2 //===-------------------------- utility -----------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_UTILITY
12 #define _LIBCPP_UTILITY
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&);
34 swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value &&
35 is_nothrow_move_assignable<T>::value);
37 template <class T, size_t N>
39 swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));
41 template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14
42 template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14
44 template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14
49 !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
53 move_if_noexcept(T& x) noexcept; // constexpr in C++14
55 template <class T> constexpr add_const<T>_t& as_const(T& t) noexcept; // C++17
56 template <class T> void as_const(const T&&) = delete; // C++17
58 template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
60 template <class T1, class T2>
63 typedef T1 first_type;
64 typedef T2 second_type;
69 pair(const pair&) = default;
70 pair(pair&&) = default;
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);
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);
85 void swap(pair& p) noexcept(is_nothrow_swappable_v<T1> &&
86 is_nothrow_swappable_v<T2>);
89 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
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
96 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14
97 template <class T1, class T2>
99 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
101 struct piecewise_construct_t { };
102 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
104 template <class T> class tuple_size;
105 template <size_t I, class T> class tuple_element;
107 template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
108 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >;
109 template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >;
111 template<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
115 template<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
119 template<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
123 template<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
127 template<class T1, class T2>
128 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
130 template<class T1, class T2>
131 constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14
133 template<class T1, class T2>
134 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14
136 template<class T1, class T2>
137 constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14
139 template<class T1, class T2>
140 constexpr T1& get(pair<T2, T1>&) noexcept; // C++14
142 template<class T1, class T2>
143 constexpr const T1& get(const pair<T2, T1>&) noexcept; // C++14
145 template<class T1, class T2>
146 constexpr T1&& get(pair<T2, T1>&&) noexcept; // C++14
148 template<class T1, class T2>
149 constexpr const T1&& get(const pair<T2, T1>&&) noexcept; // C++14
153 template<class T, T... I>
154 struct integer_sequence
156 typedef T value_type;
158 static constexpr size_t size() noexcept;
161 template<size_t... I>
162 using index_sequence = integer_sequence<size_t, I...>;
164 template<class T, T N>
165 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
167 using make_index_sequence = make_integer_sequence<size_t, N>;
170 using index_sequence_for = make_index_sequence<sizeof...(T)>;
172 template<class T, class U=T>
173 T exchange(T& obj, U&& new_value);
175 // 20.2.7, in-place construction // C++17
177 explicit in_place_t() = default;
179 inline constexpr in_place_t in_place{};
181 struct in_place_type_t {
182 explicit in_place_type_t() = default;
185 inline constexpr in_place_type_t<T> in_place_type{};
187 struct in_place_index_t {
188 explicit in_place_index_t() = default;
191 inline constexpr in_place_index_t<I> in_place_index{};
199 #include <type_traits>
200 #include <initializer_list>
206 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
207 #pragma GCC system_header
210 _LIBCPP_BEGIN_NAMESPACE_STD
216 inline _LIBCPP_INLINE_VISIBILITY
218 operator!=(const _Tp& __x, const _Tp& __y)
220 return !(__x == __y);
224 inline _LIBCPP_INLINE_VISIBILITY
226 operator> (const _Tp& __x, const _Tp& __y)
232 inline _LIBCPP_INLINE_VISIBILITY
234 operator<=(const _Tp& __x, const _Tp& __y)
240 inline _LIBCPP_INLINE_VISIBILITY
242 operator>=(const _Tp& __x, const _Tp& __y)
252 template <class _ForwardIterator1, class _ForwardIterator2>
253 inline _LIBCPP_INLINE_VISIBILITY
255 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
257 for(; __first1 != __last1; ++__first1, (void) ++__first2)
258 swap(*__first1, *__first2);
262 // forward declared in <type_traits>
263 template<class _Tp, size_t _Np>
264 inline _LIBCPP_INLINE_VISIBILITY
266 __is_swappable<_Tp>::value
268 swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
270 _VSTD::swap_ranges(__a, __a + _Np, __b);
274 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
275 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
278 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
282 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
285 move_if_noexcept(_Tp& __x) _NOEXCEPT
