1// -*- C++ -*-
2//===-------------------------- utility -----------------------------------===//
3//
4// The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_UTILITY
12#define _LIBCPP_UTILITY
13
14/*
15 utility synopsis
16
17namespace std
18{
19
20template <class T>
21 void
22 swap(T& a, T& b);
23
24namespace rel_ops
25{
26 template<class T> bool operator!=(const T&, const T&);
27 template<class T> bool operator> (const T&, const T&);
28 template<class T> bool operator<=(const T&, const T&);
29 template<class T> bool operator>=(const T&, const T&);
30}
31
32template<class T>
33void
34swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value &&
35 is_nothrow_move_assignable<T>::value);
36
37template <class T, size_t N>
38void
39swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));
40
41template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14
42template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14
43
44template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14
45
46template <class T>
47 typename conditional
48 <
49 !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
50 const T&,
51 T&&
52 >::type
53 move_if_noexcept(T& x) noexcept; // constexpr in C++14
54
55template <class T> constexpr add_const<T>_t& as_const(T& t) noexcept; // C++17
56template <class T> void as_const(const T&&) = delete; // C++17
57
58template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
59
60template <class T1, class T2>
61struct pair
62{
63 typedef T1 first_type;
64 typedef T2 second_type;
65
66 T1 first;
67 T2 second;
68
69 pair(const pair&) = default;
70 pair(pair&&) = default;
71 constexpr pair();
72 pair(const T1& x, const T2& y); // constexpr in C++14
73 template <class U, class V> pair(U&& x, V&& y); // constexpr in C++14
74 template <class U, class V> pair(const pair<U, V>& p); // constexpr in C++14
75 template <class U, class V> pair(pair<U, V>&& p); // constexpr in C++14
76 template <class... Args1, class... Args2>
77 pair(piecewise_construct_t, tuple<Args1...> first_args,
78 tuple<Args2...> second_args);
79
80 template <class U, class V> pair& operator=(const pair<U, V>& p);
81 pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value &&
82 is_nothrow_move_assignable<T2>::value);
83 template <class U, class V> pair& operator=(pair<U, V>&& p);
84
85 void swap(pair& p) noexcept(is_nothrow_swappable_v<T1> &&
86 is_nothrow_swappable_v<T2>);
87};
88
89template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
90template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
91template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
92template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
93template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
94template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
95
96template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14
97template <class T1, class T2>
98void
99swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
100
101struct piecewise_construct_t { };
102constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
103
104template <class T> class tuple_size;
105template <size_t I, class T> class tuple_element;
106
107template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
108template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >;
109template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >;
110
111template<size_t I, class T1, class T2>
112 typename tuple_element<I, pair<T1, T2> >::type&
113 get(pair<T1, T2>&) noexcept; // constexpr in C++14
114
115template<size_t I, class T1, class T2>
116 const typename tuple_element<I, pair<T1, T2> >::type&
117 get(const pair<T1, T2>&) noexcept; // constexpr in C++14
118
119template<size_t I, class T1, class T2>
120 typename tuple_element<I, pair<T1, T2> >::type&&
121 get(pair<T1, T2>&&) noexcept; // constexpr in C++14
122
123template<size_t I, class T1, class T2>
124 const typename tuple_element<I, pair<T1, T2> >::type&&
125 get(const pair<T1, T2>&&) noexcept; // constexpr in C++14
126
127template<class T1, class T2>
128 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
129
130template<class T1, class T2>
131 constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14
132
133template<class T1, class T2>
134 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14
135
136template<class T1, class T2>
137 constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14
138
139template<class T1, class T2>
140 constexpr T1& get(pair<T2, T1>&) noexcept; // C++14
141
142template<class T1, class T2>
