traits<_InputIterator1>::value_type, |
| 5265 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5266 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5267 | typename iterator_traits<_InputIterator2>::value_type, |
| 5268 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5269 | __glibcxx_requires_sorted_set(__first1, __last1, __first2); |
| 5270 | __glibcxx_requires_sorted_set(__first2, __last2, __first1); |
| 5271 | __glibcxx_requires_irreflexive2(__first1, __last1); |
| 5272 | __glibcxx_requires_irreflexive2(__first2, __last2); |
| 5273 | |
| 5274 | return _GLIBCXX_STD_A::__set_intersection(__first1, __last1, |
| 5275 | __first2, __last2, __result, |
| 5276 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5277 | } |
| 5278 | |
| 5279 | /** |
| 5280 | * @brief Return the intersection of two sorted ranges using comparison |
| 5281 | * functor. |
| 5282 | * @ingroup set_algorithms |
| 5283 | * @param __first1 Start of first range. |
| 5284 | * @param __last1 End of first range. |
| 5285 | * @param __first2 Start of second range. |
| 5286 | * @param __last2 End of second range. |
| 5287 | * @param __result Start of output range. |
| 5288 | * @param __comp The comparison functor. |
| 5289 | * @return End of the output range. |
| 5290 | * @ingroup set_algorithms |
| 5291 | * |
| 5292 | * This operation iterates over both ranges, copying elements present in |
| 5293 | * both ranges in order to the output range. Iterators increment for each |
| 5294 | * range. When the current element of one range is less than the other |
| 5295 | * according to @p __comp, that iterator advances. If an element is |
| 5296 | * contained in both ranges according to @p __comp, the element from the |
| 5297 | * first range is copied and both ranges advance. The output range may not |
| 5298 | * overlap either input range. |
| 5299 | */ |
| 5300 | template<typename _InputIterator1, typename _InputIterator2, |
| 5301 | typename _OutputIterator, typename _Compare> |
| 5302 | _GLIBCXX20_CONSTEXPR |
| 5303 | inline _OutputIterator |
| 5304 | set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5305 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5306 | _OutputIterator __result, _Compare __comp) |
| 5307 | { |
| 5308 | // concept requirements |
| 5309 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5310 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5311 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5312 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5313 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5314 | typename iterator_traits<_InputIterator1>::value_type, |
| 5315 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5316 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5317 | typename iterator_traits<_InputIterator2>::value_type, |
| 5318 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5319 | __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); |
| 5320 | __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); |
| 5321 | __glibcxx_requires_irreflexive_pred2(__first1, __last1, __comp); |
| 5322 | __glibcxx_requires_irreflexive_pred2(__first2, __last2, __comp); |
| 5323 | |
| 5324 | return _GLIBCXX_STD_A::__set_intersection(__first1, __last1, |
| 5325 | __first2, __last2, __result, |
| 5326 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5327 | } |
| 5328 | |
| 5329 | template<typename _InputIterator1, typename _InputIterator2, |
| 5330 | typename _OutputIterator, |
| 5331 | typename _Compare> |
| 5332 | _GLIBCXX20_CONSTEXPR |
| 5333 | _OutputIterator |
| 5334 | __set_difference(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5335 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5336 | _OutputIterator __result, _Compare __comp) |
| 5337 | { |
| 5338 | while (__first1 != __last1 && __first2 != __last2) |
| 5339 | if (__comp(__first1, __first2)) |
| 5340 | { |
| 5341 | *__result = *__first1; |
| 5342 | ++__first1; |
| 5343 | ++__result; |
| 5344 | } |
| 5345 | else if (__comp(__first2, __first1)) |
| 5346 | ++__first2; |