287 return _VSTD::move(__x);
290 #if _LIBCPP_STD_VER > 14
291 template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
292 template <class _Tp> void as_const(const _Tp&&) = delete;
295 struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t { };
296 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY)
297 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
299 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
302 #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
303 struct __non_trivially_copyable_base {
304 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
305 __non_trivially_copyable_base() _NOEXCEPT {}
306 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
307 __non_trivially_copyable_base(__non_trivially_copyable_base const&) _NOEXCEPT {}
311 template <class _T1, class _T2>
312 struct _LIBCPP_TEMPLATE_VIS pair
313 #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
314 : private __non_trivially_copyable_base
317 typedef _T1 first_type;
318 typedef _T2 second_type;
323 #if !defined(_LIBCPP_CXX03_LANG)
324 pair(pair const&) = default;
325 pair(pair&&) = default;
327 // Use the implicitly declared copy constructor in C++03
330 #ifdef _LIBCPP_CXX03_LANG
331 _LIBCPP_INLINE_VISIBILITY
332 pair() : first(), second() {}
334 _LIBCPP_INLINE_VISIBILITY
335 pair(_T1 const& __t1, _T2 const& __t2) : first(__t1), second(__t2) {}
337 template <class _U1, class _U2>
338 _LIBCPP_INLINE_VISIBILITY
339 pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {}
341 _LIBCPP_INLINE_VISIBILITY
342 pair& operator=(pair const& __p) {
349 using _EnableB = typename enable_if<_Val, bool>::type;
352 template <class _U1, class _U2>
353 static constexpr bool __enable_default() {
354 return is_default_constructible<_U1>::value
355 && is_default_constructible<_U2>::value;
358 template <class _U1, class _U2>
359 static constexpr bool __enable_explicit() {
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);
366 template <class _U1, class _U2>
367 static constexpr bool __enable_implicit() {
368 return is_constructible<first_type, _U1>::value
369 && is_constructible<second_type, _U2>::value
370 && is_convertible<_U1, first_type>::value
371 && is_convertible<_U2, second_type>::value;
375 template <bool _MaybeEnable>
376 using _CheckArgsDep = typename conditional<
377 _MaybeEnable, _CheckArgs, __check_tuple_constructor_fail>::type;
379 struct _CheckTupleLikeConstructor {
380 template <class _Tuple>
381 static constexpr bool __enable_implicit() {
382 return __tuple_convertible<_Tuple, pair>::value;
385 template <class _Tuple>
386 static constexpr bool __enable_explicit() {
387 return __tuple_constructible<_Tuple, pair>::value
388 && !__tuple_convertible<_Tuple, pair>::value;
391 template <class _Tuple>
392 static constexpr bool __enable_assign() {
393 return __tuple_assignable<_Tuple, pair>::value;
397 template <class _Tuple>
398 using _CheckTLC = typename conditional<
399 __tuple_like_with_size<_Tuple, 2>::value
400 && !is_same<typename decay<_Tuple>::type, pair>::value,
401 _CheckTupleLikeConstructor,
402 __check_tuple_constructor_fail
405 template<bool _Dummy = true, _EnableB<
406 _CheckArgsDep<_Dummy>::template __enable_default<_T1, _T2>()
408 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
409 pair() : first(), second() {}
411 template <bool _Dummy = true, _EnableB<
412 _CheckArgsDep<_Dummy>::template __enable_explicit<_T1 const&, _T2 const&>()
414 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
415 explicit pair(_T1 const& __t1, _T2 const& __t2)
416 : first(__t1), second(__t2) {}
418 template<bool _Dummy = true, _EnableB<
419 _CheckArgsDep<_Dummy>::template __enable_implicit<_T1 const&, _T2 const&>()
421 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
422 pair(_T1 const& __t1, _T2 const& __t2)
423 : first(__t1), second(__t2) {}
425 template<class _U1, class _U2, _EnableB<
426 _CheckArgs::template __enable_explicit<_U1, _U2>()
428 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
429 explicit pair(_U1&& __u1, _U2&& __u2)
430 : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {}
432 template<class _U1, class _U2, _EnableB<
433 _CheckArgs::template __enable_implicit<_U1, _U2>()
435 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
436 pair(_U1&& __u1, _U2&& __u2)
437 : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {}
439 template<class _U1, class _U2, _EnableB<
440 _CheckArgs::template __enable_explicit<_U1 const&, _U2 const&>()
442 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
443 explicit pair(pair<_U1, _U2> const& __p)
444 : first(__p.first), second(__p.second) {}
446 template<class _U1, class _U2, _EnableB<
447 _CheckArgs::template __enable_implicit<_U1 const&, _U2 const&>()
449 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
450 pair(pair<_U1, _U2> const& __p)
451 : first(__p.first), second(__p.second) {}
453 template<class _U1, class _U2, _EnableB<
454 _CheckArgs::template __enable_explicit<_U1, _U2>()
456 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
457 explicit pair(pair<_U1, _U2>&&__p)
458 : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {}
460 template<class _U1, class _U2, _EnableB<
