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> typename add_rvalue_reference<T>::type declval() noexcept;
57 template <class T1, class T2>
60 typedef T1 first_type;
61 typedef T2 second_type;
66 pair(const pair&) = default;
67 pair(pair&&) = default;
69 pair(const T1& x, const T2& y); // constexpr in C++14
70 template <class U, class V> pair(U&& x, V&& y); // constexpr in C++14
71 template <class U, class V> pair(const pair<U, V>& p); // constexpr in C++14
72 template <class U, class V> pair(pair<U, V>&& p); // constexpr in C++14
73 template <class... Args1, class... Args2>
74 pair(piecewise_construct_t, tuple<Args1...> first_args,
75 tuple<Args2...> second_args);
77 template <class U, class V> pair& operator=(const pair<U, V>& p);
78 pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value &&
79 is_nothrow_move_assignable<T2>::value);
80 template <class U, class V> pair& operator=(pair<U, V>&& p);
82 void swap(pair& p) noexcept(noexcept(swap(first, p.first)) &&
83 noexcept(swap(second, p.second)));
86 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
87 template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
88 template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
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
93 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14
94 template <class T1, class T2>
96 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
98 struct piecewise_construct_t { };
99 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
101 template <class T> class tuple_size;
102 template <size_t I, class T> class tuple_element;
104 template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
105 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >;
106 template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >;
108 template<size_t I, class T1, class T2>
109 typename tuple_element<I, pair<T1, T2> >::type&
110 get(pair<T1, T2>&) noexcept; // constexpr in C++14
112 template<size_t I, class T1, class T2>
113 const typename const tuple_element<I, pair<T1, T2> >::type&
114 get(const pair<T1, T2>&) noexcept; // constexpr in C++14
116 template<size_t I, class T1, class T2>
117 typename tuple_element<I, pair<T1, T2> >::type&&
118 get(pair<T1, T2>&&) noexcept; // constexpr in C++14
120 template<class T1, class T2>
121 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
123 template<size_t I, class T1, class T2>
124 constexpr T1 const& get(pair<T1, T2> const &) noexcept; // C++14
126 template<size_t I, class T1, class T2>
127 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14
131 template<class T, T... I>
132 struct integer_sequence
134 typedef T value_type;
136 static constexpr size_t size() noexcept;
139 template<size_t... I>
140 using index_sequence = integer_sequence<size_t, I...>;
142 template<class T, T N>
143 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
145 using make_index_sequence = make_integer_sequence<size_t, N>;
148 using index_sequence_for = make_index_sequence<sizeof...(T)>;
150 template<class T, class U=T>
151 T exchange(T& obj, U&& new_value);
158 #include <type_traits>
160 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
161 #pragma GCC system_header
164 _LIBCPP_BEGIN_NAMESPACE_STD
170 inline _LIBCPP_INLINE_VISIBILITY
172 operator!=(const _Tp& __x, const _Tp& __y)
174 return !(__x == __y);
178 inline _LIBCPP_INLINE_VISIBILITY
180 operator> (const _Tp& __x, const _Tp& __y)
186 inline _LIBCPP_INLINE_VISIBILITY
188 operator<=(const _Tp& __x, const _Tp& __y)
194 inline _LIBCPP_INLINE_VISIBILITY
196 operator>=(const _Tp& __x, const _Tp& __y)
205 template <class _ForwardIterator1, class _ForwardIterator2>
206 inline _LIBCPP_INLINE_VISIBILITY
208 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
210 for(; __first1 != __last1; ++__first1, (void) ++__first2)
211 swap(*__first1, *__first2);
215 template<class _Tp, size_t _Np>
216 inline _LIBCPP_INLINE_VISIBILITY
218 swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
220 _VSTD::swap_ranges(__a, __a + _Np, __b);
224 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
225 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
228 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
232 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
235 move_if_noexcept(_Tp& __x) _NOEXCEPT
237 return _VSTD::move(__x);
240 struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { };
241 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY)
242 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
244 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
247 template <class _T1, class _T2>
248 struct _LIBCPP_TYPE_VIS_ONLY pair
250 typedef _T1 first_type;
251 typedef _T2 second_type;
256 // pair(const pair&) = default;
257 // pair(pair&&) = default;
259 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {}
261 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
262 pair(const _T1& __x, const _T2& __y)
263 : first(__x), second(__y) {}
265 template<class _U1, class _U2>
266 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
267 pair(const pair<_U1, _U2>& __p
268 #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
269 ,typename enable_if<is_convertible<const _U1&, _T1>::value &&
270 is_convertible<const _U2&, _T2>::value>::type* = 0
273 : first(__p.first), second(__p.second) {}
275 #if !defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && _LIBCPP_TRIVIAL_PAIR_COPY_CTOR
276 _LIBCPP_INLINE_VISIBILITY
277 pair(const pair& __p) = default;
278 #elif !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) || !_LIBCPP_TRIVIAL_PAIR_COPY_CTOR