| 5347 | else |
| 5348 | { |
| 5349 | ++__first1; |
| 5350 | ++__first2; |
| 5351 | } |
| 5352 | return std::copy(__first1, __last1, __result); |
| 5353 | } |
| 5354 | |
| 5355 | /** |
| 5356 | * @brief Return the difference of two sorted ranges. |
| 5357 | * @ingroup set_algorithms |
| 5358 | * @param __first1 Start of first range. |
| 5359 | * @param __last1 End of first range. |
| 5360 | * @param __first2 Start of second range. |
| 5361 | * @param __last2 End of second range. |
| 5362 | * @param __result Start of output range. |
| 5363 | * @return End of the output range. |
| 5364 | * @ingroup set_algorithms |
| 5365 | * |
| 5366 | * This operation iterates over both ranges, copying elements present in |
| 5367 | * the first range but not the second in order to the output range. |
| 5368 | * Iterators increment for each range. When the current element of the |
| 5369 | * first range is less than the second, that element is copied and the |
| 5370 | * iterator advances. If the current element of the second range is less, |
| 5371 | * the iterator advances, but no element is copied. If an element is |
| 5372 | * contained in both ranges, no elements are copied and both ranges |
| 5373 | * advance. The output range may not overlap either input range. |
| 5374 | */ |
| 5375 | template<typename _InputIterator1, typename _InputIterator2, |
| 5376 | typename _OutputIterator> |
| 5377 | _GLIBCXX20_CONSTEXPR |
| 5378 | inline _OutputIterator |
| 5379 | set_difference(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5380 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5381 | _OutputIterator __result) |
| 5382 | { |
| 5383 | // concept requirements |
| 5384 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5385 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5386 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5387 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5388 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5389 | typename iterator_traits<_InputIterator1>::value_type, |
| 5390 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5391 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5392 | typename iterator_traits<_InputIterator2>::value_type, |
| 5393 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5394 | __glibcxx_requires_sorted_set(__first1, __last1, __first2); |
| 5395 | __glibcxx_requires_sorted_set(__first2, __last2, __first1); |
| 5396 | __glibcxx_requires_irreflexive2(__first1, __last1); |
| 5397 | __glibcxx_requires_irreflexive2(__first2, __last2); |
| 5398 | |
| 5399 | return _GLIBCXX_STD_A::__set_difference(__first1, __last1, |
| 5400 | __first2, __last2, __result, |
| 5401 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5402 | } |
| 5403 | |
| 5404 | /** |
| 5405 | * @brief Return the difference of two sorted ranges using comparison |
| 5406 | * functor. |
| 5407 | * @ingroup set_algorithms |
| 5408 | * @param __first1 Start of first range. |
| 5409 | * @param __last1 End of first range. |
| 5410 | * @param __first2 Start of second range. |
| 5411 | * @param __last2 End of second range. |
| 5412 | * @param __result Start of output range. |
| 5413 | * @param __comp The comparison functor. |
| 5414 | * @return End of the output range. |
| 5415 | * @ingroup set_algorithms |
| 5416 | * |
| 5417 | * This operation iterates over both ranges, copying elements present in |
| 5418 | * the first range but not the second in order to the output range. |
| 5419 | * Iterators increment for each range. When the current element of the |
| 5420 | * first range is less than the second according to @p __comp, that element |
| 5421 | * is copied and the iterator advances. If the current element of the |
| 5422 | * second range is less, no element is copied and the iterator advances. |
| 5423 | * If an element is contained in both ranges according to @p __comp, no |
| 5424 | * elements are copied and both ranges advance. The output range may not |
| 5425 | * overlap either input range. |
| 5426 | */ |
| 5427 | template<typename _InputIterator1, typename _InputIterator2, |