461 _CheckArgs::template __enable_implicit<_U1, _U2>()
463 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
464 pair(pair<_U1, _U2>&& __p)
465 : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {}
467 template<class _Tuple, _EnableB<
468 _CheckTLC<_Tuple>::template __enable_explicit<_Tuple>()
470 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
471 explicit pair(_Tuple&& __p)
472 : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))),
473 second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {}
475 template<class _Tuple, _EnableB<
476 _CheckTLC<_Tuple>::template __enable_implicit<_Tuple>()
478 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
480 : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))),
481 second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {}
483 template <class... _Args1, class... _Args2>
484 _LIBCPP_INLINE_VISIBILITY
485 pair(piecewise_construct_t __pc,
486 tuple<_Args1...> __first_args, tuple<_Args2...> __second_args)
487 : pair(__pc, __first_args, __second_args,
488 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
489 typename __make_tuple_indices<sizeof...(_Args2) >::type()) {}
491 _LIBCPP_INLINE_VISIBILITY
492 pair& operator=(typename conditional<
493 is_copy_assignable<first_type>::value &&
494 is_copy_assignable<second_type>::value,
495 pair, __nat>::type const& __p)
496 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
497 is_nothrow_copy_assignable<second_type>::value)
504 _LIBCPP_INLINE_VISIBILITY
505 pair& operator=(typename conditional<
506 is_move_assignable<first_type>::value &&
507 is_move_assignable<second_type>::value,
508 pair, __nat>::type&& __p)
509 _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
510 is_nothrow_move_assignable<second_type>::value)
512 first = _VSTD::forward<first_type>(__p.first);
513 second = _VSTD::forward<second_type>(__p.second);
517 template <class _Tuple, _EnableB<
518 _CheckTLC<_Tuple>::template __enable_assign<_Tuple>()
520 _LIBCPP_INLINE_VISIBILITY
521 pair& operator=(_Tuple&& __p) {
522 first = _VSTD::get<0>(_VSTD::forward<_Tuple>(__p));
523 second = _VSTD::get<1>(_VSTD::forward<_Tuple>(__p));
528 _LIBCPP_INLINE_VISIBILITY
530 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
531 __is_nothrow_swappable<second_type>::value)
534 swap(first, __p.first);
535 swap(second, __p.second);
539 #ifndef _LIBCPP_CXX03_LANG
540 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
541 _LIBCPP_INLINE_VISIBILITY
542 pair(piecewise_construct_t,
543 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
544 __tuple_indices<_I1...>, __tuple_indices<_I2...>);
548 template <class _T1, class _T2>
549 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
551 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
553 return __x.first == __y.first && __x.second == __y.second;
556 template <class _T1, class _T2>
557 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
559 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
561 return !(__x == __y);
564 template <class _T1, class _T2>
565 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
567 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
569 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
572 template <class _T1, class _T2>
573 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
575 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
580 template <class _T1, class _T2>
581 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
583 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
588 template <class _T1, class _T2>
589 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
591 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
596 template <class _T1, class _T2>
597 inline _LIBCPP_INLINE_VISIBILITY
600 __is_swappable<_T1>::value &&
601 __is_swappable<_T2>::value,
604 swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
605 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
606 __is_nothrow_swappable<_T2>::value))
611 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
615 struct __make_pair_return_impl
621 struct __make_pair_return_impl<reference_wrapper<_Tp>>
627 struct __make_pair_return
629 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type;
632 template <class _T1, class _T2>
633 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
634 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
635 make_pair(_T1&& __t1, _T2&& __t2)
637 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
638 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
641 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
643 template <class _T1, class _T2>
644 inline _LIBCPP_INLINE_VISIBILITY
646 make_pair(_T1 __x, _T2 __y)
648 return pair<_T1, _T2>(__x, __y);
651 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
653 template <class _T1, class _T2>
654 class _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> >
655 : public integral_constant<size_t, 2> {};
657 template <class _T1, class _T2>
658 class _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
664 template <class _T1, class _T2>
665 class _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> >