143 constexpr const T1& get(const pair<T2, T1>&) noexcept; // C++14
144
145template<class T1, class T2>
146 constexpr T1&& get(pair<T2, T1>&&) noexcept; // C++14
147
148template<class T1, class T2>
149 constexpr const T1&& get(const pair<T2, T1>&&) noexcept; // C++14
150
151// C++14
152
153template<class T, T... I>
154struct integer_sequence
155{
156 typedef T value_type;
157
158 static constexpr size_t size() noexcept;
159};
160
161template<size_t... I>
162 using index_sequence = integer_sequence<size_t, I...>;
163
164template<class T, T N>
165 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
166template<size_t N>
167 using make_index_sequence = make_integer_sequence<size_t, N>;
168
169template<class... T>
170 using index_sequence_for = make_index_sequence<sizeof...(T)>;
171
172template<class T, class U=T>
173 T exchange(T& obj, U&& new_value);
174} // std
175
176*/
177
178#include <__config>
179#include <__tuple>
180#include <type_traits>
181#include <initializer_list>
182
183#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
184#pragma GCC system_header
185#endif
186
187_LIBCPP_BEGIN_NAMESPACE_STD
188
189namespace rel_ops
190{
191
192template<class _Tp>
193inline _LIBCPP_INLINE_VISIBILITY
194bool
195operator!=(const _Tp& __x, const _Tp& __y)
196{
197 return !(__x == __y);
198}
199
200template<class _Tp>
201inline _LIBCPP_INLINE_VISIBILITY
202bool
203operator> (const _Tp& __x, const _Tp& __y)
204{
205 return __y < __x;
206}
207
208template<class _Tp>
209inline _LIBCPP_INLINE_VISIBILITY
210bool
211operator<=(const _Tp& __x, const _Tp& __y)
212{
213 return !(__y < __x);
214}
215
216template<class _Tp>
217inline _LIBCPP_INLINE_VISIBILITY
218bool
219operator>=(const _Tp& __x, const _Tp& __y)
220{
221 return !(__x < __y);
222}
223
224} // rel_ops
225
226// swap_ranges
227
228
229template <class _ForwardIterator1, class _ForwardIterator2>
230inline _LIBCPP_INLINE_VISIBILITY
231_ForwardIterator2
232swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
233{
234 for(; __first1 != __last1; ++__first1, (void) ++__first2)
235 swap(*__first1, *__first2);
236 return __first2;
237}
238
239// forward declared in <type_traits>
240template<class _Tp, size_t _Np>
241inline _LIBCPP_INLINE_VISIBILITY
242typename enable_if<
243 __is_swappable<_Tp>::value
244>::type
245swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
246{
247 _VSTD::swap_ranges(__a, __a + _Np, __b);
248}
249
250template <class _Tp>
251inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
252#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
253typename conditional
254<
255 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
256 const _Tp&,
257 _Tp&&
258>::type
259#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
260const _Tp&
261#endif
262move_if_noexcept(_Tp& __x) _NOEXCEPT
263{
264 return _VSTD::move(__x);
265}
266
267#if _LIBCPP_STD_VER > 14
268template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
269template <class _Tp> void as_const(const _Tp&&) = delete;
270#endif
271
272struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { };
273#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY)
274extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
275#else
276constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
277#endif
278
279template <class _T1, class _T2>
280struct _LIBCPP_TYPE_VIS_ONLY pair
281{
282 typedef _T1 first_type;
283 typedef _T2 second_type;
284
285 _T1 first;
286 _T2 second;
287
288#ifndef _LIBCPP_HAS_NO_DEFAULT_FUNCTION_TEMPLATE_ARGS
289 template <bool _Dummy = true, class = typename enable_if<
290 __dependent_type<is_default_constructible<_T1>, _Dummy>::value &&
291 __dependent_type<is_default_constructible<_T2>, _Dummy>::value
292 >::type>
293#endif
294 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {}
295
296 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
297 pair(const _T1& __x, const _T2& __y)
298 : first(__x), second(__y) {}
299
300 template<class _U1, class _U2>
301 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
302 pair(const pair<_U1, _U2>& __p
303#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
304 ,typename enable_if<is_convertible<const _U1&, _T1>::value &&
305 is_convertible<const _U2&, _T2>::value>::type* = 0
306#endif
307 )
308 : first(__p.first), second(__p.second) {}
309
310#if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
311 _LIBCPP_INLINE_VISIBILITY
312 pair(const pair& __p)
313 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
314 is_nothrow_copy_constructible<second_type>::value)
315 : first(__p.first),
