1// -*- C++ -*-
2//===--------------------------- tuple ------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_TUPLE
11#define _LIBCPP_TUPLE
12
13/*
14 tuple synopsis
15
16namespace std
17{
18
19template <class... T>
20class tuple {
21public:
22 explicit(see-below) constexpr tuple();
23 explicit(see-below) tuple(const T&...); // constexpr in C++14
24 template <class... U>
25 explicit(see-below) tuple(U&&...); // constexpr in C++14
26 tuple(const tuple&) = default;
27 tuple(tuple&&) = default;
28 template <class... U>
29 explicit(see-below) tuple(const tuple<U...>&); // constexpr in C++14
30 template <class... U>
31 explicit(see-below) tuple(tuple<U...>&&); // constexpr in C++14
32 template <class U1, class U2>
33 explicit(see-below) tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
34 template <class U1, class U2>
35 explicit(see-below) tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14
36
37 // allocator-extended constructors
38 template <class Alloc>
39 tuple(allocator_arg_t, const Alloc& a);
40 template <class Alloc>
41 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const T&...);
42 template <class Alloc, class... U>
43 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, U&&...);
44 template <class Alloc>
45 tuple(allocator_arg_t, const Alloc& a, const tuple&);
46 template <class Alloc>
47 tuple(allocator_arg_t, const Alloc& a, tuple&&);
48 template <class Alloc, class... U>
49 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&);
50 template <class Alloc, class... U>
51 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&);
52 template <class Alloc, class U1, class U2>
53 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&);
54 template <class Alloc, class U1, class U2>
55 explicit(see-below) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&);
56
57 tuple& operator=(const tuple&);
58 tuple&
59 operator=(tuple&&) noexcept(AND(is_nothrow_move_assignable<T>::value ...));
60 template <class... U>
61 tuple& operator=(const tuple<U...>&);
62 template <class... U>
63 tuple& operator=(tuple<U...>&&);
64 template <class U1, class U2>
65 tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2
66 template <class U1, class U2>
67 tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2
68
69 void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...));
70};
71
72template <class ...T>
73tuple(T...) -> tuple<T...>; // since C++17
74template <class T1, class T2>
75tuple(pair<T1, T2>) -> tuple<T1, T2>; // since C++17
76template <class Alloc, class ...T>
77tuple(allocator_arg_t, Alloc, T...) -> tuple<T...>; // since C++17
78template <class Alloc, class T1, class T2>
79tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; // since C++17
80template <class Alloc, class ...T>
81tuple(allocator_arg_t, Alloc, tuple<T...>) -> tuple<T...>; // since C++17
82
83inline constexpr unspecified ignore;
84
85template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
86template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
87template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
88template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
89
90// [tuple.apply], calling a function with a tuple of arguments:
91template <class F, class Tuple>
92 constexpr decltype(auto) apply(F&& f, Tuple&& t); // C++17
93template <class T, class Tuple>
94 constexpr T make_from_tuple(Tuple&& t); // C++17
95
96// 20.4.1.4, tuple helper classes:
97template <class T> struct tuple_size; // undefined
98template <class... T> struct tuple_size<tuple<T...>>;
99template <class T>
100 inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17
101template <size_t I, class T> struct tuple_element; // undefined
102template <size_t I, class... T> struct tuple_element<I, tuple<T...>>;
103template <size_t I, class T>
104 using tuple_element_t = typename tuple_element <I, T>::type; // C++14
105
106// 20.4.1.5, element access:
107template <size_t I, class... T>
108 typename tuple_element<I, tuple<T...>>::type&
109 get(tuple<T...>&) noexcept; // constexpr in C++14
110template <size_t I, class... T>
111 const typename tuple_element<I, tuple<T...>>::type&
112 get(const tuple<T...>&) noexcept; // constexpr in C++14
113template <size_t I, class... T>
114 typename tuple_element<I, tuple<T...>>::type&&
115 get(tuple<T...>&&) noexcept; // constexpr in C++14
116template <size_t I, class... T>
117 const typename tuple_element<I, tuple<T...>>::type&&
118 get(const tuple<T...>&&) noexcept; // constexpr in C++14
119
120template <class T1, class... T>
121 constexpr T1& get(tuple<T...>&) noexcept; // C++14
122template <class T1, class... T>
123 constexpr const T1& get(const tuple<T...>&) noexcept; // C++14
124template <class T1, class... T>
125 constexpr T1&& get(tuple<T...>&&) noexcept; // C++14
126template <class T1, class... T>
127 constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14
128
129// 20.4.1.6, relational operators:
130template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
131template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
132template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
133template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
134template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
135template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
136
137template <class... Types, class Alloc>
138 struct uses_allocator<tuple<Types...>, Alloc>;
139
140template <class... Types>
141 void
142 swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y)));
143
144} // std
145
146*/
147
148#include <__config>
149#include <__tuple>
150#include <cstddef>
151#include <type_traits>
152#include <__functional_base>
153#include <utility>
154#include <version>
155
156#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
157#pragma GCC system_header
158#endif
159
160_LIBCPP_BEGIN_NAMESPACE_STD
161
162#ifndef _LIBCPP_CXX03_LANG
163
164
165// __tuple_leaf
166
167template <size_t _Ip, class _Hp,
168 bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value
169 >
170class __tuple_leaf;
171
172template <size_t _Ip, class _Hp, bool _Ep>
173inline _LIBCPP_INLINE_VISIBILITY
174void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y)
175 _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value)
176{
177 swap(__x.get(), __y.get());