671 template <size_t _Ip> struct __get_pair;
676 template <class _T1, class _T2>
678 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
680 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
682 template <class _T1, class _T2>
684 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
686 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
688 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
690 template <class _T1, class _T2>
692 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
694 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
696 template <class _T1, class _T2>
698 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
700 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);}
702 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
708 template <class _T1, class _T2>
710 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
712 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
714 template <class _T1, class _T2>
716 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
718 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
720 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
722 template <class _T1, class _T2>
724 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
726 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
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 _T2>(__p.second);}
734 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
737 template <size_t _Ip, class _T1, class _T2>
738 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
739 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
740 get(pair<_T1, _T2>& __p) _NOEXCEPT
742 return __get_pair<_Ip>::get(__p);
745 template <size_t _Ip, class _T1, class _T2>
746 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
747 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
748 get(const pair<_T1, _T2>& __p) _NOEXCEPT
750 return __get_pair<_Ip>::get(__p);
753 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
755 template <size_t _Ip, class _T1, class _T2>
756 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
757 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
758 get(pair<_T1, _T2>&& __p) _NOEXCEPT
760 return __get_pair<_Ip>::get(_VSTD::move(__p));
763 template <size_t _Ip, class _T1, class _T2>
764 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
765 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
766 get(const pair<_T1, _T2>&& __p) _NOEXCEPT
768 return __get_pair<_Ip>::get(_VSTD::move(__p));
771 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
773 #if _LIBCPP_STD_VER > 11
774 template <class _T1, class _T2>
775 inline _LIBCPP_INLINE_VISIBILITY
776 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
778 return __get_pair<0>::get(__p);
781 template <class _T1, class _T2>
782 inline _LIBCPP_INLINE_VISIBILITY
783 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
785 return __get_pair<0>::get(__p);
788 template <class _T1, class _T2>
789 inline _LIBCPP_INLINE_VISIBILITY
790 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
792 return __get_pair<0>::get(_VSTD::move(__p));
795 template <class _T1, class _T2>
796 inline _LIBCPP_INLINE_VISIBILITY
797 constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT
799 return __get_pair<0>::get(_VSTD::move(__p));
802 template <class _T1, class _T2>
803 inline _LIBCPP_INLINE_VISIBILITY
804 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
806 return __get_pair<1>::get(__p);
809 template <class _T1, class _T2>
810 inline _LIBCPP_INLINE_VISIBILITY
811 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
813 return __get_pair<1>::get(__p);
816 template <class _T1, class _T2>
817 inline _LIBCPP_INLINE_VISIBILITY
818 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
820 return __get_pair<1>::get(_VSTD::move(__p));
823 template <class _T1, class _T2>
824 inline _LIBCPP_INLINE_VISIBILITY
825 constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT
827 return __get_pair<1>::get(_VSTD::move(__p));
832 #if _LIBCPP_STD_VER > 11
834 template<class _Tp, _Tp... _Ip>
835 struct _LIBCPP_TEMPLATE_VIS integer_sequence
837 typedef _Tp value_type;
838 static_assert( is_integral<_Tp>::value,
839 "std::integer_sequence can only be instantiated with an integral type" );
841 _LIBCPP_INLINE_VISIBILITY
844 size() noexcept { return sizeof...(_Ip); }
847 template<size_t... _Ip>
848 using index_sequence = integer_sequence<size_t, _Ip...>;
850 #if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
852 template <class _Tp, _Tp _Ep>
853 using __make_integer_sequence = __make_integer_seq<integer_sequence, _Tp, _Ep>;
857 template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
858 typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>;
860 template <class _Tp, _Tp _Ep>
861 struct __make_integer_sequence_checked
863 static_assert(is_integral<_Tp>::value,
864 "std::make_integer_sequence can only be instantiated with an integral type" );
865 static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length");
866 // Workaround GCC bug by preventing bad installations when 0 <= _Ep
867 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929
868 typedef __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