| 5428 | typename _OutputIterator, typename _Compare> |
| 5429 | _GLIBCXX20_CONSTEXPR |
| 5430 | inline _OutputIterator |
| 5431 | set_difference(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5432 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5433 | _OutputIterator __result, _Compare __comp) |
| 5434 | { |
| 5435 | // concept requirements |
| 5436 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5437 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5438 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5439 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5440 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5441 | typename iterator_traits<_InputIterator1>::value_type, |
| 5442 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5443 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5444 | typename iterator_traits<_InputIterator2>::value_type, |
| 5445 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5446 | __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); |
| 5447 | __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); |
| 5448 | __glibcxx_requires_irreflexive_pred2(__first1, __last1, __comp); |
| 5449 | __glibcxx_requires_irreflexive_pred2(__first2, __last2, __comp); |
| 5450 | |
| 5451 | return _GLIBCXX_STD_A::__set_difference(__first1, __last1, |
| 5452 | __first2, __last2, __result, |
| 5453 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5454 | } |
| 5455 | |
| 5456 | template<typename _InputIterator1, typename _InputIterator2, |
| 5457 | typename _OutputIterator, |
| 5458 | typename _Compare> |
| 5459 | _GLIBCXX20_CONSTEXPR |
| 5460 | _OutputIterator |
| 5461 | __set_symmetric_difference(_InputIterator1 __first1, |
| 5462 | _InputIterator1 __last1, |
| 5463 | _InputIterator2 __first2, |
| 5464 | _InputIterator2 __last2, |
| 5465 | _OutputIterator __result, |
| 5466 | _Compare __comp) |
| 5467 | { |
| 5468 | while (__first1 != __last1 && __first2 != __last2) |
| 5469 | if (__comp(__first1, __first2)) |
| 5470 | { |
| 5471 | *__result = *__first1; |
| 5472 | ++__first1; |
| 5473 | ++__result; |
| 5474 | } |
| 5475 | else if (__comp(__first2, __first1)) |
| 5476 | { |
| 5477 | *__result = *__first2; |
| 5478 | ++__first2; |
| 5479 | ++__result; |
| 5480 | } |
| 5481 | else |
| 5482 | { |
| 5483 | ++__first1; |
| 5484 | ++__first2; |
| 5485 | } |
| 5486 | return std::copy(__first2, __last2, |
| 5487 | std::copy(__first1, __last1, __result)); |
| 5488 | } |
| 5489 | |
| 5490 | /** |
| 5491 | * @brief Return the symmetric difference of two sorted ranges. |
| 5492 | * @ingroup set_algorithms |
| 5493 | * @param __first1 Start of first range. |
| 5494 | * @param __last1 End of first range. |
| 5495 | * @param __first2 Start of second range. |
| 5496 | * @param __last2 End of second range. |
| 5497 | * @param __result Start of output range. |
| 5498 | * @return End of the output range. |
| 5499 | * @ingroup set_algorithms |
| 5500 | * |
| 5501 | * This operation iterates over both ranges, copying elements present in |
| 5502 | * one range but not the other in order to the output range. Iterators |
| 5503 | * increment for each range. When the current element of one range is less |
| 5504 | * than the other, that element is copied and the iterator advances. If an |
| 5505 | * element is contained in both ranges, no elements are copied and both |
| 5506 | * ranges advance. The output range may not overlap either input range. |
| 5507 | */ |
| 5508 | template<typename _InputIterator1, typename _InputIterator2, |
| 5509 | typename _OutputIterator> |
| 5510 | _GLIBCXX20_CONSTEXPR |
| 5511 | inline _OutputIterator |
| 5512 | set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5513 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5514 | _OutputIterator __result) |
| 5515 | { |
| 5516 | // concept requirements |