316 second(__p.second)
317 {
318 }
319
320# ifndef _LIBCPP_CXX03_LANG
321 _LIBCPP_INLINE_VISIBILITY
322 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
323 is_nothrow_move_constructible<second_type>::value)
324 : first(_VSTD::forward<first_type>(__p.first)),
325 second(_VSTD::forward<second_type>(__p.second))
326 {
327 }
328# endif
329#elif !defined(_LIBCPP_CXX03_LANG)
330 pair(pair const&) = default;
331 pair(pair&&) = default;
332#else
333 // Use the implicitly declared copy constructor in C++03
334#endif
335
336 _LIBCPP_INLINE_VISIBILITY
337 pair& operator=(const pair& __p)
338 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
339 is_nothrow_copy_assignable<second_type>::value)
340 {
341 first = __p.first;
342 second = __p.second;
343 return *this;
344 }
345
346#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
347
348 template <class _U1, class _U2,
349 class = typename enable_if<is_convertible<_U1, first_type>::value &&
350 is_convertible<_U2, second_type>::value>::type>
351 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
352 pair(_U1&& __u1, _U2&& __u2)
353 : first(_VSTD::forward<_U1>(__u1)),
354 second(_VSTD::forward<_U2>(__u2))
355 {}
356
357 template<class _U1, class _U2>
358 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
359 pair(pair<_U1, _U2>&& __p,
360 typename enable_if<is_convertible<_U1, _T1>::value &&
361 is_convertible<_U2, _T2>::value>::type* = 0)
362 : first(_VSTD::forward<_U1>(__p.first)),
363 second(_VSTD::forward<_U2>(__p.second)) {}
364
365 _LIBCPP_INLINE_VISIBILITY
366 pair&
367 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
368 is_nothrow_move_assignable<second_type>::value)
369 {
370 first = _VSTD::forward<first_type>(__p.first);
371 second = _VSTD::forward<second_type>(__p.second);
372 return *this;
373 }
374
375#ifndef _LIBCPP_HAS_NO_VARIADICS
376
377 template<class _Tuple,
378 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
379 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
380 pair(_Tuple&& __p)
381 : first(_VSTD::forward<typename tuple_element<0,
382 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<0>(__p))),
383 second(_VSTD::forward<typename tuple_element<1,
384 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<1>(__p)))
385 {}
386
387
388
389 template <class... _Args1, class... _Args2>
390 _LIBCPP_INLINE_VISIBILITY
391 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
392 tuple<_Args2...> __second_args)
393 : pair(__pc, __first_args, __second_args,
394 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
395 typename __make_tuple_indices<sizeof...(_Args2) >::type())
396 {}
397
398 template <class _Tuple,
399 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
400 _LIBCPP_INLINE_VISIBILITY
401 pair&
402 operator=(_Tuple&& __p)
403 {
404 typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
405 typedef typename tuple_element<0, _TupleRef>::type _U0;
406 typedef typename tuple_element<1, _TupleRef>::type _U1;
407 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p));
408 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p));
409 return *this;
410 }
411
412#endif // _LIBCPP_HAS_NO_VARIADICS
413
414#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
415 _LIBCPP_INLINE_VISIBILITY
416 void
417 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
418 __is_nothrow_swappable<second_type>::value)
419 {
420 using _VSTD::swap;
421 swap(first, __p.first);
422 swap(second, __p.second);
423 }
424private:
425
426#ifndef _LIBCPP_HAS_NO_VARIADICS
427 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
428 _LIBCPP_INLINE_VISIBILITY
429 pair(piecewise_construct_t,
430 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
431 __tuple_indices<_I1...>, __tuple_indices<_I2...>);
432#endif // _LIBCPP_HAS_NO_VARIADICS
433};
434
435template <class _T1, class _T2>
436inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
437bool
438operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
439{
440 return __x.first == __y.first && __x.second == __y.second;
441}
442
443template <class _T1, class _T2>
444inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
445bool
446operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
447{
448 return !(__x == __y);
449}
450
451template <class _T1, class _T2>
452inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
453bool
454operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
455{
456 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
457}
458
459template <class _T1, class _T2>
460inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