871 template <class _Tp, _Tp _Ep>
872 using __make_integer_sequence = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
876 template<class _Tp, _Tp _Np>
877 using make_integer_sequence = __make_integer_sequence<_Tp, _Np>;
880 using make_index_sequence = make_integer_sequence<size_t, _Np>;
882 template<class... _Tp>
883 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
885 #endif // _LIBCPP_STD_VER > 11
887 #if _LIBCPP_STD_VER > 11
888 template<class _T1, class _T2 = _T1>
889 inline _LIBCPP_INLINE_VISIBILITY
890 _T1 exchange(_T1& __obj, _T2 && __new_value)
892 _T1 __old_value = _VSTD::move(__obj);
893 __obj = _VSTD::forward<_T2>(__new_value);
896 #endif // _LIBCPP_STD_VER > 11
898 #if _LIBCPP_STD_VER > 14
900 struct _LIBCPP_TYPE_VIS in_place_t {
901 explicit in_place_t() = default;
903 #ifndef _LIBCPP_HAS_NO_INLINE_VARIABLES
906 constexpr in_place_t in_place{};
909 struct _LIBCPP_TYPE_VIS in_place_type_t {
910 explicit in_place_type_t() = default;
913 #ifndef _LIBCPP_HAS_NO_INLINE_VARIABLES
916 constexpr in_place_type_t<_Tp> in_place_type{};
918 template <size_t _Idx>
919 struct _LIBCPP_TYPE_VIS in_place_index_t {
920 explicit in_place_index_t() = default;
922 template <size_t _Idx>
923 #ifndef _LIBCPP_HAS_NO_INLINE_VARIABLES
926 constexpr in_place_index_t<_Idx> in_place_index{};
928 template <class _Tp> struct __is_inplace_type_imp : false_type {};
929 template <class _Tp> struct __is_inplace_type_imp<in_place_type_t<_Tp>> : true_type {};
932 using __is_inplace_type = __is_inplace_type_imp<__uncvref_t<_Tp>>;
934 #endif // _LIBCPP_STD_VER > 14
936 template <class _Arg, class _Result>
937 struct _LIBCPP_TEMPLATE_VIS unary_function
939 typedef _Arg argument_type;
940 typedef _Result result_type;
943 template <class _Size>
944 inline _LIBCPP_INLINE_VISIBILITY
946 __loadword(const void* __p)
949 std::memcpy(&__r, __p, sizeof(__r));
953 // We use murmur2 when size_t is 32 bits, and cityhash64 when size_t
954 // is 64 bits. This is because cityhash64 uses 64bit x 64bit
955 // multiplication, which can be very slow on 32-bit systems.
956 template <class _Size, size_t = sizeof(_Size)*__CHAR_BIT__>
957 struct __murmur2_or_cityhash;
959 template <class _Size>
960 struct __murmur2_or_cityhash<_Size, 32>
962 inline _Size operator()(const void* __key, _Size __len)
963 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
967 template <class _Size>
969 __murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len)
971 const _Size __m = 0x5bd1e995;
972 const _Size __r = 24;
974 const unsigned char* __data = static_cast<const unsigned char*>(__key);
975 for (; __len >= 4; __data += 4, __len -= 4)
977 _Size __k = __loadword<_Size>(__data);
987 __h ^= __data[2] << 16;
989 __h ^= __data[1] << 8;
1000 template <class _Size>
1001 struct __murmur2_or_cityhash<_Size, 64>
1003 inline _Size operator()(const void* __key, _Size __len) _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
1006 // Some primes between 2^63 and 2^64.
1007 static const _Size __k0 = 0xc3a5c85c97cb3127ULL;
1008 static const _Size __k1 = 0xb492b66fbe98f273ULL;
1009 static const _Size __k2 = 0x9ae16a3b2f90404fULL;
1010 static const _Size __k3 = 0xc949d7c7509e6557ULL;
1012 static _Size __rotate(_Size __val, int __shift) {
1013 return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift)));
1016 static _Size __rotate_by_at_least_1(_Size __val, int __shift) {
1017 return (__val >> __shift) | (__val << (64 - __shift));
1020 static _Size __shift_mix(_Size __val) {
1021 return __val ^ (__val >> 47);
1024 static _Size __hash_len_16(_Size __u, _Size __v)
1025 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1027 const _Size __mul = 0x9ddfea08eb382d69ULL;
1028 _Size __a = (__u ^ __v) * __mul;
1030 _Size __b = (__v ^ __a) * __mul;
1036 static _Size __hash_len_0_to_16(const char* __s, _Size __len)
1037 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1040 const _Size __a = __loadword<_Size>(__s);
1041 const _Size __b = __loadword<_Size>(__s + __len - 8);
1042 return __hash_len_16(__a, __rotate_by_at_least_1(__b + __len, __len)) ^ __b;
1045 const uint32_t __a = __loadword<uint32_t>(__s);
1046 const uint32_t __b = __loadword<uint32_t>(__s + __len - 4);
1047 return __hash_len_16(__len + (__a << 3), __b);
1050 const unsigned char __a = __s[0];
1051 const unsigned char __b = __s[__len >> 1];
1052 const unsigned char __c = __s[__len - 1];
1053 const uint32_t __y = static_cast<uint32_t>(__a) +
1054 (static_cast<uint32_t>(__b) << 8);
1055 const uint32_t __z = __len + (static_cast<uint32_t>(__c) << 2);
1056 return __shift_mix(__y * __k2 ^ __z * __k3) * __k2;
1061 static _Size __hash_len_17_to_32(const char *__s, _Size __len)
1062 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1064 const _Size __a = __loadword<_Size>(__s) * __k1;
1065 const _Size __b = __loadword<_Size>(__s + 8);
1066 const _Size __c = __loadword<_Size>(__s + __len - 8) * __k2;
1067 const _Size __d = __loadword<_Size>(__s + __len - 16) * __k0;
1068 return __hash_len_16(__rotate(__a - __b, 43) + __rotate(__c, 30) + __d,
1069 __a + __rotate(__b ^ __k3, 20) - __c + __len);
1072 // Return a 16-byte hash for 48 bytes. Quick and dirty.