178}
179
180template <size_t _Ip, class _Hp, bool>
181class __tuple_leaf
182{
183 _Hp __value_;
184
185 template <class _Tp>
186 static constexpr bool __can_bind_reference() {
187#if __has_keyword(__reference_binds_to_temporary)
188 return !__reference_binds_to_temporary(_Hp, _Tp);
189#else
190 return true;
191#endif
192 }
193
194 __tuple_leaf& operator=(const __tuple_leaf&);
195public:
196 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf()
197 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : __value_()
198 {static_assert(!is_reference<_Hp>::value,
199 "Attempted to default construct a reference element in a tuple");}
200
201 template <class _Alloc>
202 _LIBCPP_INLINE_VISIBILITY
203 __tuple_leaf(integral_constant<int, 0>, const _Alloc&)
204 : __value_()
205 {static_assert(!is_reference<_Hp>::value,
206 "Attempted to default construct a reference element in a tuple");}
207
208 template <class _Alloc>
209 _LIBCPP_INLINE_VISIBILITY
210 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
211 : __value_(allocator_arg_t(), __a)
212 {static_assert(!is_reference<_Hp>::value,
213 "Attempted to default construct a reference element in a tuple");}
214
215 template <class _Alloc>
216 _LIBCPP_INLINE_VISIBILITY
217 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a)
218 : __value_(__a)
219 {static_assert(!is_reference<_Hp>::value,
220 "Attempted to default construct a reference element in a tuple");}
221
222 template <class _Tp,
223 class = _EnableIf<
224 _And<
225 _IsNotSame<__uncvref_t<_Tp>, __tuple_leaf>,
226 is_constructible<_Hp, _Tp>
227 >::value
228 >
229 >
230 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
231 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
232 : __value_(_VSTD::forward<_Tp>(__t))
233 {static_assert(__can_bind_reference<_Tp&&>(),
234 "Attempted construction of reference element binds to a temporary whose lifetime has ended");}
235
236 template <class _Tp, class _Alloc>
237 _LIBCPP_INLINE_VISIBILITY
238 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
239 : __value_(_VSTD::forward<_Tp>(__t))
240 {static_assert(__can_bind_reference<_Tp&&>(),
241 "Attempted construction of reference element binds to a temporary whose lifetime has ended");}
242
243 template <class _Tp, class _Alloc>
244 _LIBCPP_INLINE_VISIBILITY
245 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
246 : __value_(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t))
247 {static_assert(!is_reference<_Hp>::value,
248 "Attempted to uses-allocator construct a reference element in a tuple");}
249
250 template <class _Tp, class _Alloc>
251 _LIBCPP_INLINE_VISIBILITY
252 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
253 : __value_(_VSTD::forward<_Tp>(__t), __a)
254 {static_assert(!is_reference<_Hp>::value,
255 "Attempted to uses-allocator construct a reference element in a tuple");}
256
257 __tuple_leaf(const __tuple_leaf& __t) = default;
258 __tuple_leaf(__tuple_leaf&& __t) = default;
259
260 template <class _Tp>
261 _LIBCPP_INLINE_VISIBILITY
262 __tuple_leaf&
263 operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value))
264 {
265 __value_ = _VSTD::forward<_Tp>(__t);
266 return *this;
267 }
268
269 _LIBCPP_INLINE_VISIBILITY
270 int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value)
271 {
272 _VSTD::swap(*this, __t);
273 return 0;
274 }
275
276 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return __value_;}
277 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return __value_;}
278};
279
280template <size_t _Ip, class _Hp>
281class __tuple_leaf<_Ip, _Hp, true>
282 : private _Hp
283{
284
285 __tuple_leaf& operator=(const __tuple_leaf&);
286public:
287 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf()
288 _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {}
289
290 template <class _Alloc>
291 _LIBCPP_INLINE_VISIBILITY
292 __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {}
293
294 template <class _Alloc>
295 _LIBCPP_INLINE_VISIBILITY
296 __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
297 : _Hp(allocator_arg_t(), __a) {}
298
299 template <class _Alloc>
300 _LIBCPP_INLINE_VISIBILITY
301 __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a)
302 : _Hp(__a) {}
303
304 template <class _Tp,
305 class = _EnableIf<
306 _And<
307 _IsNotSame<__uncvref_t<_Tp>, __tuple_leaf>,
308 is_constructible<_Hp, _Tp>
309 >::value
310 >
311 >
312 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
313 explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
314 : _Hp(_VSTD::forward<_Tp>(__t)) {}
315
316 template <class _Tp, class _Alloc>
317 _LIBCPP_INLINE_VISIBILITY
318 explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
319 : _Hp(_VSTD::forward<_Tp>(__t)) {}
320
321 template <class _Tp, class _Alloc>
322 _LIBCPP_INLINE_VISIBILITY
323 explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
324 : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {}
325
326 template <class _Tp, class _Alloc>
327 _LIBCPP_INLINE_VISIBILITY
328 explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
329 : _Hp(_VSTD::forward<_Tp>(__t), __a) {}
330
331 __tuple_leaf(__tuple_leaf const &) = default;
332 __tuple_leaf(__tuple_leaf &&) = default;
333
334 template <class _Tp>
335 _LIBCPP_INLINE_VISIBILITY
336 __tuple_leaf&
337 operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value))
338 {
339 _Hp::operator=(_VSTD::forward<_Tp>(__t));
340 return *this;
341 }
342
343 _LIBCPP_INLINE_VISIBILITY
344 int
345 swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value)
346 {
347 _VSTD::swap(*this, __t);
348 return 0;
349 }
350
351 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);}
352 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);}
353};
354
355template <class ..._Tp>
356_LIBCPP_INLINE_VISIBILITY
357void __swallow(_Tp&&...) _NOEXCEPT {}
358
359template <class _Tp>
360struct __all_default_constructible;
361
362template <class ..._Tp>
363struct __all_default_constructible<__tuple_types<_Tp...>>
364 : __all<is_default_constructible<_Tp>::value...>
365{ };
366
367// __tuple_impl
368
369template<class _Indx, class ..._Tp> struct __tuple_impl;
370
371template<size_t ..._Indx, class ..._Tp>
372struct _LIBCPP_DECLSPEC_EMPTY_BASES __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
373 : public __tuple_leaf<_Indx, _Tp>...
