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