1073 // Callers do best to use "random-looking" values for a and b.
1074 static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
1075 _Size __w, _Size __x, _Size __y, _Size __z, _Size __a, _Size __b)
1076 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1079 __b = __rotate(__b + __a + __z, 21);
1080 const _Size __c = __a;
1083 __b += __rotate(__a, 44);
1084 return pair<_Size, _Size>(__a + __z, __b + __c);
1087 // Return a 16-byte hash for s[0] ... s[31], a, and b. Quick and dirty.
1088 static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
1089 const char* __s, _Size __a, _Size __b)
1090 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1092 return __weak_hash_len_32_with_seeds(__loadword<_Size>(__s),
1093 __loadword<_Size>(__s + 8),
1094 __loadword<_Size>(__s + 16),
1095 __loadword<_Size>(__s + 24),
1100 // Return an 8-byte hash for 33 to 64 bytes.
1101 static _Size __hash_len_33_to_64(const char *__s, size_t __len)
1102 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
1104 _Size __z = __loadword<_Size>(__s + 24);
1105 _Size __a = __loadword<_Size>(__s) +
1106 (__len + __loadword<_Size>(__s + __len - 16)) * __k0;
1107 _Size __b = __rotate(__a + __z, 52);
1108 _Size __c = __rotate(__a, 37);
1109 __a += __loadword<_Size>(__s + 8);
1110 __c += __rotate(__a, 7);
1111 __a += __loadword<_Size>(__s + 16);
1112 _Size __vf = __a + __z;
1113 _Size __vs = __b + __rotate(__a, 31) + __c;
1114 __a = __loadword<_Size>(__s + 16) + __loadword<_Size>(__s + __len - 32);
1115 __z += __loadword<_Size>(__s + __len - 8);
1116 __b = __rotate(__a + __z, 52);
1117 __c = __rotate(__a, 37);
1118 __a += __loadword<_Size>(__s + __len - 24);
1119 __c += __rotate(__a, 7);
1120 __a += __loadword<_Size>(__s + __len - 16);
1121 _Size __wf = __a + __z;
1122 _Size __ws = __b + __rotate(__a, 31) + __c;
1123 _Size __r = __shift_mix((__vf + __ws) * __k2 + (__wf + __vs) * __k0);
1124 return __shift_mix(__r * __k0 + __vs) * __k2;
1129 template <class _Size>
1131 __murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len)
1133 const char* __s = static_cast<const char*>(__key);
1136 return __hash_len_0_to_16(__s, __len);
1138 return __hash_len_17_to_32(__s, __len);
1140 } else if (__len <= 64) {
1141 return __hash_len_33_to_64(__s, __len);
1144 // For strings over 64 bytes we hash the end first, and then as we
1145 // loop we keep 56 bytes of state: v, w, x, y, and z.