374{
375 _LIBCPP_INLINE_VISIBILITY
376 _LIBCPP_CONSTEXPR __tuple_impl()
377 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
378
379 template <size_t ..._Uf, class ..._Tf,
380 size_t ..._Ul, class ..._Tl, class ..._Up>
381 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
382 explicit
383 __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>,
384 __tuple_indices<_Ul...>, __tuple_types<_Tl...>,
385 _Up&&... __u)
386 _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
387 __all<is_nothrow_default_constructible<_Tl>::value...>::value)) :
388 __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))...,
389 __tuple_leaf<_Ul, _Tl>()...
390 {}
391
392 template <class _Alloc, size_t ..._Uf, class ..._Tf,
393 size_t ..._Ul, class ..._Tl, class ..._Up>
394 _LIBCPP_INLINE_VISIBILITY
395 explicit
396 __tuple_impl(allocator_arg_t, const _Alloc& __a,
397 __tuple_indices<_Uf...>, __tuple_types<_Tf...>,
398 __tuple_indices<_Ul...>, __tuple_types<_Tl...>,
399 _Up&&... __u) :
400 __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a,
401 _VSTD::forward<_Up>(__u))...,
402 __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)...
403 {}
404
405 template <class _Tuple,
406 class = typename enable_if
407 <
408 __tuple_constructible<_Tuple, tuple<_Tp...> >::value
409 >::type
410 >
411 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
412 __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx,
413 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
414 : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx,
415 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...
416 {}
417
418 template <class _Alloc, class _Tuple,
419 class = typename enable_if
420 <
421 __tuple_constructible<_Tuple, tuple<_Tp...> >::value
422 >::type
423 >
424 _LIBCPP_INLINE_VISIBILITY
425 __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
426 : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx,
427 typename __make_tuple_types<_Tuple>::type>::type>(), __a,
428 _VSTD::forward<typename tuple_element<_Indx,
429 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...
430 {}
431
432 template <class _Tuple>
433 _LIBCPP_INLINE_VISIBILITY
434 typename enable_if
435 <
436 __tuple_assignable<_Tuple, tuple<_Tp...> >::value,
437 __tuple_impl&
438 >::type
439 operator=(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_assignable<_Tp&, typename tuple_element<_Indx,
440 typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
441 {
442 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<typename tuple_element<_Indx,
443 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...);
444 return *this;
445 }
446
447 __tuple_impl(const __tuple_impl&) = default;
448 __tuple_impl(__tuple_impl&&) = default;
449
450 _LIBCPP_INLINE_VISIBILITY
451 __tuple_impl&
452 operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
453 {
454 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
455 return *this;
456 }
457
458 _LIBCPP_INLINE_VISIBILITY
459 __tuple_impl&
460 operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value))
461 {
462 __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...);
463 return *this;
464 }
465
466 _LIBCPP_INLINE_VISIBILITY
467 void swap(__tuple_impl& __t)
468 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
469 {
470 __swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...);
471 }
472};
473
474
475
476template <class ..._Tp>
477class _LIBCPP_TEMPLATE_VIS tuple
478{
479 typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> _BaseT;
480
481 _BaseT __base_;
482
483#if defined(_LIBCPP_ENABLE_TUPLE_IMPLICIT_REDUCED_ARITY_EXTENSION)
484 static constexpr bool _EnableImplicitReducedArityExtension = true;
485#else
486 static constexpr bool _EnableImplicitReducedArityExtension = false;
487#endif
488
489 template <class ..._Args>
490 struct _PackExpandsToThisTuple : false_type {};
491
492 template <class _Arg>
493 struct _PackExpandsToThisTuple<_Arg>
494 : is_same<typename __uncvref<_Arg>::type, tuple> {};
495
496 template <bool _MaybeEnable, class _Dummy = void>
497 struct _CheckArgsConstructor : __check_tuple_constructor_fail {};
498
499 template <class _Dummy>
500 struct _CheckArgsConstructor<true, _Dummy>
501 {
502 template <int&...>
503 static constexpr bool __enable_implicit_default() {
504 return __all<__is_implicitly_default_constructible<_Tp>::value... >::value;
505 }
506
507 template <int&...>
508 static constexpr bool __enable_explicit_default() {
509 return
510 __all<is_default_constructible<_Tp>::value...>::value &&
511 !__enable_implicit_default< >();
512 }
513
514
515 template <class ..._Args>
516 static constexpr bool __enable_explicit() {
517 return
518 __tuple_constructible<
519 tuple<_Args...>,
520 typename __make_tuple_types<tuple,
521 sizeof...(_Args) < sizeof...(_Tp) ?
522 sizeof...(_Args) :
523 sizeof...(_Tp)>::type
524 >::value &&
525 !__tuple_convertible<
526 tuple<_Args...>,
527 typename __make_tuple_types<tuple,
528 sizeof...(_Args) < sizeof...(_Tp) ?
529 sizeof...(_Args) :
530 sizeof...(_Tp)>::type
531 >::value &&
532 __all_default_constructible<
533 typename __make_tuple_types<tuple, sizeof...(_Tp),
534 sizeof...(_Args) < sizeof...(_Tp) ?
535 sizeof...(_Args) :
536 sizeof...(_Tp)>::type
537 >::value;
538 }
539
540 template <class ..._Args>
541 static constexpr bool __enable_implicit() {
542 return
543 __tuple_constructible<
544 tuple<_Args...>,
545 typename __make_tuple_types<tuple,
546 sizeof...(_Args) < sizeof...(_Tp) ?
547 sizeof...(_Args) :
548 sizeof...(_Tp)>::type
549 >::value &&
550 __tuple_convertible<
551 tuple<_Args...>,
552 typename __make_tuple_types<tuple,
553 sizeof...(_Args) < sizeof...(_Tp) ?
554 sizeof...(_Args) :
555 sizeof...(_Tp)>::type
556 >::value &&
557 __all_default_constructible<
558 typename __make_tuple_types<tuple, sizeof...(_Tp),
559 sizeof...(_Args) < sizeof...(_Tp) ?