| 5517 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5518 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5519 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5520 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5521 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5522 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5523 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5524 | typename iterator_traits<_InputIterator1>::value_type, |
| 5525 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5526 | __glibcxx_function_requires(_LessThanOpConcept< |
| 5527 | typename iterator_traits<_InputIterator2>::value_type, |
| 5528 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5529 | __glibcxx_requires_sorted_set(__first1, __last1, __first2); |
| 5530 | __glibcxx_requires_sorted_set(__first2, __last2, __first1); |
| 5531 | __glibcxx_requires_irreflexive2(__first1, __last1); |
| 5532 | __glibcxx_requires_irreflexive2(__first2, __last2); |
| 5533 | |
| 5534 | return _GLIBCXX_STD_A::__set_symmetric_difference(__first1, __last1, |
| 5535 | __first2, __last2, __result, |
| 5536 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5537 | } |
| 5538 | |
| 5539 | /** |
| 5540 | * @brief Return the symmetric difference of two sorted ranges using |
| 5541 | * comparison functor. |
| 5542 | * @ingroup set_algorithms |
| 5543 | * @param __first1 Start of first range. |
| 5544 | * @param __last1 End of first range. |
| 5545 | * @param __first2 Start of second range. |
| 5546 | * @param __last2 End of second range. |
| 5547 | * @param __result Start of output range. |
| 5548 | * @param __comp The comparison functor. |
| 5549 | * @return End of the output range. |
| 5550 | * @ingroup set_algorithms |
| 5551 | * |
| 5552 | * This operation iterates over both ranges, copying elements present in |
| 5553 | * one range but not the other in order to the output range. Iterators |
| 5554 | * increment for each range. When the current element of one range is less |
| 5555 | * than the other according to @p comp, that element is copied and the |
| 5556 | * iterator advances. If an element is contained in both ranges according |
| 5557 | * to @p __comp, no elements are copied and both ranges advance. The output |
| 5558 | * range may not overlap either input range. |
| 5559 | */ |
| 5560 | template<typename _InputIterator1, typename _InputIterator2, |
| 5561 | typename _OutputIterator, typename _Compare> |
| 5562 | _GLIBCXX20_CONSTEXPR |
| 5563 | inline _OutputIterator |
| 5564 | set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1, |
| 5565 | _InputIterator2 __first2, _InputIterator2 __last2, |
| 5566 | _OutputIterator __result, |
| 5567 | _Compare __comp) |
| 5568 | { |
| 5569 | // concept requirements |
| 5570 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) |
| 5571 | __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) |
| 5572 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5573 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5574 | __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, |
| 5575 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5576 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5577 | typename iterator_traits<_InputIterator1>::value_type, |
| 5578 | typename iterator_traits<_InputIterator2>::value_type>) |
| 5579 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5580 | typename iterator_traits<_InputIterator2>::value_type, |
| 5581 | typename iterator_traits<_InputIterator1>::value_type>) |
| 5582 | __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp); |
| 5583 | __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp); |
| 5584 | __glibcxx_requires_irreflexive_pred2(__first1, __last1, __comp); |
| 5585 | __glibcxx_requires_irreflexive_pred2(__first2, __last2, __comp); |
| 5586 | |
| 5587 | return _GLIBCXX_STD_A::__set_symmetric_difference(__first1, __last1, |
| 5588 | __first2, __last2, __result, |
| 5589 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5590 | } |
| 5591 | |
| 5592 | template<typename _ForwardIterator, typename _Compare> |
| 5593 | _GLIBCXX14_CONSTEXPR |
| 5594 | _ForwardIterator |
| 5595 | __min_element(_ForwardIterator __first, _ForwardIterator __last, |