1146 _Size __x = __loadword<_Size>(__s + __len - 40);
1147 _Size __y = __loadword<_Size>(__s + __len - 16) +
1148 __loadword<_Size>(__s + __len - 56);
1149 _Size __z = __hash_len_16(__loadword<_Size>(__s + __len - 48) + __len,
1150 __loadword<_Size>(__s + __len - 24));
1151 pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
1152 pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
1153 __x = __x * __k1 + __loadword<_Size>(__s);
1155 // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
1156 __len = (__len - 1) & ~static_cast<_Size>(63);
1158 __x = __rotate(__x + __y + __v.first + __loadword<_Size>(__s + 8), 37) * __k1;
1159 __y = __rotate(__y + __v.second + __loadword<_Size>(__s + 48), 42) * __k1;
1161 __y += __v.first + __loadword<_Size>(__s + 40);
1162 __z = __rotate(__z + __w.first, 33) * __k1;
1163 __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
1164 __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
1165 __y + __loadword<_Size>(__s + 16));
1166 std::swap(__z, __x);
1169 } while (__len != 0);
1170 return __hash_len_16(
1171 __hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z,
1172 __hash_len_16(__v.second, __w.second) + __x);
1175 template <class _Tp, size_t = sizeof(_Tp) / sizeof(size_t)>
1176 struct __scalar_hash;
1178 template <class _Tp>
1179 struct __scalar_hash<_Tp, 0>
1180 : public unary_function<_Tp, size_t>
1182 _LIBCPP_INLINE_VISIBILITY
1183 size_t operator()(_Tp __v) const _NOEXCEPT
1196 template <class _Tp>
1197 struct __scalar_hash<_Tp, 1>
1198 : public unary_function<_Tp, size_t>
1200 _LIBCPP_INLINE_VISIBILITY
1201 size_t operator()(_Tp __v) const _NOEXCEPT
1213 template <class _Tp>
1214 struct __scalar_hash<_Tp, 2>
1215 : public unary_function<_Tp, size_t>
1217 _LIBCPP_INLINE_VISIBILITY
1218 size_t operator()(_Tp __v) const _NOEXCEPT
1230 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1234 template <class _Tp>
1235 struct __scalar_hash<_Tp, 3>
1236 : public unary_function<_Tp, size_t>
1238 _LIBCPP_INLINE_VISIBILITY
1239 size_t operator()(_Tp __v) const _NOEXCEPT
1252 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1256 template <class _Tp>
1257 struct __scalar_hash<_Tp, 4>
1258 : public unary_function<_Tp, size_t>
1260 _LIBCPP_INLINE_VISIBILITY
1261 size_t operator()(_Tp __v) const _NOEXCEPT
1275 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1284 _LIBCPP_INLINE_VISIBILITY
1285 inline size_t __hash_combine(size_t __lhs, size_t __rhs) _NOEXCEPT {
1286 typedef __scalar_hash<_PairT> _HashT;
1287 const _PairT __p = {__lhs, __rhs};
1288 return _HashT()(__p);
1292 struct _LIBCPP_TEMPLATE_VIS hash<_Tp*>
1293 : public unary_function<_Tp*, size_t>
1295 _LIBCPP_INLINE_VISIBILITY
1296 size_t operator()(_Tp* __v) const _NOEXCEPT
1304 return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
1310 struct _LIBCPP_TEMPLATE_VIS hash<bool>
1311 : public unary_function<bool, size_t>
1313 _LIBCPP_INLINE_VISIBILITY
1314 size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1318 struct _LIBCPP_TEMPLATE_VIS hash<char>
1319 : public unary_function<char, size_t>
1321 _LIBCPP_INLINE_VISIBILITY
1322 size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1326 struct _LIBCPP_TEMPLATE_VIS hash<signed char>
1327 : public unary_function<signed char, size_t>
1329 _LIBCPP_INLINE_VISIBILITY
1330 size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1334 struct _LIBCPP_TEMPLATE_VIS hash<unsigned char>
1335 : public unary_function<unsigned char, size_t>
1337 _LIBCPP_INLINE_VISIBILITY
1338 size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1341 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
1344 struct _LIBCPP_TEMPLATE_VIS hash<char16_t>
1345 : public unary_function<char16_t, size_t>
1347 _LIBCPP_INLINE_VISIBILITY
1348 size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1352 struct _LIBCPP_TEMPLATE_VIS hash<char32_t>
1353 : public unary_function<char32_t, size_t>
1355 _LIBCPP_INLINE_VISIBILITY
1356 size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1359 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS
1362 struct _LIBCPP_TEMPLATE_VIS hash<wchar_t>
1363 : public unary_function<wchar_t, size_t>
1365 _LIBCPP_INLINE_VISIBILITY
1366 size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1370 struct _LIBCPP_TEMPLATE_VIS hash<short>
1371 : public unary_function<short, size_t>