560 sizeof...(_Args) :
561 sizeof...(_Tp)>::type
562 >::value;
563 }
564 };
565
566 template <bool _MaybeEnable,
567 bool = sizeof...(_Tp) == 1,
568 class _Dummy = void>
569 struct _CheckTupleLikeConstructor : __check_tuple_constructor_fail {};
570
571 template <class _Dummy>
572 struct _CheckTupleLikeConstructor<true, false, _Dummy>
573 {
574 template <class _Tuple>
575 static constexpr bool __enable_implicit() {
576 return __tuple_constructible<_Tuple, tuple>::value
577 && __tuple_convertible<_Tuple, tuple>::value;
578 }
579
580 template <class _Tuple>
581 static constexpr bool __enable_explicit() {
582 return __tuple_constructible<_Tuple, tuple>::value
583 && !__tuple_convertible<_Tuple, tuple>::value;
584 }
585 };
586
587 template <class _Dummy>
588 struct _CheckTupleLikeConstructor<true, true, _Dummy>
589 {
590 // This trait is used to disable the tuple-like constructor when
591 // the UTypes... constructor should be selected instead.
592 // See LWG issue #2549.
593 template <class _Tuple>
594 using _PreferTupleLikeConstructor = _Or<
595 // Don't attempt the two checks below if the tuple we are given
596 // has the same type as this tuple.
597 _IsSame<__uncvref_t<_Tuple>, tuple>,
598 _Lazy<_And,
599 _Not<is_constructible<_Tp..., _Tuple>>,
600 _Not<is_convertible<_Tuple, _Tp...>>
601 >
602 >;
603
604 template <class _Tuple>
605 static constexpr bool __enable_implicit() {
606 return _And<
607 __tuple_constructible<_Tuple, tuple>,
608 __tuple_convertible<_Tuple, tuple>,
609 _PreferTupleLikeConstructor<_Tuple>
610 >::value;
611 }
612
613 template <class _Tuple>
614 static constexpr bool __enable_explicit() {
615 return _And<
616 __tuple_constructible<_Tuple, tuple>,
617 _PreferTupleLikeConstructor<_Tuple>,
618 _Not<__tuple_convertible<_Tuple, tuple>>
619 >::value;
620 }
621 };
622
623 template <class _Tuple, bool _DisableIfLValue>
624 using _EnableImplicitTupleLikeConstructor = _EnableIf<
625 _CheckTupleLikeConstructor<
626 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
627 && !_PackExpandsToThisTuple<_Tuple>::value
628 && (!is_lvalue_reference<_Tuple>::value || !_DisableIfLValue)
629 >::template __enable_implicit<_Tuple>(),
630 bool
631 >;
632
633 template <class _Tuple, bool _DisableIfLValue>
634 using _EnableExplicitTupleLikeConstructor = _EnableIf<
635 _CheckTupleLikeConstructor<
636 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
637 && !_PackExpandsToThisTuple<_Tuple>::value
638 && (!is_lvalue_reference<_Tuple>::value || !_DisableIfLValue)
639 >::template __enable_explicit<_Tuple>(),
640 bool
641 >;
642 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
643 typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
644 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
645 const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT;
646 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
647 typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT;
648 template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
649 const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT;
650public:
651
652 template <bool _Dummy = true, _EnableIf<
653 _CheckArgsConstructor<_Dummy>::__enable_implicit_default()
654 , void*> = nullptr>
655 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
656 tuple()
657 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
658
659 template <bool _Dummy = true, _EnableIf<
660 _CheckArgsConstructor<_Dummy>::__enable_explicit_default()
661 , void*> = nullptr>
662 explicit _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
663 tuple()
664 _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
665
666 tuple(tuple const&) = default;
667 tuple(tuple&&) = default;
668
669 template <class _AllocArgT, class _Alloc, _EnableIf<
670 _CheckArgsConstructor<_IsSame<allocator_arg_t, _AllocArgT>::value >::__enable_implicit_default()
671 , void*> = nullptr
672 >
673 _LIBCPP_INLINE_VISIBILITY
674 tuple(_AllocArgT, _Alloc const& __a)
675 : __base_(allocator_arg_t(), __a,
676 __tuple_indices<>(), __tuple_types<>(),
677 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
678 __tuple_types<_Tp...>()) {}
679
680 template <class _AllocArgT, class _Alloc, _EnableIf<
681 _CheckArgsConstructor<_IsSame<allocator_arg_t, _AllocArgT>::value>::__enable_explicit_default()
682 , void*> = nullptr
683 >
684 explicit _LIBCPP_INLINE_VISIBILITY
685 tuple(_AllocArgT, _Alloc const& __a)
686 : __base_(allocator_arg_t(), __a,
687 __tuple_indices<>(), __tuple_types<>(),
688 typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
689 __tuple_types<_Tp...>()) {}
690
691 template <bool _Dummy = true,
692 typename enable_if
693 <
694 _CheckArgsConstructor<
695 _Dummy
696 >::template __enable_implicit<_Tp const&...>(),
697 bool
698 >::type = false
699 >
700 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
701 tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value))
702 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
703 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
704 typename __make_tuple_indices<0>::type(),
705 typename __make_tuple_types<tuple, 0>::type(),
706 __t...
707 ) {}
708
709 template <bool _Dummy = true,
710 typename enable_if
711 <
712 _CheckArgsConstructor<
713 _Dummy
714 >::template __enable_explicit<_Tp const&...>(),
715 bool
716 >::type = false
717 >
718 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
719 explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value))
720 : __base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
721 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
722 typename __make_tuple_indices<0>::type(),
723 typename __make_tuple_types<tuple, 0>::type(),
724 __t...