279 _LIBCPP_INLINE_VISIBILITY
280 pair(const pair& __p)
281 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
282 is_nothrow_copy_constructible<second_type>::value)
289 _LIBCPP_INLINE_VISIBILITY
290 pair& operator=(const pair& __p)
291 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
292 is_nothrow_copy_assignable<second_type>::value)
299 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
301 template <class _U1, class _U2,
302 class = typename enable_if<is_convertible<_U1, first_type>::value &&
303 is_convertible<_U2, second_type>::value>::type>
304 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
305 pair(_U1&& __u1, _U2&& __u2)
306 : first(_VSTD::forward<_U1>(__u1)),
307 second(_VSTD::forward<_U2>(__u2))
310 template<class _U1, class _U2>
311 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
312 pair(pair<_U1, _U2>&& __p,
313 typename enable_if<is_convertible<_U1, _T1>::value &&
314 is_convertible<_U2, _T2>::value>::type* = 0)
315 : first(_VSTD::forward<_U1>(__p.first)),
316 second(_VSTD::forward<_U2>(__p.second)) {}
318 #ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
319 _LIBCPP_INLINE_VISIBILITY
320 pair(pair&& __p) = default;
322 _LIBCPP_INLINE_VISIBILITY
323 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
324 is_nothrow_move_constructible<second_type>::value)
325 : first(_VSTD::forward<first_type>(__p.first)),
326 second(_VSTD::forward<second_type>(__p.second))
331 _LIBCPP_INLINE_VISIBILITY
333 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
334 is_nothrow_move_assignable<second_type>::value)
336 first = _VSTD::forward<first_type>(__p.first);
337 second = _VSTD::forward<second_type>(__p.second);
341 #ifndef _LIBCPP_HAS_NO_VARIADICS
343 template<class _Tuple,
344 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
345 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
347 : first(_VSTD::forward<typename tuple_element<0,
348 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<0>(__p))),
349 second(_VSTD::forward<typename tuple_element<1,
350 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<1>(__p)))
355 template <class... _Args1, class... _Args2>
356 _LIBCPP_INLINE_VISIBILITY
357 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
358 tuple<_Args2...> __second_args)
359 : pair(__pc, __first_args, __second_args,
360 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
361 typename __make_tuple_indices<sizeof...(_Args2) >::type())
364 template <class _Tuple,
365 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
366 _LIBCPP_INLINE_VISIBILITY
368 operator=(_Tuple&& __p)
370 typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
371 typedef typename tuple_element<0, _TupleRef>::type _U0;
372 typedef typename tuple_element<1, _TupleRef>::type _U1;
373 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p));
374 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p));
378 #endif // _LIBCPP_HAS_NO_VARIADICS
380 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
381 _LIBCPP_INLINE_VISIBILITY
383 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
384 __is_nothrow_swappable<second_type>::value)
386 _VSTD::iter_swap(&first, &__p.first);
387 _VSTD::iter_swap(&second, &__p.second);
391 #ifndef _LIBCPP_HAS_NO_VARIADICS
392 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
393 _LIBCPP_INLINE_VISIBILITY
394 pair(piecewise_construct_t,
395 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
396 __tuple_indices<_I1...>, __tuple_indices<_I2...>);
397 #endif // _LIBCPP_HAS_NO_VARIADICS
400 template <class _T1, class _T2>
401 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
403 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
405 return __x.first == __y.first && __x.second == __y.second;
408 template <class _T1, class _T2>
409 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
411 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
413 return !(__x == __y);
416 template <class _T1, class _T2>
417 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
419 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
421 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
424 template <class _T1, class _T2>
425 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
427 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
432 template <class _T1, class _T2>
433 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
435 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
440 template <class _T1, class _T2>
441 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
443 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
448 template <class _T1, class _T2>
449 inline _LIBCPP_INLINE_VISIBILITY
452 __is_swappable<_T1>::value &&
453 __is_swappable<_T2>::value,
456 swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
457 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
458 __is_nothrow_swappable<_T2>::value))
463 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
465 template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper;
468 struct __make_pair_return_impl
474 struct __make_pair_return_impl<reference_wrapper<_Tp>>
480 struct __make_pair_return
482 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type;
485 template <class _T1, class _T2>
486 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
487 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
488 make_pair(_T1&& __t1, _T2&& __t2)
490 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
491 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