1373 _LIBCPP_INLINE_VISIBILITY
1374 size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1378 struct _LIBCPP_TEMPLATE_VIS hash<unsigned short>
1379 : public unary_function<unsigned short, size_t>
1381 _LIBCPP_INLINE_VISIBILITY
1382 size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1386 struct _LIBCPP_TEMPLATE_VIS hash<int>
1387 : public unary_function<int, size_t>
1389 _LIBCPP_INLINE_VISIBILITY
1390 size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1394 struct _LIBCPP_TEMPLATE_VIS hash<unsigned int>
1395 : public unary_function<unsigned int, size_t>
1397 _LIBCPP_INLINE_VISIBILITY
1398 size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1402 struct _LIBCPP_TEMPLATE_VIS hash<long>
1403 : public unary_function<long, size_t>
1405 _LIBCPP_INLINE_VISIBILITY
1406 size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1410 struct _LIBCPP_TEMPLATE_VIS hash<unsigned long>
1411 : public unary_function<unsigned long, size_t>
1413 _LIBCPP_INLINE_VISIBILITY
1414 size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1418 struct _LIBCPP_TEMPLATE_VIS hash<long long>
1419 : public __scalar_hash<long long>
1424 struct _LIBCPP_TEMPLATE_VIS hash<unsigned long long>
1425 : public __scalar_hash<unsigned long long>
1429 #ifndef _LIBCPP_HAS_NO_INT128
1432 struct _LIBCPP_TEMPLATE_VIS hash<__int128_t>
1433 : public __scalar_hash<__int128_t>
1438 struct _LIBCPP_TEMPLATE_VIS hash<__uint128_t>
1439 : public __scalar_hash<__uint128_t>
1446 struct _LIBCPP_TEMPLATE_VIS hash<float>
1447 : public __scalar_hash<float>
1449 _LIBCPP_INLINE_VISIBILITY
1450 size_t operator()(float __v) const _NOEXCEPT
1452 // -0.0 and 0.0 should return same hash
1455 return __scalar_hash<float>::operator()(__v);
1460 struct _LIBCPP_TEMPLATE_VIS hash<double>
1461 : public __scalar_hash<double>
1463 _LIBCPP_INLINE_VISIBILITY
1464 size_t operator()(double __v) const _NOEXCEPT
1466 // -0.0 and 0.0 should return same hash
1469 return __scalar_hash<double>::operator()(__v);
1474 struct _LIBCPP_TEMPLATE_VIS hash<long double>
1475 : public __scalar_hash<long double>
1477 _LIBCPP_INLINE_VISIBILITY
1478 size_t operator()(long double __v) const _NOEXCEPT
1480 // -0.0 and 0.0 should return same hash
1483 #if defined(__i386__)
1484 // Zero out padding bits
1501 return __u.__s.__a ^ __u.__s.__b ^ __u.__s.__c ^ __u.__s.__d;
1502 #elif defined(__x86_64__)
1503 // Zero out padding bits
1516 return __u.__s.__a ^ __u.__s.__b;
1518 return __scalar_hash<long double>::operator()(__v);
1523 #if _LIBCPP_STD_VER > 11
1525 template <class _Tp, bool = is_enum<_Tp>::value>
1526 struct _LIBCPP_TEMPLATE_VIS __enum_hash
1527 : public unary_function<_Tp, size_t>
1529 _LIBCPP_INLINE_VISIBILITY
1530 size_t operator()(_Tp __v) const _NOEXCEPT
1532 typedef typename underlying_type<_Tp>::type type;
1533 return hash<type>{}(static_cast<type>(__v));
1536 template <class _Tp>
1537 struct _LIBCPP_TEMPLATE_VIS __enum_hash<_Tp, false> {
1538 __enum_hash() = delete;
1539 __enum_hash(__enum_hash const&) = delete;
1540 __enum_hash& operator=(__enum_hash const&) = delete;
1543 template <class _Tp>
1544 struct _LIBCPP_TEMPLATE_VIS hash : public __enum_hash<_Tp>
1549 #if _LIBCPP_STD_VER > 14
1552 struct _LIBCPP_TEMPLATE_VIS hash<nullptr_t>
1553 : public unary_function<nullptr_t, size_t>
1555 _LIBCPP_INLINE_VISIBILITY
1556 size_t operator()(nullptr_t) const _NOEXCEPT {
1557 return 662607004ull;
1562 #ifndef _LIBCPP_CXX03_LANG
1563 template <class _Key, class _Hash>
1564 using __check_hash_requirements = integral_constant<bool,
1565 is_copy_constructible<_Hash>::value &&
1566 is_move_constructible<_Hash>::value &&
1567 __invokable_r<size_t, _Hash, _Key const&>::value
1570 template <class _Key, class _Hash = std::hash<_Key> >
1571 using __has_enabled_hash = integral_constant<bool,
1572 __check_hash_requirements<_Key, _Hash>::value &&
1573 is_default_constructible<_Hash>::value
1576 #if _LIBCPP_STD_VER > 14
1577 template <class _Type, class>
1578 using __enable_hash_helper_imp = _Type;
1580 template <class _Type, class ..._Keys>
1581 using __enable_hash_helper = __enable_hash_helper_imp<_Type,
1582 typename enable_if<__all<__has_enabled_hash<_Keys>::value...>::value>::type
1585 template <class _Type, class ...>
1586 using __enable_hash_helper = _Type;
1589 #endif // !_LIBCPP_CXX03_LANG
1591 _LIBCPP_END_NAMESPACE_STD
1593 #endif // _LIBCPP_UTILITY