725 ) {}
726
727 template <class _Alloc, bool _Dummy = true,
728 typename enable_if
729 <
730 _CheckArgsConstructor<
731 _Dummy
732 >::template __enable_implicit<_Tp const&...>(),
733 bool
734 >::type = false
735 >
736 _LIBCPP_INLINE_VISIBILITY
737 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
738 : __base_(allocator_arg_t(), __a,
739 typename __make_tuple_indices<sizeof...(_Tp)>::type(),
740 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
741 typename __make_tuple_indices<0>::type(),
742 typename __make_tuple_types<tuple, 0>::type(),
743 __t...
744 ) {}
745
746 template <class _Alloc, bool _Dummy = true,
747 typename enable_if
748 <
749 _CheckArgsConstructor<
750 _Dummy
751 >::template __enable_explicit<_Tp const&...>(),
752 bool
753 >::type = false
754 >
755 _LIBCPP_INLINE_VISIBILITY
756 explicit
757 tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
758 : __base_(allocator_arg_t(), __a,
759 typename __make_tuple_indices<sizeof...(_Tp)>::type(),
760 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
761 typename __make_tuple_indices<0>::type(),
762 typename __make_tuple_types<tuple, 0>::type(),
763 __t...
764 ) {}
765
766 template <class ..._Up,
767 bool _PackIsTuple = _PackExpandsToThisTuple<_Up...>::value,
768 typename enable_if
769 <
770 _CheckArgsConstructor<
771 sizeof...(_Up) == sizeof...(_Tp)
772 && !_PackIsTuple
773 >::template __enable_implicit<_Up...>() ||
774 _CheckArgsConstructor<
775 _EnableImplicitReducedArityExtension
776 && sizeof...(_Up) < sizeof...(_Tp)
777 && !_PackIsTuple
778 >::template __enable_implicit<_Up...>(),
779 bool
780 >::type = false
781 >
782 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
783 tuple(_Up&&... __u)
784 _NOEXCEPT_((
785 is_nothrow_constructible<_BaseT,
786 typename __make_tuple_indices<sizeof...(_Up)>::type,
787 typename __make_tuple_types<tuple, sizeof...(_Up)>::type,
788 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type,
789 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type,
790 _Up...
791 >::value
792 ))
793 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
794 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
795 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
796 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
797 _VSTD::forward<_Up>(__u)...) {}
798
799 template <class ..._Up,
800 typename enable_if
801 <
802 _CheckArgsConstructor<
803 sizeof...(_Up) <= sizeof...(_Tp)
804 && !_PackExpandsToThisTuple<_Up...>::value
805 >::template __enable_explicit<_Up...>() ||
806 _CheckArgsConstructor<
807 !_EnableImplicitReducedArityExtension
808 && sizeof...(_Up) < sizeof...(_Tp)
809 && !_PackExpandsToThisTuple<_Up...>::value
810 >::template __enable_implicit<_Up...>(),
811 bool
812 >::type = false
813 >
814 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
815 explicit
816 tuple(_Up&&... __u)
817 _NOEXCEPT_((
818 is_nothrow_constructible<_BaseT,
819 typename __make_tuple_indices<sizeof...(_Up)>::type,
820 typename __make_tuple_types<tuple, sizeof...(_Up)>::type,
821 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type,
822 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type,
823 _Up...
824 >::value
825 ))
826 : __base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
827 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
828 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
829 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
830 _VSTD::forward<_Up>(__u)...) {}
831
832 template <class _Alloc, class ..._Up,
833 typename enable_if
834 <
835 _CheckArgsConstructor<
836 sizeof...(_Up) == sizeof...(_Tp) &&
837 !_PackExpandsToThisTuple<_Up...>::value
838 >::template __enable_implicit<_Up...>(),
839 bool
840 >::type = false
841 >
842 _LIBCPP_INLINE_VISIBILITY
843 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
844 : __base_(allocator_arg_t(), __a,
845 typename __make_tuple_indices<sizeof...(_Up)>::type(),
846 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
847 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
848 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
849 _VSTD::forward<_Up>(__u)...) {}
850
851 template <class _Alloc, class ..._Up,
852 typename enable_if
853 <
854 _CheckArgsConstructor<
855 sizeof...(_Up) == sizeof...(_Tp) &&
856 !_PackExpandsToThisTuple<_Up...>::value
857 >::template __enable_explicit<_Up...>(),
858 bool
859 >::type = false
860 >
861 _LIBCPP_INLINE_VISIBILITY
862 explicit
863 tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
864 : __base_(allocator_arg_t(), __a,
865 typename __make_tuple_indices<sizeof...(_Up)>::type(),
866 typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
867 typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
868 typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
869 _VSTD::forward<_Up>(__u)...) {}
870
871 template <class _Tuple, _EnableImplicitTupleLikeConstructor<_Tuple, true> = false>
872 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
873 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, _Tuple>::value))
874 : __base_(_VSTD::forward<_Tuple>(__t)) {}
875
876 template <class _Tuple, _EnableImplicitTupleLikeConstructor<const _Tuple&, false> = false>
877 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
878 tuple(const _Tuple& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, const _Tuple&>::value))
879 : __base_(__t) {}
880 template <class _Tuple, _EnableExplicitTupleLikeConstructor<_Tuple, true> = false>
881 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
882 explicit
883 tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, _Tuple>::value))
884 : __base_(_VSTD::forward<_Tuple>(__t)) {}
885
886 template <class _Tuple, _EnableExplicitTupleLikeConstructor<const _Tuple&, false> = false>
887 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
888 explicit
889 tuple(const _Tuple& __t) _NOEXCEPT_((is_nothrow_constructible<_BaseT, const _Tuple&>::value))
890 : __base_(__t) {}
891
892 template <class _Alloc, class _Tuple,
893 typename enable_if
894 <
895 _CheckTupleLikeConstructor<
896 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
