2 //===-------------------------- utility -----------------------------------===//
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
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_UTILITY
11 #define _LIBCPP_UTILITY
16 #include <initializer_list>
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 template<class T> bool operator>=(const T&, const T&);
35 swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value &&
36 is_nothrow_move_assignable<T>::value);
38 template <class T, size_t N>
40 swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));
42 template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14
43 template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14
45 template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14
50 !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
54 move_if_noexcept(T& x) noexcept; // constexpr in C++14
56 template <class T> constexpr add_const_t<T>& as_const(T& t) noexcept; // C++17
57 template <class T> void as_const(const T&&) = delete; // C++17
59 template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
61 template <class T1, class T2>
64 typedef T1 first_type;
65 typedef T2 second_type;
70 pair(const pair&) = default;
71 pair(pair&&) = default;
72 explicit(see-below) constexpr pair();
73 explicit(see-below) pair(const T1& x, const T2& y); // constexpr in C++14
74 template <class U, class V> explicit(see-below) pair(U&& x, V&& y); // constexpr in C++14
75 template <class U, class V> explicit(see-below) pair(const pair<U, V>& p); // constexpr in C++14
76 template <class U, class V> explicit(see-below) pair(pair<U, V>&& p); // constexpr in C++14
77 template <class... Args1, class... Args2>
78 pair(piecewise_construct_t, tuple<Args1...> first_args,
79 tuple<Args2...> second_args);
81 template <class U, class V> pair& operator=(const pair<U, V>& p);
82 pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value &&
83 is_nothrow_move_assignable<T2>::value);
84 template <class U, class V> pair& operator=(pair<U, V>&& p);
86 void swap(pair& p) noexcept(is_nothrow_swappable_v<T1> &&
87 is_nothrow_swappable_v<T2>);
90 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
91 template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
92 template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
93 template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
94 template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
95 template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
97 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14
98 template <class T1, class T2>
100 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
102 struct piecewise_construct_t { explicit piecewise_construct_t() = default; };
103 inline constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
105 template <class T> struct tuple_size;
106 template <size_t I, class T> struct tuple_element;
108 template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
109 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >;
110 template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >;
112 template<size_t I, class T1, class T2>
113 typename tuple_element<I, pair<T1, T2> >::type&
114 get(pair<T1, T2>&) noexcept; // constexpr in C++14
116 template<size_t I, class T1, class T2>
117 const typename tuple_element<I, pair<T1, T2> >::type&
118 get(const pair<T1, T2>&) noexcept; // constexpr in C++14
120 template<size_t I, class T1, class T2>
121 typename tuple_element<I, pair<T1, T2> >::type&&
122 get(pair<T1, T2>&&) noexcept; // constexpr in C++14
124 template<size_t I, class T1, class T2>
125 const typename tuple_element<I, pair<T1, T2> >::type&&
126 get(const pair<T1, T2>&&) noexcept; // constexpr in C++14
128 template<class T1, class T2>
129 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
131 template<class T1, class T2>
132 constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14
134 template<class T1, class T2>
135 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14
137 template<class T1, class T2>
138 constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14
140 template<class T1, class T2>
141 constexpr T1& get(pair<T2, T1>&) noexcept; // C++14
143 template<class T1, class T2>
144 constexpr const T1& get(const pair<T2, T1>&) noexcept; // C++14
146 template<class T1, class T2>
147 constexpr T1&& get(pair<T2, T1>&&) noexcept; // C++14
149 template<class T1, class T2>
150 constexpr const T1&& get(const pair<T2, T1>&&) noexcept; // C++14
154 template<class T, T... I>
155 struct integer_sequence
157 typedef T value_type;
159 static constexpr size_t size() noexcept;
162 template<size_t... I>
163 using index_sequence = integer_sequence<size_t, I...>;
165 template<class T, T N>
166 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
168 using make_index_sequence = make_integer_sequence<size_t, N>;
171 using index_sequence_for = make_index_sequence<sizeof...(T)>;
173 template<class T, class U=T>
174 T exchange(T& obj, U&& new_value);
176 // 20.2.7, in-place construction // C++17
178 explicit in_place_t() = default;
180 inline constexpr in_place_t in_place{};
182 struct in_place_type_t {
183 explicit in_place_type_t() = default;
186 inline constexpr in_place_type_t<T> in_place_type{};
188 struct in_place_index_t {
189 explicit in_place_index_t() = default;
192 inline constexpr in_place_index_t<I> in_place_index{};
200 #include <type_traits>
201 #include <initializer_list>
208 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
209 #pragma GCC system_header
212 _LIBCPP_BEGIN_NAMESPACE_STD