| 5596 | _Compare __comp) |
| 5597 | { |
| 5598 | if (__first == __last) |
| 5599 | return __first; |
| 5600 | _ForwardIterator __result = __first; |
| 5601 | while (++__first != __last) |
| 5602 | if (__comp(__first, __result)) |
| 5603 | __result = __first; |
| 5604 | return __result; |
| 5605 | } |
| 5606 | |
| 5607 | /** |
| 5608 | * @brief Return the minimum element in a range. |
| 5609 | * @ingroup sorting_algorithms |
| 5610 | * @param __first Start of range. |
| 5611 | * @param __last End of range. |
| 5612 | * @return Iterator referencing the first instance of the smallest value. |
| 5613 | */ |
| 5614 | template<typename _ForwardIterator> |
| 5615 | _GLIBCXX14_CONSTEXPR |
| 5616 | _ForwardIterator |
| 5617 | inline min_element(_ForwardIterator __first, _ForwardIterator __last) |
| 5618 | { |
| 5619 | // concept requirements |
| 5620 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 5621 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 5622 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 5623 | __glibcxx_requires_valid_range(__first, __last); |
| 5624 | __glibcxx_requires_irreflexive(__first, __last); |
| 5625 | |
| 5626 | return _GLIBCXX_STD_A::__min_element(__first, __last, |
| 5627 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5628 | } |
| 5629 | |
| 5630 | /** |
| 5631 | * @brief Return the minimum element in a range using comparison functor. |
| 5632 | * @ingroup sorting_algorithms |
| 5633 | * @param __first Start of range. |
| 5634 | * @param __last End of range. |
| 5635 | * @param __comp Comparison functor. |
| 5636 | * @return Iterator referencing the first instance of the smallest value |
| 5637 | * according to __comp. |
| 5638 | */ |
| 5639 | template<typename _ForwardIterator, typename _Compare> |
| 5640 | _GLIBCXX14_CONSTEXPR |
| 5641 | inline _ForwardIterator |
| 5642 | min_element(_ForwardIterator __first, _ForwardIterator __last, |
| 5643 | _Compare __comp) |
| 5644 | { |
| 5645 | // concept requirements |
| 5646 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 5647 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5648 | typename iterator_traits<_ForwardIterator>::value_type, |
| 5649 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 5650 | __glibcxx_requires_valid_range(__first, __last); |
| 5651 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 5652 | |
| 5653 | return _GLIBCXX_STD_A::__min_element(__first, __last, |
| 5654 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5655 | } |
| 5656 | |
| 5657 | template<typename _ForwardIterator, typename _Compare> |
| 5658 | _GLIBCXX14_CONSTEXPR |
| 5659 | _ForwardIterator |
| 5660 | __max_element(_ForwardIterator __first, _ForwardIterator __last, |
| 5661 | _Compare __comp) |
| 5662 | { |
| 5663 | if (__first == __last) return __first; |
| 5664 | _ForwardIterator __result = __first; |
| 5665 | while (++__first != __last) |
| 5666 | if (__comp(__result, __first)) |
| 5667 | __result = __first; |
| 5668 | return __result; |
| 5669 | } |
| 5670 | |
| 5671 | /** |
| 5672 | * @brief Return the maximum element in a range. |
| 5673 | * @ingroup sorting_algorithms |
| 5674 | * @param __first Start of range. |
| 5675 | * @param __last End of range. |
| 5676 | * @return Iterator referencing the first instance of the largest value. |
| 5677 | */ |
| 5678 | template<typename _ForwardIterator> |
| 5679 | _GLIBCXX14_CONSTEXPR |
| 5680 | inline _ForwardIterator |
| 5681 | max_element(_ForwardIterator __first, _ForwardIterator __last) |
| 5682 | { |
| 5683 | // concept requirements |
| 5684 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 5685 | __glibcxx_function_requires(_LessThanComparableConcept< |
| 5686 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 5687 | __glibcxx_requires_valid_range(__first, __last); |
| 5688 | __glibcxx_requires_irreflexive(__first, __last); |
| 5689 | |
| 5690 | return _GLIBCXX_STD_A::__max_element(__first, __last, |
| 5691 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5692 | } |
| 5693 | |
| 5694 | /** |