897 >::template __enable_implicit<_Tuple>(),
898 bool
899 >::type = false
900 >
901 _LIBCPP_INLINE_VISIBILITY
902 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
903 : __base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
904
905 template <class _Alloc, class _Tuple,
906 typename enable_if
907 <
908 _CheckTupleLikeConstructor<
909 __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
910 >::template __enable_explicit<_Tuple>(),
911 bool
912 >::type = false
913 >
914 _LIBCPP_INLINE_VISIBILITY
915 explicit
916 tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
917 : __base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
918
919 using _CanCopyAssign = __all<is_copy_assignable<_Tp>::value...>;
920 using _CanMoveAssign = __all<is_move_assignable<_Tp>::value...>;
921
922 _LIBCPP_INLINE_VISIBILITY
923 tuple& operator=(typename conditional<_CanCopyAssign::value, tuple, __nat>::type const& __t)
924 _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
925 {
926 __base_.operator=(__t.__base_);
927 return *this;
928 }
929
930 _LIBCPP_INLINE_VISIBILITY
931 tuple& operator=(typename conditional<_CanMoveAssign::value, tuple, __nat>::type&& __t)
932 _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value))
933 {
934 __base_.operator=(static_cast<_BaseT&&>(__t.__base_));
935 return *this;
936 }
937
938 template <class _Tuple,
939 class = typename enable_if
940 <
941 __tuple_assignable<_Tuple, tuple>::value
942 >::type
943 >
944 _LIBCPP_INLINE_VISIBILITY
945 tuple&
946 operator=(_Tuple&& __t) _NOEXCEPT_((is_nothrow_assignable<_BaseT&, _Tuple>::value))
947 {
948 __base_.operator=(_VSTD::forward<_Tuple>(__t));
949 return *this;
950 }
951
952 _LIBCPP_INLINE_VISIBILITY
953 void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
954 {__base_.swap(__t.__base_);}
955};
956
957template <>
958class _LIBCPP_TEMPLATE_VIS tuple<>
959{
960public:
961 _LIBCPP_INLINE_VISIBILITY
962 _LIBCPP_CONSTEXPR tuple() _NOEXCEPT = default;
963 template <class _Alloc>
964 _LIBCPP_INLINE_VISIBILITY
965 tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
966 template <class _Alloc>
967 _LIBCPP_INLINE_VISIBILITY
968 tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {}
969 template <class _Up>
970 _LIBCPP_INLINE_VISIBILITY
971 tuple(array<_Up, 0>) _NOEXCEPT {}
972 template <class _Alloc, class _Up>
973 _LIBCPP_INLINE_VISIBILITY
974 tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
975 _LIBCPP_INLINE_VISIBILITY
976 void swap(tuple&) _NOEXCEPT {}
977};
978
979#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
980template <class ..._Tp>
981tuple(_Tp...) -> tuple<_Tp...>;
982template <class _Tp1, class _Tp2>
983tuple(pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
984template <class _Alloc, class ..._Tp>
985tuple(allocator_arg_t, _Alloc, _Tp...) -> tuple<_Tp...>;
986template <class _Alloc, class _Tp1, class _Tp2>
987tuple(allocator_arg_t, _Alloc, pair<_Tp1, _Tp2>) -> tuple<_Tp1, _Tp2>;
988template <class _Alloc, class ..._Tp>
989tuple(allocator_arg_t, _Alloc, tuple<_Tp...>) -> tuple<_Tp...>;
990#endif
991
992template <class ..._Tp>
993inline _LIBCPP_INLINE_VISIBILITY
994typename enable_if
995<
996 __all<__is_swappable<_Tp>::value...>::value,
997 void
998>::type
999swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u)
1000 _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
1001 {__t.swap(__u);}
1002
1003// get
1004
1005template <size_t _Ip, class ..._Tp>
1006inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1007typename tuple_element<_Ip, tuple<_Tp...> >::type&
1008get(tuple<_Tp...>& __t) _NOEXCEPT
1009{
1010 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
1011 return static_cast<__tuple_leaf<_Ip, type>&>(__t.__base_).get();
1012}
1013
1014template <size_t _Ip, class ..._Tp>
1015inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1016const typename tuple_element<_Ip, tuple<_Tp...> >::type&
1017get(const tuple<_Tp...>& __t) _NOEXCEPT
1018{
1019 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
1020 return static_cast<const __tuple_leaf<_Ip, type>&>(__t.__base_).get();
1021}
1022
1023template <size_t _Ip, class ..._Tp>
1024inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1025typename tuple_element<_Ip, tuple<_Tp...> >::type&&
1026get(tuple<_Tp...>&& __t) _NOEXCEPT
1027{
1028 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
1029 return static_cast<type&&>(
1030 static_cast<__tuple_leaf<_Ip, type>&&>(__t.__base_).get());
1031}
1032
1033template <size_t _Ip, class ..._Tp>
1034inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1035const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
1036get(const tuple<_Tp...>&& __t) _NOEXCEPT
1037{
1038 typedef _LIBCPP_NODEBUG_TYPE typename tuple_element<_Ip, tuple<_Tp...> >::type type;
1039 return static_cast<const type&&>(
1040 static_cast<const __tuple_leaf<_Ip, type>&&>(__t.__base_).get());
1041}
1042
1043#if _LIBCPP_STD_VER > 11
1044
1045namespace __find_detail {
1046
1047static constexpr size_t __not_found = -1;
1048static constexpr size_t __ambiguous = __not_found - 1;
1049
1050inline _LIBCPP_INLINE_VISIBILITY
1051constexpr size_t __find_idx_return(size_t __curr_i, size_t __res, bool __matches) {
1052 return !__matches ? __res :
1053 (__res == __not_found ? __curr_i : __ambiguous);
1054}
1055
1056template <size_t _Nx>
1057inline _LIBCPP_INLINE_VISIBILITY
1058constexpr size_t __find_idx(size_t __i, const bool (&__matches)[_Nx]) {
1059 return __i == _Nx ? __not_found :
1060 __find_idx_return(__i, __find_idx(__i + 1, __matches), __matches[__i]);
1061}
1062
1063template <class _T1, class ..._Args>
1064struct __find_exactly_one_checked {
1065 static constexpr bool __matches[sizeof...(_Args)] = {is_same<_T1, _Args>::value...};
1066 static constexpr size_t value = __find_detail::__find_idx(0, __matches);
1067 static_assert(value != __not_found, "type not found in type list" );
1068 static_assert(value != __ambiguous, "type occurs more than once in type list");
1069};
1070
1071template <class _T1>
1072struct __find_exactly_one_checked<_T1> {
1073 static_assert(!is_same<_T1, _T1>::value, "type not in empty type list");
1074};