218 inline _LIBCPP_INLINE_VISIBILITY
220 operator!=(const _Tp& __x, const _Tp& __y)
222 return !(__x == __y);
226 inline _LIBCPP_INLINE_VISIBILITY
228 operator> (const _Tp& __x, const _Tp& __y)
234 inline _LIBCPP_INLINE_VISIBILITY
236 operator<=(const _Tp& __x, const _Tp& __y)
242 inline _LIBCPP_INLINE_VISIBILITY
244 operator>=(const _Tp& __x, const _Tp& __y)
251 // swap_ranges is defined in <type_traits>`
253 // swap is defined in <type_traits>
258 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
259 #ifndef _LIBCPP_CXX03_LANG
262 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
266 #else // _LIBCPP_CXX03_LANG
269 move_if_noexcept(_Tp& __x) _NOEXCEPT
271 return _VSTD::move(__x);
274 #if _LIBCPP_STD_VER > 14
275 template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
276 template <class _Tp> void as_const(const _Tp&&) = delete;
279 struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t { explicit piecewise_construct_t() = default; };
280 #if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
281 extern _LIBCPP_EXPORTED_FROM_ABI const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
283 /* _LIBCPP_INLINE_VAR */ constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
286 #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
287 template <class, class>
288 struct __non_trivially_copyable_base {
289 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
290 __non_trivially_copyable_base() _NOEXCEPT {}
291 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
292 __non_trivially_copyable_base(__non_trivially_copyable_base const&) _NOEXCEPT {}
296 template <class _T1, class _T2>
297 struct _LIBCPP_TEMPLATE_VIS pair
298 #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
299 : private __non_trivially_copyable_base<_T1, _T2>
302 typedef _T1 first_type;
303 typedef _T2 second_type;
308 #if !defined(_LIBCPP_CXX03_LANG)
309 pair(pair const&) = default;
310 pair(pair&&) = default;
312 // Use the implicitly declared copy constructor in C++03
315 #ifdef _LIBCPP_CXX03_LANG
316 _LIBCPP_INLINE_VISIBILITY
317 pair() : first(), second() {}
319 _LIBCPP_INLINE_VISIBILITY
320 pair(_T1 const& __t1, _T2 const& __t2) : first(__t1), second(__t2) {}
322 template <class _U1, class _U2>
323 _LIBCPP_INLINE_VISIBILITY
324 pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {}
326 _LIBCPP_INLINE_VISIBILITY
327 pair& operator=(pair const& __p) {
334 using _EnableB _LIBCPP_NODEBUG_TYPE = typename enable_if<_Val, bool>::type;
338 static constexpr bool __enable_explicit_default() {
339 return is_default_constructible<_T1>::value
340 && is_default_constructible<_T2>::value
341 && !__enable_implicit_default<>();
345 static constexpr bool __enable_implicit_default() {
346 return __is_implicitly_default_constructible<_T1>::value
347 && __is_implicitly_default_constructible<_T2>::value;
350 template <class _U1, class _U2>
351 static constexpr bool __enable_explicit() {
352 return is_constructible<first_type, _U1>::value
353 && is_constructible<second_type, _U2>::value
354 && (!is_convertible<_U1, first_type>::value
355 || !is_convertible<_U2, second_type>::value);
358 template <class _U1, class _U2>
359 static constexpr bool __enable_implicit() {
360 return is_constructible<first_type, _U1>::value
361 && is_constructible<second_type, _U2>::value
362 && is_convertible<_U1, first_type>::value
363 && is_convertible<_U2, second_type>::value;
367 template <bool _MaybeEnable>
368 using _CheckArgsDep _LIBCPP_NODEBUG_TYPE = typename conditional<
369 _MaybeEnable, _CheckArgs, __check_tuple_constructor_fail>::type;
371 struct _CheckTupleLikeConstructor {
372 template <class _Tuple>
373 static constexpr bool __enable_implicit() {
374 return __tuple_convertible<_Tuple, pair>::value;
377 template <class _Tuple>
378 static constexpr bool __enable_explicit() {
379 return __tuple_constructible<_Tuple, pair>::value
380 && !__tuple_convertible<_Tuple, pair>::value;
383 template <class _Tuple>
384 static constexpr bool __enable_assign() {
385 return __tuple_assignable<_Tuple, pair>::value;
389 template <class _Tuple>
390 using _CheckTLC _LIBCPP_NODEBUG_TYPE = typename conditional<
391 __tuple_like_with_size<_Tuple, 2>::value
392 && !is_same<typename decay<_Tuple>::type, pair>::value,
393 _CheckTupleLikeConstructor,
394 __check_tuple_constructor_fail
397 template<bool _Dummy = true, _EnableB<
398 _CheckArgsDep<_Dummy>::__enable_explicit_default()
400 explicit _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
401 pair() _NOEXCEPT_(is_nothrow_default_constructible<first_type>::value &&
402 is_nothrow_default_constructible<second_type>::value)
403 : first(), second() {}
405 template<bool _Dummy = true, _EnableB<
406 _CheckArgsDep<_Dummy>::__enable_implicit_default()
408 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
409 pair() _NOEXCEPT_(is_nothrow_default_constructible<first_type>::value &&
410 is_nothrow_default_constructible<second_type>::value)
411 : first(), second() {}
413 template <bool _Dummy = true, _EnableB<
414 _CheckArgsDep<_Dummy>::template __enable_explicit<_T1 const&, _T2 const&>()
416 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
417 explicit pair(_T1 const& __t1, _T2 const& __t2)
418 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
419 is_nothrow_copy_constructible<second_type>::value)
420 : first(__t1), second(__t2) {}
422 template<bool _Dummy = true, _EnableB<
423 _CheckArgsDep<_Dummy>::template __enable_implicit<_T1 const&, _T2 const&>()
425 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
426 pair(_T1 const& __t1, _T2 const& __t2)