461bool
462operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
463{
464 return __y < __x;
465}
466
467template <class _T1, class _T2>
468inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
469bool
470operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
471{
472 return !(__x < __y);
473}
474
475template <class _T1, class _T2>
476inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
477bool
478operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
479{
480 return !(__y < __x);
481}
482
483template <class _T1, class _T2>
484inline _LIBCPP_INLINE_VISIBILITY
485typename enable_if
486<
487 __is_swappable<_T1>::value &&
488 __is_swappable<_T2>::value,
489 void
490>::type
491swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
492 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
493 __is_nothrow_swappable<_T2>::value))
494{
495 __x.swap(__y);
496}
497
498#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
499
500
501template <class _Tp>
502struct __make_pair_return_impl
503{
504 typedef _Tp type;
505};
506
507template <class _Tp>
508struct __make_pair_return_impl<reference_wrapper<_Tp>>
509{
510 typedef _Tp& type;
511};
512
513template <class _Tp>
514struct __make_pair_return
515{
516 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type;
517};
518
519template <class _T1, class _T2>
520inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
521pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
522make_pair(_T1&& __t1, _T2&& __t2)
523{
524 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
525 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
526}
527
528#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
529
530template <class _T1, class _T2>
531inline _LIBCPP_INLINE_VISIBILITY
532pair<_T1,_T2>
533make_pair(_T1 __x, _T2 __y)
534{
535 return pair<_T1, _T2>(__x, __y);
536}
537
538#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
539
540template <class _T1, class _T2>
541 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> >
542 : public integral_constant<size_t, 2> {};
543
544template <class _T1, class _T2>
545class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> >
546{
547public:
548 typedef _T1 type;
549};
550
551template <class _T1, class _T2>
552class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> >
553{
554public:
555 typedef _T2 type;
556};
557
558template <size_t _Ip> struct __get_pair;
559
560template <>
561struct __get_pair<0>
562{
563 template <class _T1, class _T2>
564 static
565 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
566 _T1&
567 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
568
569 template <class _T1, class _T2>
570 static
571 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
572 const _T1&
573 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
574
575#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
576
577 template <class _T1, class _T2>
578 static
579 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
580 _T1&&
581 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
582
583 template <class _T1, class _T2>
584 static
585 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
586 const _T1&&
587 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);}
588
589#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
590};
591
592template <>
593struct __get_pair<1>
594{
595 template <class _T1, class _T2>
596 static
597 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
598 _T2&
599 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
600
601 template <class _T1, class _T2>
602 static
603 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
604 const _T2&
605 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
606
607#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
608
609 template <class _T1, class _T2>
610 static
611 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
612 _T2&&
613 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
614
615 template <class _T1, class _T2>
616 static
617 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
618 const _T2&&
619 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);}
620
621#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
622};
623
624template <size_t _Ip, class _T1, class _T2>
625inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
626typename tuple_element<_Ip, pair<_T1, _T2> >::type&
627get(pair<_T1, _T2>& __p) _NOEXCEPT
628{
629 return __get_pair<_Ip>::get(__p);
630}
631
632template <size_t _Ip, class _T1, class _T2>
633inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