1075
1076} // namespace __find_detail;
1077
1078template <typename _T1, typename... _Args>
1079struct __find_exactly_one_t
1080 : public __find_detail::__find_exactly_one_checked<_T1, _Args...> {
1081};
1082
1083template <class _T1, class... _Args>
1084inline _LIBCPP_INLINE_VISIBILITY
1085constexpr _T1& get(tuple<_Args...>& __tup) noexcept
1086{
1087 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
1088}
1089
1090template <class _T1, class... _Args>
1091inline _LIBCPP_INLINE_VISIBILITY
1092constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept
1093{
1094 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
1095}
1096
1097template <class _T1, class... _Args>
1098inline _LIBCPP_INLINE_VISIBILITY
1099constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept
1100{
1101 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
1102}
1103
1104template <class _T1, class... _Args>
1105inline _LIBCPP_INLINE_VISIBILITY
1106constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept
1107{
1108 return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
1109}
1110
1111#endif
1112
1113// tie
1114
1115template <class ..._Tp>
1116inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1117tuple<_Tp&...>
1118tie(_Tp&... __t) _NOEXCEPT
1119{
1120 return tuple<_Tp&...>(__t...);
1121}
1122
1123template <class _Up>
1124struct __ignore_t
1125{
1126 template <class _Tp>
1127 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1128 const __ignore_t& operator=(_Tp&&) const {return *this;}
1129};
1130
1131namespace {
1132 _LIBCPP_INLINE_VAR constexpr __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>();
1133}
1134
1135template <class... _Tp>
1136inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1137tuple<typename __unwrap_ref_decay<_Tp>::type...>
1138make_tuple(_Tp&&... __t)
1139{
1140 return tuple<typename __unwrap_ref_decay<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...);
1141}
1142
1143template <class... _Tp>
1144inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1145tuple<_Tp&&...>
1146forward_as_tuple(_Tp&&... __t) _NOEXCEPT
1147{
1148 return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...);
1149}
1150
1151template <size_t _Ip>
1152struct __tuple_equal
1153{
1154 template <class _Tp, class _Up>
1155 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1156 bool operator()(const _Tp& __x, const _Up& __y)
1157 {
1158 return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y);
1159 }
1160};
1161
1162template <>
1163struct __tuple_equal<0>
1164{
1165 template <class _Tp, class _Up>
1166 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1167 bool operator()(const _Tp&, const _Up&)
1168 {
1169 return true;
1170 }
1171};
1172
1173template <class ..._Tp, class ..._Up>
1174inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1175bool
1176operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
1177{
1178 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
1179 return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
1180}
1181
1182template <class ..._Tp, class ..._Up>
1183inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1184bool
1185operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
1186{
1187 return !(__x == __y);
1188}
1189
1190template <size_t _Ip>
1191struct __tuple_less
1192{
1193 template <class _Tp, class _Up>
1194 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1195 bool operator()(const _Tp& __x, const _Up& __y)
1196 {
1197 const size_t __idx = tuple_size<_Tp>::value - _Ip;
1198 if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y))
1199 return true;
1200 if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x))
1201 return false;
1202 return __tuple_less<_Ip-1>()(__x, __y);
1203 }
1204};
1205
1206template <>
1207struct __tuple_less<0>
1208{
1209 template <class _Tp, class _Up>
1210 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1211 bool operator()(const _Tp&, const _Up&)
1212 {
1213 return false;
1214 }
1215};
1216
1217template <class ..._Tp, class ..._Up>
1218inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1219bool
1220operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
1221{
1222 static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
1223 return __tuple_less<sizeof...(_Tp)>()(__x, __y);
1224}
1225
1226template <class ..._Tp, class ..._Up>
1227inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1228bool
1229operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
1230{
1231 return __y < __x;
1232}
1233
1234template <class ..._Tp, class ..._Up>
1235inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1236bool
1237operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
1238{
1239 return !(__x < __y);
1240}
1241
1242template <class ..._Tp, class ..._Up>
1243inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1244bool
1245operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
1246{
1247 return !(__y < __x);
1248}
1249
1250// tuple_cat
1251
1252template <class _Tp, class _Up> struct __tuple_cat_type;
1253
1254template <class ..._Ttypes, class ..._Utypes>
1255struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> >
1256{
1257 typedef _LIBCPP_NODEBUG_TYPE tuple<_Ttypes..., _Utypes...> type;
1258};
1259
1260template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples>
1261struct __tuple_cat_return_1
1262{
1263};
1264
1265template <class ..._Types, class _Tuple0>
1266struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0>
1267{
1268 typedef _LIBCPP_NODEBUG_TYPE typename __tuple_cat_type<tuple<_Types...>,
1269 typename __make_tuple_types<typename __uncvref<_Tuple0>::type>::type>::type
1270 type;
1271};
1272
1273template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples>
1274struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...>
1275 : public __tuple_cat_return_1<
1276 typename __tuple_cat_type<
1277 tuple<_Types...>,
1278 typename __make_tuple_types<typename __uncvref<_Tuple0>::type>::type
1279 >::type,
1280 __tuple_like<typename remove_reference<_Tuple1>::type>::value,
1281 _Tuple1, _Tuples...>
1282{
1283};
1284
1285template <class ..._Tuples> struct __tuple_cat_return;