427 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
428 is_nothrow_copy_constructible<second_type>::value)
429 : first(__t1), second(__t2) {}
431 template<class _U1, class _U2, _EnableB<
432 _CheckArgs::template __enable_explicit<_U1, _U2>()
434 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
435 explicit pair(_U1&& __u1, _U2&& __u2)
436 _NOEXCEPT_((is_nothrow_constructible<first_type, _U1>::value &&
437 is_nothrow_constructible<second_type, _U2>::value))
438 : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {}
440 template<class _U1, class _U2, _EnableB<
441 _CheckArgs::template __enable_implicit<_U1, _U2>()
443 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
444 pair(_U1&& __u1, _U2&& __u2)
445 _NOEXCEPT_((is_nothrow_constructible<first_type, _U1>::value &&
446 is_nothrow_constructible<second_type, _U2>::value))
447 : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {}
449 template<class _U1, class _U2, _EnableB<
450 _CheckArgs::template __enable_explicit<_U1 const&, _U2 const&>()
452 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
453 explicit pair(pair<_U1, _U2> const& __p)
454 _NOEXCEPT_((is_nothrow_constructible<first_type, _U1 const&>::value &&
455 is_nothrow_constructible<second_type, _U2 const&>::value))
456 : first(__p.first), second(__p.second) {}
458 template<class _U1, class _U2, _EnableB<
459 _CheckArgs::template __enable_implicit<_U1 const&, _U2 const&>()
461 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
462 pair(pair<_U1, _U2> const& __p)
463 _NOEXCEPT_((is_nothrow_constructible<first_type, _U1 const&>::value &&
464 is_nothrow_constructible<second_type, _U2 const&>::value))
465 : first(__p.first), second(__p.second) {}
467 template<class _U1, class _U2, _EnableB<
468 _CheckArgs::template __enable_explicit<_U1, _U2>()
470 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
471 explicit pair(pair<_U1, _U2>&&__p)
472 _NOEXCEPT_((is_nothrow_constructible<first_type, _U1&&>::value &&
473 is_nothrow_constructible<second_type, _U2&&>::value))
474 : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {}
476 template<class _U1, class _U2, _EnableB<
477 _CheckArgs::template __enable_implicit<_U1, _U2>()
479 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
480 pair(pair<_U1, _U2>&& __p)
481 _NOEXCEPT_((is_nothrow_constructible<first_type, _U1&&>::value &&
482 is_nothrow_constructible<second_type, _U2&&>::value))
483 : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {}
485 template<class _Tuple, _EnableB<
486 _CheckTLC<_Tuple>::template __enable_explicit<_Tuple>()
488 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
489 explicit pair(_Tuple&& __p)
490 : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))),
491 second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {}
493 template<class _Tuple, _EnableB<
494 _CheckTLC<_Tuple>::template __enable_implicit<_Tuple>()
496 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
498 : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))),
499 second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {}
501 template <class... _Args1, class... _Args2>
502 _LIBCPP_INLINE_VISIBILITY
503 pair(piecewise_construct_t __pc,
504 tuple<_Args1...> __first_args, tuple<_Args2...> __second_args)
505 _NOEXCEPT_((is_nothrow_constructible<first_type, _Args1...>::value &&
506 is_nothrow_constructible<second_type, _Args2...>::value))
507 : pair(__pc, __first_args, __second_args,
508 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
509 typename __make_tuple_indices<sizeof...(_Args2) >::type()) {}
511 _LIBCPP_INLINE_VISIBILITY
512 pair& operator=(typename conditional<
513 is_copy_assignable<first_type>::value &&
514 is_copy_assignable<second_type>::value,
515 pair, __nat>::type const& __p)
516 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
517 is_nothrow_copy_assignable<second_type>::value)
524 _LIBCPP_INLINE_VISIBILITY
525 pair& operator=(typename conditional<
526 is_move_assignable<first_type>::value &&
527 is_move_assignable<second_type>::value,
528 pair, __nat>::type&& __p)
529 _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
530 is_nothrow_move_assignable<second_type>::value)
532 first = _VSTD::forward<first_type>(__p.first);
533 second = _VSTD::forward<second_type>(__p.second);
537 template <class _Tuple, _EnableB<
538 _CheckTLC<_Tuple>::template __enable_assign<_Tuple>()
540 _LIBCPP_INLINE_VISIBILITY
541 pair& operator=(_Tuple&& __p) {
542 first = _VSTD::get<0>(_VSTD::forward<_Tuple>(__p));
543 second = _VSTD::get<1>(_VSTD::forward<_Tuple>(__p));
548 _LIBCPP_INLINE_VISIBILITY
550 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
551 __is_nothrow_swappable<second_type>::value)
554 swap(first, __p.first);
555 swap(second, __p.second);
559 #ifndef _LIBCPP_CXX03_LANG
560 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
561 _LIBCPP_INLINE_VISIBILITY
562 pair(piecewise_construct_t,
563 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
564 __tuple_indices<_I1...>, __tuple_indices<_I2...>);
568 #ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
569 template<class _T1, class _T2>
570 pair(_T1, _T2) -> pair<_T1, _T2>;
571 #endif // _LIBCPP_HAS_NO_DEDUCTION_GUIDES
573 template <class _T1, class _T2>
574 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
576 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
578 return __x.first == __y.first && __x.second == __y.second;
581 template <class _T1, class _T2>
582 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
584 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
586 return !(__x == __y);