| 5695 | * @brief Return the maximum element in a range using comparison functor. |
| 5696 | * @ingroup sorting_algorithms |
| 5697 | * @param __first Start of range. |
| 5698 | * @param __last End of range. |
| 5699 | * @param __comp Comparison functor. |
| 5700 | * @return Iterator referencing the first instance of the largest value |
| 5701 | * according to __comp. |
| 5702 | */ |
| 5703 | template<typename _ForwardIterator, typename _Compare> |
| 5704 | _GLIBCXX14_CONSTEXPR |
| 5705 | inline _ForwardIterator |
| 5706 | max_element(_ForwardIterator __first, _ForwardIterator __last, |
| 5707 | _Compare __comp) |
| 5708 | { |
| 5709 | // concept requirements |
| 5710 | __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) |
| 5711 | __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, |
| 5712 | typename iterator_traits<_ForwardIterator>::value_type, |
| 5713 | typename iterator_traits<_ForwardIterator>::value_type>) |
| 5714 | __glibcxx_requires_valid_range(__first, __last); |
| 5715 | __glibcxx_requires_irreflexive_pred(__first, __last, __comp); |
| 5716 | |
| 5717 | return _GLIBCXX_STD_A::__max_element(__first, __last, |
| 5718 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5719 | } |
| 5720 | |
| 5721 | #if __cplusplus >= 201103L |
| 5722 | // N2722 + DR 915. |
| 5723 | template<typename _Tp> |
| 5724 | _GLIBCXX14_CONSTEXPR |
| 5725 | inline _Tp |
| 5726 | min(initializer_list<_Tp> __l) |
| 5727 | { |
| 5728 | __glibcxx_requires_irreflexive(__l.begin(), __l.end()); |
| 5729 | return *_GLIBCXX_STD_A::__min_element(__l.begin(), __l.end(), |
| 5730 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5731 | } |
| 5732 | |
| 5733 | template<typename _Tp, typename _Compare> |
| 5734 | _GLIBCXX14_CONSTEXPR |
| 5735 | inline _Tp |
| 5736 | min(initializer_list<_Tp> __l, _Compare __comp) |
| 5737 | { |
| 5738 | __glibcxx_requires_irreflexive_pred(__l.begin(), __l.end(), __comp); |
| 5739 | return *_GLIBCXX_STD_A::__min_element(__l.begin(), __l.end(), |
| 5740 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5741 | } |
| 5742 | |
| 5743 | template<typename _Tp> |
| 5744 | _GLIBCXX14_CONSTEXPR |
| 5745 | inline _Tp |
| 5746 | max(initializer_list<_Tp> __l) |
| 5747 | { |
| 5748 | __glibcxx_requires_irreflexive(__l.begin(), __l.end()); |
| 5749 | return *_GLIBCXX_STD_A::__max_element(__l.begin(), __l.end(), |
| 5750 | __gnu_cxx::__ops::__iter_less_iter()); |
| 5751 | } |
| 5752 | |
| 5753 | template<typename _Tp, typename _Compare> |
| 5754 | _GLIBCXX14_CONSTEXPR |
| 5755 | inline _Tp |
| 5756 | max(initializer_list<_Tp> __l, _Compare __comp) |
| 5757 | { |
| 5758 | __glibcxx_requires_irreflexive_pred(__l.begin(), __l.end(), __comp); |
| 5759 | return *_GLIBCXX_STD_A::__max_element(__l.begin(), __l.end(), |
| 5760 | __gnu_cxx::__ops::__iter_comp_iter(__comp)); |
| 5761 | } |
| 5762 | #endif // C++11 |
| 5763 | |
| 5764 | #if __cplusplus >= 201402L |
| 5765 | /// Reservoir sampling algorithm. |
| 5766 | template<typename _InputIterator, typename _RandomAccessIterator, |
| 5767 | typename _Size, typename _UniformRandomBitGenerator> |
| 5768 | _RandomAccessIterator |
| 5769 | __sample(_InputIterator __first, _InputIterator __last, input_iterator_tag, |
| 5770 | _RandomAccessIterator __out, random_access_iterator_tag, |
| 5771 | _Size __n, _UniformRandomBitGenerator&& __g) |
| 5772 | { |
| 5773 | using __distrib_type = uniform_int_distribution<_Size>; |
| 5774 | using __param_type = typename __distrib_type::param_type; |
| 5775 | __distrib_type __d{}; |
| 5776 | _Size __sample_sz = 0; |
| 5777 | while (__first != __last && __sample_sz != __n) |
| 5778 | { |
| 5779 | __out[__sample_sz++] = *__first; |
| 5780 | ++__first; |
| 5781 | } |
| 5782 | for (auto __pop_sz = __sample_sz; __first != __last; |
| 5783 | ++__first, (void) ++__pop_sz) |
| 5784 | { |
| 5785 | const auto __k = __d(__g, __param_type{0, __pop_sz}); |
| 5786 | if (__k < __n) |
| 5787 | __out[__k] = *__first; |
| 5788 | } |
| 5789 | return __out + __sample_sz; |
| 5790 | } |
| 5791 | |
| 5792 | /// Selection sampling algorithm. |