1286
1287template <class _Tuple0, class ..._Tuples>
1288struct __tuple_cat_return<_Tuple0, _Tuples...>
1289 : public __tuple_cat_return_1<tuple<>,
1290 __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0,
1291 _Tuples...>
1292{
1293};
1294
1295template <>
1296struct __tuple_cat_return<>
1297{
1298 typedef _LIBCPP_NODEBUG_TYPE tuple<> type;
1299};
1300
1301inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1302tuple<>
1303tuple_cat()
1304{
1305 return tuple<>();
1306}
1307
1308template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples>
1309struct __tuple_cat_return_ref_imp;
1310
1311template <class ..._Types, size_t ..._I0, class _Tuple0>
1312struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0>
1313{
1314 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0;
1315 typedef tuple<_Types..., typename __apply_cv<_Tuple0,
1316 typename tuple_element<_I0, _T0>::type>::type&&...> type;
1317};
1318
1319template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples>
1320struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>,
1321 _Tuple0, _Tuple1, _Tuples...>
1322 : public __tuple_cat_return_ref_imp<
1323 tuple<_Types..., typename __apply_cv<_Tuple0,
1324 typename tuple_element<_I0,
1325 typename remove_reference<_Tuple0>::type>::type>::type&&...>,
1326 typename __make_tuple_indices<tuple_size<typename
1327 remove_reference<_Tuple1>::type>::value>::type,
1328 _Tuple1, _Tuples...>
1329{
1330};
1331
1332template <class _Tuple0, class ..._Tuples>
1333struct __tuple_cat_return_ref
1334 : public __tuple_cat_return_ref_imp<tuple<>,
1335 typename __make_tuple_indices<
1336 tuple_size<typename remove_reference<_Tuple0>::type>::value
1337 >::type, _Tuple0, _Tuples...>
1338{
1339};
1340
1341template <class _Types, class _I0, class _J0>
1342struct __tuple_cat;
1343
1344template <class ..._Types, size_t ..._I0, size_t ..._J0>
1345struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> >
1346{
1347 template <class _Tuple0>
1348 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1349 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
1350 operator()(tuple<_Types...> __t, _Tuple0&& __t0)
1351 {
1352 return _VSTD::forward_as_tuple(
1353 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))...,
1354 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...);
1355 }
1356
1357 template <class _Tuple0, class _Tuple1, class ..._Tuples>
1358 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1359 typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
1360 operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls)
1361 {
1362 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0;
1363 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple1>::type _T1;
1364 return __tuple_cat<
1365 tuple<_Types...,
1366 typename __apply_cv<_Tuple0, typename tuple_element<
1367 _J0, _T0>::type>::type&&...>,
1368 typename __make_tuple_indices<sizeof...(_Types) +
1369 tuple_size<_T0>::value>::type,
1370 typename __make_tuple_indices<tuple_size<_T1>::value>::type>()(
1371 _VSTD::forward_as_tuple(
1372 _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))...,
1373 _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...),
1374 _VSTD::forward<_Tuple1>(__t1), _VSTD::forward<_Tuples>(__tpls)...);
1375 }
1376};
1377
1378template <class _Tuple0, class... _Tuples>
1379inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1380typename __tuple_cat_return<_Tuple0, _Tuples...>::type
1381tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls)
1382{
1383 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tuple0>::type _T0;
1384 return __tuple_cat<tuple<>, __tuple_indices<>,
1385 typename __make_tuple_indices<tuple_size<_T0>::value>::type>()
1386 (tuple<>(), _VSTD::forward<_Tuple0>(__t0),
1387 _VSTD::forward<_Tuples>(__tpls)...);
1388}
1389
1390template <class ..._Tp, class _Alloc>
1391struct _LIBCPP_TEMPLATE_VIS uses_allocator<tuple<_Tp...>, _Alloc>
1392 : true_type {};
1393
1394template <class _T1, class _T2>
1395template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2>
1396inline _LIBCPP_INLINE_VISIBILITY
1397pair<_T1, _T2>::pair(piecewise_construct_t,
1398 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
1399 __tuple_indices<_I1...>, __tuple_indices<_I2...>)
1400 : first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...),
1401 second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...)
1402{
1403}
1404
1405#if _LIBCPP_STD_VER > 14
1406template <class _Tp>
1407_LIBCPP_INLINE_VAR constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
1408
1409#define _LIBCPP_NOEXCEPT_RETURN(...) noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; }
1410
1411template <class _Fn, class _Tuple, size_t ..._Id>
1412inline _LIBCPP_INLINE_VISIBILITY
1413constexpr decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t,
1414 __tuple_indices<_Id...>)
1415_LIBCPP_NOEXCEPT_RETURN(
1416 _VSTD::__invoke_constexpr(
1417 _VSTD::forward<_Fn>(__f),
1418 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...)
1419)
1420
1421template <class _Fn, class _Tuple>
1422inline _LIBCPP_INLINE_VISIBILITY
1423constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t)
1424_LIBCPP_NOEXCEPT_RETURN(
1425 _VSTD::__apply_tuple_impl(
1426 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t),
1427 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})
1428)
1429
1430template <class _Tp, class _Tuple, size_t... _Idx>
1431inline _LIBCPP_INLINE_VISIBILITY
1432constexpr _Tp __make_from_tuple_impl(_Tuple&& __t, __tuple_indices<_Idx...>)
1433_LIBCPP_NOEXCEPT_RETURN(
1434 _Tp(_VSTD::get<_Idx>(_VSTD::forward<_Tuple>(__t))...)
1435)
1436
1437template <class _Tp, class _Tuple>
1438inline _LIBCPP_INLINE_VISIBILITY
1439constexpr _Tp make_from_tuple(_Tuple&& __t)
1440_LIBCPP_NOEXCEPT_RETURN(
1441 _VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t),
1442 typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})
1443)
1444
1445#undef _LIBCPP_NOEXCEPT_RETURN
1446
1447#endif // _LIBCPP_STD_VER > 14
1448
1449#endif // !defined(_LIBCPP_CXX03_LANG)
1450
1451_LIBCPP_END_NAMESPACE_STD
1452
1453#endif // _LIBCPP_TUPLE
1454