589 template <class _T1, class _T2>
590 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
592 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
594 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
597 template <class _T1, class _T2>
598 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
600 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
605 template <class _T1, class _T2>
606 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
608 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
613 template <class _T1, class _T2>
614 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
616 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
621 template <class _T1, class _T2>
622 inline _LIBCPP_INLINE_VISIBILITY
625 __is_swappable<_T1>::value &&
626 __is_swappable<_T2>::value,
629 swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
630 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
631 __is_nothrow_swappable<_T2>::value))
637 struct __unwrap_reference { typedef _LIBCPP_NODEBUG_TYPE _Tp type; };
640 struct __unwrap_reference<reference_wrapper<_Tp> > { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; };
642 #if _LIBCPP_STD_VER > 17
644 struct unwrap_reference : __unwrap_reference<_Tp> { };
647 struct unwrap_ref_decay : unwrap_reference<typename decay<_Tp>::type> { };
651 struct __unwrap_ref_decay
652 #if _LIBCPP_STD_VER > 17
653 : unwrap_ref_decay<_Tp>
655 : __unwrap_reference<typename decay<_Tp>::type>
659 #ifndef _LIBCPP_CXX03_LANG
661 template <class _T1, class _T2>
662 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
663 pair<typename __unwrap_ref_decay<_T1>::type, typename __unwrap_ref_decay<_T2>::type>
664 make_pair(_T1&& __t1, _T2&& __t2)
666 return pair<typename __unwrap_ref_decay<_T1>::type, typename __unwrap_ref_decay<_T2>::type>
667 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
670 #else // _LIBCPP_CXX03_LANG
672 template <class _T1, class _T2>
673 inline _LIBCPP_INLINE_VISIBILITY
675 make_pair(_T1 __x, _T2 __y)
677 return pair<_T1, _T2>(__x, __y);
680 #endif // _LIBCPP_CXX03_LANG
682 template <class _T1, class _T2>
683 struct _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> >
684 : public integral_constant<size_t, 2> {};
686 template <size_t _Ip, class _T1, class _T2>
687 struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, pair<_T1, _T2> >
689 static_assert(_Ip < 2, "Index out of bounds in std::tuple_element<std::pair<T1, T2>>");
692 template <class _T1, class _T2>
693 struct _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
695 typedef _LIBCPP_NODEBUG_TYPE _T1 type;
698 template <class _T1, class _T2>
699 struct _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> >
701 typedef _LIBCPP_NODEBUG_TYPE _T2 type;
704 template <size_t _Ip> struct __get_pair;
709 template <class _T1, class _T2>
711 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
713 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
715 template <class _T1, class _T2>
717 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
719 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
721 #ifndef _LIBCPP_CXX03_LANG
722 template <class _T1, class _T2>
724 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
726 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
728 template <class _T1, class _T2>
730 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
732 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);}
733 #endif // _LIBCPP_CXX03_LANG
739 template <class _T1, class _T2>
741 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
743 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
745 template <class _T1, class _T2>
747 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
749 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
751 #ifndef _LIBCPP_CXX03_LANG
752 template <class _T1, class _T2>
754 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
756 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
758 template <class _T1, class _T2>
760 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
762 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);}
763 #endif // _LIBCPP_CXX03_LANG
766 template <size_t _Ip, class _T1, class _T2>
767 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
768 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
769 get(pair<_T1, _T2>& __p) _NOEXCEPT
771 return __get_pair<_Ip>::get(__p);
774 template <size_t _Ip, class _T1, class _T2>
775 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
776 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
777 get(const pair<_T1, _T2>& __p) _NOEXCEPT
779 return __get_pair<_Ip>::get(__p);
782 #ifndef _LIBCPP_CXX03_LANG
783 template <size_t _Ip, class _T1, class _T2>
784 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
785 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
786 get(pair<_T1, _T2>&& __p) _NOEXCEPT
788 return __get_pair<_Ip>::get(_VSTD::move(__p));
791 template <size_t _Ip, class _T1, class _T2>
792 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
793 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
794 get(const pair<_T1, _T2>&& __p) _NOEXCEPT
796 return __get_pair<_Ip>::get(_VSTD::move(__p));
798 #endif // _LIBCPP_CXX03_LANG
800 #if _LIBCPP_STD_VER > 11
801 template <class _T1, class _T2>
802 inline _LIBCPP_INLINE_VISIBILITY
803 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
805 return __get_pair<0>::get(__p);
808 template <class _T1, class _T2>
809 inline _LIBCPP_INLINE_VISIBILITY
810 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
812 return __get_pair<0>::get(__p);
815 template <class _T1, class _T2>