| 5793 | template<typename _ForwardIterator, typename _OutputIterator, typename _Cat, |
| 5794 | typename _Size, typename _UniformRandomBitGenerator> |
| 5795 | _OutputIterator |
| 5796 | __sample(_ForwardIterator __first, _ForwardIterator __last, |
| 5797 | forward_iterator_tag, |
| 5798 | _OutputIterator __out, _Cat, |
| 5799 | _Size __n, _UniformRandomBitGenerator&& __g) |
| 5800 | { |
| 5801 | using __distrib_type = uniform_int_distribution<_Size>; |
| 5802 | using __param_type = typename __distrib_type::param_type; |
| 5803 | using _USize = make_unsigned_t<_Size>; |
| 5804 | using _Gen = remove_reference_t<_UniformRandomBitGenerator>; |
| 5805 | using __uc_type = common_type_t<typename _Gen::result_type, _USize>; |
| 5806 | |
| 5807 | if (__first == __last) |
| 5808 | return __out; |
| 5809 | |
| 5810 | __distrib_type __d{}; |
| 5811 | _Size __unsampled_sz = std::distance(__first, __last); |
| 5812 | __n = std::min(__n, __unsampled_sz); |
| 5813 | |
| 5814 | // If possible, we use __gen_two_uniform_ints to efficiently produce |
| 5815 | // two random numbers using a single distribution invocation: |
| 5816 | |
| 5817 | const __uc_type __urngrange = __g.max() - __g.min(); |
| 5818 | if (__urngrange / __uc_type(__unsampled_sz) >= __uc_type(__unsampled_sz)) |
| 5819 | // I.e. (__urngrange >= __unsampled_sz * __unsampled_sz) but without |
| 5820 | // wrapping issues. |
| 5821 | { |
| 5822 | while (__n != 0 && __unsampled_sz >= 2) |
| 5823 | { |
| 5824 | const pair<_Size, _Size> __p = |
| 5825 | __gen_two_uniform_ints(__unsampled_sz, __unsampled_sz - 1, __g); |
| 5826 | |
| 5827 | --__unsampled_sz; |
| 5828 | if (__p.first < __n) |
| 5829 | { |
| 5830 | *__out++ = *__first; |
| 5831 | --__n; |
| 5832 | } |
| 5833 | |
| 5834 | ++__first; |
| 5835 | |
| 5836 | if (__n == 0) break; |
| 5837 | |
| 5838 | --__unsampled_sz; |
| 5839 | if (__p.second < __n) |
| 5840 | { |
| 5841 | *__out++ = *__first; |
| 5842 | --__n; |
| 5843 | } |
| 5844 | |
| 5845 | ++__first; |
| 5846 | } |
| 5847 | } |
| 5848 | |
| 5849 | // The loop above is otherwise equivalent to this one-at-a-time version: |
| 5850 | |
| 5851 | for (; __n != 0; ++__first) |
| 5852 | if (__d(__g, __param_type{0, --__unsampled_sz}) < __n) |
| 5853 | { |
| 5854 | *__out++ = *__first; |
| 5855 | --__n; |
| 5856 | } |
| 5857 | return __out; |
| 5858 | } |
| 5859 | |
| 5860 | #if __cplusplus > 201402L |
| 5861 | #define __cpp_lib_sample 201603L |
| 5862 | /// Take a random sample from a population. |
| 5863 | template<typename _PopulationIterator, typename _SampleIterator, |
| 5864 | typename _Distance, typename _UniformRandomBitGenerator> |
| 5865 | _SampleIterator |
| 5866 | sample(_PopulationIterator __first, _PopulationIterator __last, |
| 5867 | _SampleIterator __out, _Distance __n, |
| 5868 | _UniformRandomBitGenerator&& __g) |
| 5869 | { |
| 5870 | using __pop_cat = typename |
| 5871 | std::iterator_traits<_PopulationIterator>::iterator_category; |
| 5872 | using __samp_cat = typename |
| 5873 | std::iterator_traits<_SampleIterator>::iterator_category; |
| 5874 | |
| 5875 | static_assert( |
| 5876 | __or_<is_convertible<__pop_cat, forward_iterator_tag>, |
| 5877 | is_convertible<__samp_cat, random_access_iterator_tag>>::value, |
| 5878 | "output range must use a RandomAccessIterator when input range" |
| 5879 | " does not meet the ForwardIterator requirements"); |
| 5880 | |
| 5881 | static_assert(is_integral<_Distance>::value, |
| 5882 | "sample size must be an integer type"); |
| 5883 | |
| 5884 | typename iterator_traits<_PopulationIterator>::difference_type __d = __n; |
| 5885 | return _GLIBCXX_STD_A:: |
| 5886 | __sample(__first, __last, __pop_cat{}, __out, __samp_cat{}, __d, |
| 5887 | std::forward<_UniformRandomBitGenerator>(__g)); |
| 5888 | } |
| 5889 | #endif // C++17 |
| 5890 | #endif // C++14 |
| 5891 | |
| 5892 | _GLIBCXX_END_NAMESPACE_ALGO |
| 5893 | _GLIBCXX_END_NAMESPACE_VERSION |
| 5894 | } // namespace std |
| 5895 | |
| 5896 | #endif /* _STL_ALGO_H */ |
| 5897 |
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