634const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
635get(const pair<_T1, _T2>& __p) _NOEXCEPT
636{
637 return __get_pair<_Ip>::get(__p);
638}
639
640#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
641
642template <size_t _Ip, class _T1, class _T2>
643inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
644typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
645get(pair<_T1, _T2>&& __p) _NOEXCEPT
646{
647 return __get_pair<_Ip>::get(_VSTD::move(__p));
648}
649
650template <size_t _Ip, class _T1, class _T2>
651inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
652const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
653get(const pair<_T1, _T2>&& __p) _NOEXCEPT
654{
655 return __get_pair<_Ip>::get(_VSTD::move(__p));
656}
657
658#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
659
660#if _LIBCPP_STD_VER > 11
661template <class _T1, class _T2>
662inline _LIBCPP_INLINE_VISIBILITY
663constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
664{
665 return __get_pair<0>::get(__p);
666}
667
668template <class _T1, class _T2>
669inline _LIBCPP_INLINE_VISIBILITY
670constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
671{
672 return __get_pair<0>::get(__p);
673}
674
675template <class _T1, class _T2>
676inline _LIBCPP_INLINE_VISIBILITY
677constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
678{
679 return __get_pair<0>::get(_VSTD::move(__p));
680}
681
682template <class _T1, class _T2>
683inline _LIBCPP_INLINE_VISIBILITY
684constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT
685{
686 return __get_pair<0>::get(_VSTD::move(__p));
687}
688
689template <class _T1, class _T2>
690inline _LIBCPP_INLINE_VISIBILITY
691constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
692{
693 return __get_pair<1>::get(__p);
694}
695
696template <class _T1, class _T2>
697inline _LIBCPP_INLINE_VISIBILITY
698constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
699{
700 return __get_pair<1>::get(__p);
701}
702
703template <class _T1, class _T2>
704inline _LIBCPP_INLINE_VISIBILITY
705constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
706{
707 return __get_pair<1>::get(_VSTD::move(__p));
708}
709
710template <class _T1, class _T2>
711inline _LIBCPP_INLINE_VISIBILITY
712constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT
713{
714 return __get_pair<1>::get(_VSTD::move(__p));
715}
716
717#endif
718
719#if _LIBCPP_STD_VER > 11
720
721template<class _Tp, _Tp... _Ip>
722struct _LIBCPP_TYPE_VIS_ONLY integer_sequence
723{
724 typedef _Tp value_type;
725 static_assert( is_integral<_Tp>::value,
726 "std::integer_sequence can only be instantiated with an integral type" );
727 static
728 _LIBCPP_INLINE_VISIBILITY
729 constexpr
730 size_t
731 size() noexcept { return sizeof...(_Ip); }
732};
733
734template<size_t... _Ip>
735 using index_sequence = integer_sequence<size_t, _Ip...>;
736
737#if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
738
739template <class _Tp, _Tp _Ep>
740using __make_integer_sequence = __make_integer_seq<integer_sequence, _Tp, _Ep>;
741
742#else
743
744template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
745 typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>;
746
747template <class _Tp, _Tp _Ep>
748struct __make_integer_sequence_checked
749{
750 static_assert(is_integral<_Tp>::value,
751 "std::make_integer_sequence can only be instantiated with an integral type" );
752 static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length");
753 // Workaround GCC bug by preventing bad installations when 0 <= _Ep
754 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929
755 typedef __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
756};
757
758template <class _Tp, _Tp _Ep>
759using __make_integer_sequence = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
760
761#endif
762
763template<class _Tp, _Tp _Np>
764 using make_integer_sequence = __make_integer_sequence<_Tp, _Np>;
765
766template<size_t _Np>
767 using make_index_sequence = make_integer_sequence<size_t, _Np>;
768
769template<class... _Tp>
770 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
771
772#endif // _LIBCPP_STD_VER > 11
773
774#if _LIBCPP_STD_VER > 11
775template<class _T1, class _T2 = _T1>
776inline _LIBCPP_INLINE_VISIBILITY
777_T1 exchange(_T1& __obj, _T2 && __new_value)
778{
779 _T1 __old_value = _VSTD::move(__obj);
780 __obj = _VSTD::forward<_T2>(__new_value);
781 return __old_value;
782}
783#endif // _LIBCPP_STD_VER > 11
784
785_LIBCPP_END_NAMESPACE_STD
786
787#endif // _LIBCPP_UTILITY
788