816 inline _LIBCPP_INLINE_VISIBILITY
817 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
819 return __get_pair<0>::get(_VSTD::move(__p));
822 template <class _T1, class _T2>
823 inline _LIBCPP_INLINE_VISIBILITY
824 constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT
826 return __get_pair<0>::get(_VSTD::move(__p));
829 template <class _T1, class _T2>
830 inline _LIBCPP_INLINE_VISIBILITY
831 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
833 return __get_pair<1>::get(__p);
836 template <class _T1, class _T2>
837 inline _LIBCPP_INLINE_VISIBILITY
838 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
840 return __get_pair<1>::get(__p);
843 template <class _T1, class _T2>
844 inline _LIBCPP_INLINE_VISIBILITY
845 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
847 return __get_pair<1>::get(_VSTD::move(__p));
850 template <class _T1, class _T2>
851 inline _LIBCPP_INLINE_VISIBILITY
852 constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT
854 return __get_pair<1>::get(_VSTD::move(__p));
859 #if _LIBCPP_STD_VER > 11
861 template<class _Tp, _Tp... _Ip>
862 struct _LIBCPP_TEMPLATE_VIS integer_sequence
864 typedef _Tp value_type;
865 static_assert( is_integral<_Tp>::value,
866 "std::integer_sequence can only be instantiated with an integral type" );
868 _LIBCPP_INLINE_VISIBILITY
871 size() noexcept { return sizeof...(_Ip); }
874 template<size_t... _Ip>
875 using index_sequence = integer_sequence<size_t, _Ip...>;
877 #if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
879 template <class _Tp, _Tp _Ep>
880 using __make_integer_sequence _LIBCPP_NODEBUG_TYPE = __make_integer_seq<integer_sequence, _Tp, _Ep>;
884 template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked _LIBCPP_NODEBUG_TYPE =
885 typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>;
887 template <class _Tp, _Tp _Ep>
888 struct __make_integer_sequence_checked
890 static_assert(is_integral<_Tp>::value,
891 "std::make_integer_sequence can only be instantiated with an integral type" );
892 static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length");
893 // Workaround GCC bug by preventing bad installations when 0 <= _Ep
894 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929
895 typedef _LIBCPP_NODEBUG_TYPE __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
898 template <class _Tp, _Tp _Ep>
899 using __make_integer_sequence _LIBCPP_NODEBUG_TYPE = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
903 template<class _Tp, _Tp _Np>
904 using make_integer_sequence = __make_integer_sequence<_Tp, _Np>;
907 using make_index_sequence = make_integer_sequence<size_t, _Np>;
909 template<class... _Tp>
910 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
912 #endif // _LIBCPP_STD_VER > 11
914 #if _LIBCPP_STD_VER > 11
915 template<class _T1, class _T2 = _T1>
916 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
917 _T1 exchange(_T1& __obj, _T2 && __new_value)
919 _T1 __old_value = _VSTD::move(__obj);
920 __obj = _VSTD::forward<_T2>(__new_value);
923 #endif // _LIBCPP_STD_VER > 11
925 #if _LIBCPP_STD_VER > 14
927 struct _LIBCPP_TYPE_VIS in_place_t {
928 explicit in_place_t() = default;
930 _LIBCPP_INLINE_VAR constexpr in_place_t in_place{};
933 struct _LIBCPP_TEMPLATE_VIS in_place_type_t {
934 explicit in_place_type_t() = default;
937 _LIBCPP_INLINE_VAR constexpr in_place_type_t<_Tp> in_place_type{};
939 template <size_t _Idx>
940 struct _LIBCPP_TYPE_VIS in_place_index_t {
941 explicit in_place_index_t() = default;
943 template <size_t _Idx>
944 _LIBCPP_INLINE_VAR constexpr in_place_index_t<_Idx> in_place_index{};
946 template <class _Tp> struct __is_inplace_type_imp : false_type {};
947 template <class _Tp> struct __is_inplace_type_imp<in_place_type_t<_Tp>> : true_type {};
950 using __is_inplace_type = __is_inplace_type_imp<__uncvref_t<_Tp>>;
952 template <class _Tp> struct __is_inplace_index_imp : false_type {};
953 template <size_t _Idx> struct __is_inplace_index_imp<in_place_index_t<_Idx>> : true_type {};
956 using __is_inplace_index = __is_inplace_index_imp<__uncvref_t<_Tp>>;
958 #endif // _LIBCPP_STD_VER > 14
960 template <class _Arg, class _Result>
961 struct _LIBCPP_TEMPLATE_VIS unary_function
963 typedef _Arg argument_type;
964 typedef _Result result_type;
967 template <class _Size>
968 inline _LIBCPP_INLINE_VISIBILITY
970 __loadword(const void* __p)
973 std::memcpy(&__r, __p, sizeof(__r));
977 // We use murmur2 when size_t is 32 bits, and cityhash64 when size_t
978 // is 64 bits. This is because cityhash64 uses 64bit x 64bit
979 // multiplication, which can be very slow on 32-bit systems.
980 template <class _Size, size_t = sizeof(_Size)*__CHAR_BIT__>
981 struct __murmur2_or_cityhash;
983 template <class _Size>
984 struct __murmur2_or_cityhash<_Size, 32>
986 inline _Size operator()(const void* __key, _Size __len)
987 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
991 template <class _Size>
993 __murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len)
995 const _Size __m = 0x5bd1e995;
996 const _Size __r = 24;
998 const unsigned char* __data = static_cast<const unsigned char*>(__key);
999 for (; __len >= 4; __data += 4, __len -= 4)
1001 _Size __k = __loadword<_Size>(__data);
1011 __h ^= __data[2] << 16;
1012 _LIBCPP_FALLTHROUGH();
1014 __h ^= __data[1] << 8;
1015 _LIBCPP_FALLTHROUGH();
1026 template <class _Size>
1027 struct __murmur2_or_cityhash<_Size, 64>
1029 inline _Size operator()(const void* __key, _Size __len) _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
1032 // Some primes between 2^63 and 2^64.
1033 static const _Size __k0 = 0xc3a5c85c97cb3127ULL;
1034 static const _Size __k1 = 0xb492b66fbe98f273ULL;
1035 static const _Size __k2 = 0x9ae16a3b2f90404fULL;
1036 static const _Size __k3 = 0xc949d7c7509e6557ULL;
1038 static _Size __rotate(_Size __val, int __shift) {
1039 return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift)));
1042 static _Size __rotate_by_at_least_1(_Size __val, int __shift) {
1043 return (__val >> __shift) | (__val << (64 - __shift));
1046 static _Size __shift_mix(_Size __val) {
1047 return __val ^ (__val >> 47);
1050 static _Size __hash_len_16(_Size __u, _Size __v)
1051 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1053 const _Size __mul = 0x9ddfea08eb382d69ULL;
1054 _Size __a = (__u ^ __v) * __mul;
1056 _Size __b = (__v ^ __a) * __mul;
1062 static _Size __hash_len_0_to_16(const char* __s, _Size __len)
1063 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1066 const _Size __a = __loadword<_Size>(__s);
1067 const _Size __b = __loadword<_Size>(__s + __len - 8);
1068 return __hash_len_16(__a, __rotate_by_at_least_1(__b + __len, __len)) ^ __b;
1071 const uint32_t __a = __loadword<uint32_t>(__s);
1072 const uint32_t __b = __loadword<uint32_t>(__s + __len - 4);
1073 return __hash_len_16(__len + (__a << 3), __b);
1076 const unsigned char __a = __s[0];
1077 const unsigned char __b = __s[__len >> 1];
1078 const unsigned char __c = __s[__len - 1];
1079 const uint32_t __y = static_cast<uint32_t>(__a) +
1080 (static_cast<uint32_t>(__b) << 8);
1081 const uint32_t __z = __len + (static_cast<uint32_t>(__c) << 2);
1082 return __shift_mix(__y * __k2 ^ __z * __k3) * __k2;
1087 static _Size __hash_len_17_to_32(const char *__s, _Size __len)
1088 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1090 const _Size __a = __loadword<_Size>(__s) * __k1;
1091 const _Size __b = __loadword<_Size>(__s + 8);
1092 const _Size __c = __loadword<_Size>(__s + __len - 8) * __k2;
1093 const _Size __d = __loadword<_Size>(__s + __len - 16) * __k0;
1094 return __hash_len_16(__rotate(__a - __b, 43) + __rotate(__c, 30) + __d,
1095 __a + __rotate(__b ^ __k3, 20) - __c + __len);
1098 // Return a 16-byte hash for 48 bytes. Quick and dirty.
1099 // Callers do best to use "random-looking" values for a and b.
1100 static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
1101 _Size __w, _Size __x, _Size __y, _Size __z, _Size __a, _Size __b)
1102 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1105 __b = __rotate(__b + __a + __z, 21);
1106 const _Size __c = __a;
1109 __b += __rotate(__a, 44);
1110 return pair<_Size, _Size>(__a + __z, __b + __c);
1113 // Return a 16-byte hash for s[0] ... s[31], a, and b. Quick and dirty.
1114 static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
1115 const char* __s, _Size __a, _Size __b)
1116 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1118 return __weak_hash_len_32_with_seeds(__loadword<_Size>(__s),
1119 __loadword<_Size>(__s + 8),
1120 __loadword<_Size>(__s + 16),
1121 __loadword<_Size>(__s + 24),
1126 // Return an 8-byte hash for 33 to 64 bytes.
1127 static _Size __hash_len_33_to_64(const char *__s, size_t __len)
1128 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1130 _Size __z = __loadword<_Size>(__s + 24);
1131 _Size __a = __loadword<_Size>(__s) +
1132 (__len + __loadword<_Size>(__s + __len - 16)) * __k0;
1133 _Size __b = __rotate(__a + __z, 52);
1134 _Size __c = __rotate(__a, 37);
1135 __a += __loadword<_Size>(__s + 8);
1136 __c += __rotate(__a, 7);
1137 __a += __loadword<_Size>(__s + 16);
1138 _Size __vf = __a + __z;
1139 _Size __vs = __b + __rotate(__a, 31) + __c;
1140 __a = __loadword<_Size>(__s + 16) + __loadword<_Size>(__s + __len - 32);
1141 __z += __loadword<_Size>(__s + __len - 8);
1142 __b = __rotate(__a + __z, 52);
1143 __c = __rotate(__a, 37);
1144 __a += __loadword<_Size>(__s + __len - 24);
1145 __c += __rotate(__a, 7);
1146 __a += __loadword<_Size>(__s + __len - 16);
1147 _Size __wf = __a + __z;
1148 _Size __ws = __b + __rotate(__a, 31) + __c;
1149 _Size __r = __shift_mix((__vf + __ws) * __k2 + (__wf + __vs) * __k0);
1150 return __shift_mix(__r * __k0 + __vs) * __k2;
1155 template <class _Size>
1157 __murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len)
1159 const char* __s = static_cast<const char*>(__key);
1162 return __hash_len_0_to_16(__s, __len);
1164 return __hash_len_17_to_32(__s, __len);
1166 } else if (__len <= 64) {
1167 return __hash_len_33_to_64(__s, __len);
1170 // For strings over 64 bytes we hash the end first, and then as we
1171 // loop we keep 56 bytes of state: v, w, x, y, and z.
1172 _Size __x = __loadword<_Size>(__s + __len - 40);
1173 _Size __y = __loadword<_Size>(__s + __len - 16) +
1174 __loadword<_Size>(__s + __len - 56);
1175 _Size __z = __hash_len_16(__loadword<_Size>(__s + __len - 48) + __len,
1176 __loadword<_Size>(__s + __len - 24));
1177 pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
1178 pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
1179 __x = __x * __k1 + __loadword<_Size>(__s);
1181 // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
1182 __len = (__len - 1) & ~static_cast<_Size>(63);
1184 __x = __rotate(__x + __y + __v.first + __loadword<_Size>(__s + 8), 37) * __k1;
1185 __y = __rotate(__y + __v.second + __loadword<_Size>(__s + 48), 42) * __k1;
1187 __y += __v.first + __loadword<_Size>(__s + 40);
1188 __z = __rotate(__z + __w.first, 33) * __k1;
1189 __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
1190 __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
1191 __y + __loadword<_Size>(__s + 16));
1192 std::swap(__z, __x);
1195 } while (__len != 0);
1196 return __hash_len_16(
1197 __hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z,
1198 __hash_len_16(__v.second, __w.second) + __x);
1201 template <class _Tp, size_t = sizeof(_Tp) / sizeof(size_t)>
1202 struct __scalar_hash;
1204 template <class _Tp>
1205 struct __scalar_hash<_Tp, 0>
1206 : public unary_function<_Tp, size_t>
1208 _LIBCPP_INLINE_VISIBILITY
1209 size_t operator()(_Tp __v) const _NOEXCEPT
1222 template <class _Tp>
1223 struct __scalar_hash<_Tp, 1>
1224 : public unary_function<_Tp, size_t>
1226 _LIBCPP_INLINE_VISIBILITY
1227 size_t operator()(_Tp __v) const _NOEXCEPT
1239 template <class _Tp>
1240 struct __scalar_hash<_Tp, 2>
1241 : public unary_function<_Tp, size_t>
1243 _LIBCPP_INLINE_VISIBILITY
1244 size_t operator()(_Tp __v) const _NOEXCEPT
1256 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1260 template <class _Tp>
1261 struct __scalar_hash<_Tp, 3>
1262 : public unary_function<_Tp, size_t>
1264 _LIBCPP_INLINE_VISIBILITY
1265 size_t operator()(_Tp __v) const _NOEXCEPT
1278 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1282 template <class _Tp>
1283 struct __scalar_hash<_Tp, 4>
1284 : public unary_function<_Tp, size_t>
1286 _LIBCPP_INLINE_VISIBILITY
1287 size_t operator()(_Tp __v) const _NOEXCEPT
1301 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1310 _LIBCPP_INLINE_VISIBILITY
1311 inline size_t __hash_combine(size_t __lhs, size_t __rhs) _NOEXCEPT {
1312 typedef __scalar_hash<_PairT> _HashT;
1313 const _PairT __p = {__lhs, __rhs};
1314 return _HashT()(__p);
1318 struct _LIBCPP_TEMPLATE_VIS hash<_Tp*>
1319 : public unary_function<_Tp*, size_t>
1321 _LIBCPP_INLINE_VISIBILITY
1322 size_t operator()(_Tp* __v) const _NOEXCEPT
1330 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1336 struct _LIBCPP_TEMPLATE_VIS hash<bool>
1337 : public unary_function<bool, size_t>
1339 _LIBCPP_INLINE_VISIBILITY
1340 size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1344 struct _LIBCPP_TEMPLATE_VIS hash<char>
1345 : public unary_function<char, size_t>
1347 _LIBCPP_INLINE_VISIBILITY
1348 size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1352 struct _LIBCPP_TEMPLATE_VIS hash<signed char>
1353 : public unary_function<signed char, size_t>
1355 _LIBCPP_INLINE_VISIBILITY
1356 size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1360 struct _LIBCPP_TEMPLATE_VIS hash<unsigned char>
1361 : public unary_function<unsigned char, size_t>
1363 _LIBCPP_INLINE_VISIBILITY
1364 size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1367 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
1370 struct _LIBCPP_TEMPLATE_VIS hash<char16_t>
1371 : public unary_function<char16_t, size_t>
1373 _LIBCPP_INLINE_VISIBILITY
1374 size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1378 struct _LIBCPP_TEMPLATE_VIS hash<char32_t>
1379 : public unary_function<char32_t, size_t>
1381 _LIBCPP_INLINE_VISIBILITY
1382 size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1385 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS
1388 struct _LIBCPP_TEMPLATE_VIS hash<wchar_t>
1389 : public unary_function<wchar_t, size_t>
1391 _LIBCPP_INLINE_VISIBILITY
1392 size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1396 struct _LIBCPP_TEMPLATE_VIS hash<short>
1397 : public unary_function<short, size_t>
1399 _LIBCPP_INLINE_VISIBILITY
1400 size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1404 struct _LIBCPP_TEMPLATE_VIS hash<unsigned short>
1405 : public unary_function<unsigned short, size_t>
1407 _LIBCPP_INLINE_VISIBILITY
1408 size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1412 struct _LIBCPP_TEMPLATE_VIS hash<int>
1413 : public unary_function<int, size_t>
1415 _LIBCPP_INLINE_VISIBILITY
1416 size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1420 struct _LIBCPP_TEMPLATE_VIS hash<unsigned int>
1421 : public unary_function<unsigned int, size_t>
1423 _LIBCPP_INLINE_VISIBILITY
1424 size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1428 struct _LIBCPP_TEMPLATE_VIS hash<long>
1429 : public unary_function<long, size_t>
1431 _LIBCPP_INLINE_VISIBILITY
1432 size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1436 struct _LIBCPP_TEMPLATE_VIS hash<unsigned long>
1437 : public unary_function<unsigned long, size_t>
1439 _LIBCPP_INLINE_VISIBILITY
1440 size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1444 struct _LIBCPP_TEMPLATE_VIS hash<long long>
1445 : public __scalar_hash<long long>
1450 struct _LIBCPP_TEMPLATE_VIS hash<unsigned long long>
1451 : public __scalar_hash<unsigned long long>
1455 #ifndef _LIBCPP_HAS_NO_INT128
1458 struct _LIBCPP_TEMPLATE_VIS hash<__int128_t>
1459 : public __scalar_hash<__int128_t>
1464 struct _LIBCPP_TEMPLATE_VIS hash<__uint128_t>
1465 : public __scalar_hash<__uint128_t>
1472 struct _LIBCPP_TEMPLATE_VIS hash<float>
1473 : public __scalar_hash<float>
1475 _LIBCPP_INLINE_VISIBILITY
1476 size_t operator()(float __v) const _NOEXCEPT
1478 // -0.0 and 0.0 should return same hash
1481 return __scalar_hash<float>::operator()(__v);
1486 struct _LIBCPP_TEMPLATE_VIS hash<double>
1487 : public __scalar_hash<double>
1489 _LIBCPP_INLINE_VISIBILITY
1490 size_t operator()(double __v) const _NOEXCEPT
1492 // -0.0 and 0.0 should return same hash
1495 return __scalar_hash<double>::operator()(__v);
1500 struct _LIBCPP_TEMPLATE_VIS hash<long double>
1501 : public __scalar_hash<long double>
1503 _LIBCPP_INLINE_VISIBILITY
1504 size_t operator()(long double __v) const _NOEXCEPT
1506 // -0.0 and 0.0 should return same hash
1509 #if defined(__i386__)
1510 // Zero out padding bits
1527 return __u.__s.__a ^ __u.__s.__b ^ __u.__s.__c ^ __u.__s.__d;
1528 #elif defined(__x86_64__)
1529 // Zero out padding bits
1542 return __u.__s.__a ^ __u.__s.__b;
1544 return __scalar_hash<long double>::operator()(__v);
1549 #if _LIBCPP_STD_VER > 11
1551 template <class _Tp, bool = is_enum<_Tp>::value>
1552 struct _LIBCPP_TEMPLATE_VIS __enum_hash
1553 : public unary_function<_Tp, size_t>
1555 _LIBCPP_INLINE_VISIBILITY
1556 size_t operator()(_Tp __v) const _NOEXCEPT
1558 typedef typename underlying_type<_Tp>::type type;
1559 return hash<type>{}(static_cast<type>(__v));
1562 template <class _Tp>
1563 struct _LIBCPP_TEMPLATE_VIS __enum_hash<_Tp, false> {
1564 __enum_hash() = delete;
1565 __enum_hash(__enum_hash const&) = delete;
1566 __enum_hash& operator=(__enum_hash const&) = delete;
1569 template <class _Tp>
1570 struct _LIBCPP_TEMPLATE_VIS hash : public __enum_hash<_Tp>
1575 #if _LIBCPP_STD_VER > 14
1578 struct _LIBCPP_TEMPLATE_VIS hash<nullptr_t>
1579 : public unary_function<nullptr_t, size_t>
1581 _LIBCPP_INLINE_VISIBILITY
1582 size_t operator()(nullptr_t) const _NOEXCEPT {
1583 return 662607004ull;
1588 #ifndef _LIBCPP_CXX03_LANG
1589 template <class _Key, class _Hash>
1590 using __check_hash_requirements _LIBCPP_NODEBUG_TYPE = integral_constant<bool,
1591 is_copy_constructible<_Hash>::value &&
1592 is_move_constructible<_Hash>::value &&
1593 __invokable_r<size_t, _Hash, _Key const&>::value
1596 template <class _Key, class _Hash = std::hash<_Key> >
1597 using __has_enabled_hash _LIBCPP_NODEBUG_TYPE = integral_constant<bool,
1598 __check_hash_requirements<_Key, _Hash>::value &&
1599 is_default_constructible<_Hash>::value
1602 #if _LIBCPP_STD_VER > 14
1603 template <class _Type, class>
1604 using __enable_hash_helper_imp _LIBCPP_NODEBUG_TYPE = _Type;
1606 template <class _Type, class ..._Keys>
1607 using __enable_hash_helper _LIBCPP_NODEBUG_TYPE = __enable_hash_helper_imp<_Type,
1608 typename enable_if<__all<__has_enabled_hash<_Keys>::value...>::value>::type
1611 template <class _Type, class ...>
1612 using __enable_hash_helper _LIBCPP_NODEBUG_TYPE = _Type;
1615 #endif // !_LIBCPP_CXX03_LANG
1617 _LIBCPP_END_NAMESPACE_STD
1619 #endif // _LIBCPP_UTILITY