494 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
496 template <class _T1, class _T2>
497 inline _LIBCPP_INLINE_VISIBILITY
499 make_pair(_T1 __x, _T2 __y)
501 return pair<_T1, _T2>(__x, __y);
504 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
506 template <class _T1, class _T2>
507 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> >
508 : public integral_constant<size_t, 2> {};
510 template <class _T1, class _T2>
511 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const pair<_T1, _T2> >
512 : public integral_constant<size_t, 2> {};
514 template <class _T1, class _T2>
515 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> >
521 template <class _T1, class _T2>
522 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> >
528 template <class _T1, class _T2>
529 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, const pair<_T1, _T2> >
532 typedef const _T1 type;
535 template <class _T1, class _T2>
536 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, const pair<_T1, _T2> >
539 typedef const _T2 type;
542 template <size_t _Ip> struct __get_pair;
547 template <class _T1, class _T2>
549 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
551 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
553 template <class _T1, class _T2>
555 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
557 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
559 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
561 template <class _T1, class _T2>
563 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
565 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
567 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
573 template <class _T1, class _T2>
575 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
577 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
579 template <class _T1, class _T2>
581 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
583 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
585 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
587 template <class _T1, class _T2>
589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
591 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
593 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
596 template <size_t _Ip, class _T1, class _T2>
597 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
598 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
599 get(pair<_T1, _T2>& __p) _NOEXCEPT
601 return __get_pair<_Ip>::get(__p);
604 template <size_t _Ip, class _T1, class _T2>
605 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
606 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
607 get(const pair<_T1, _T2>& __p) _NOEXCEPT
609 return __get_pair<_Ip>::get(__p);
612 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
614 template <size_t _Ip, class _T1, class _T2>
615 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
616 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
617 get(pair<_T1, _T2>&& __p) _NOEXCEPT
619 return __get_pair<_Ip>::get(_VSTD::move(__p));
622 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
624 #if _LIBCPP_STD_VER > 11
625 template <class _T1, class _T2>
626 inline _LIBCPP_INLINE_VISIBILITY
627 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
629 return __get_pair<0>::get(__p);
632 template <class _T1, class _T2>
633 inline _LIBCPP_INLINE_VISIBILITY
634 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
636 return __get_pair<0>::get(__p);
639 template <class _T1, class _T2>
640 inline _LIBCPP_INLINE_VISIBILITY
641 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
643 return __get_pair<0>::get(_VSTD::move(__p));
646 template <class _T1, class _T2>
647 inline _LIBCPP_INLINE_VISIBILITY
648 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
650 return __get_pair<1>::get(__p);
653 template <class _T1, class _T2>
654 inline _LIBCPP_INLINE_VISIBILITY
655 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
657 return __get_pair<1>::get(__p);
660 template <class _T1, class _T2>
661 inline _LIBCPP_INLINE_VISIBILITY
662 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
664 return __get_pair<1>::get(_VSTD::move(__p));
669 #if _LIBCPP_STD_VER > 11
671 template<class _Tp, _Tp... _Ip>
672 struct _LIBCPP_TYPE_VIS_ONLY integer_sequence
674 typedef _Tp value_type;
675 static_assert( is_integral<_Tp>::value,
676 "std::integer_sequence can only be instantiated with an integral type" );
678 _LIBCPP_INLINE_VISIBILITY
681 size() noexcept { return sizeof...(_Ip); }
684 template<size_t... _Ip>
685 using index_sequence = integer_sequence<size_t, _Ip...>;
689 template<typename _Tp, size_t ..._Extra> struct __repeat;
690 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> {
691 typedef integer_sequence<_Tp,
693 sizeof...(_Np) + _Np...,
694 2 * sizeof...(_Np) + _Np...,
695 3 * sizeof...(_Np) + _Np...,
696 4 * sizeof...(_Np) + _Np...,
697 5 * sizeof...(_Np) + _Np...,
698 6 * sizeof...(_Np) + _Np...,
699 7 * sizeof...(_Np) + _Np...,
703 template<size_t _Np> struct __parity;
704 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
706 template<> struct __make<0> { typedef integer_sequence<size_t> type; };
707 template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; };
708 template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; };
709 template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; };
710 template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; };
711 template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
712 template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
713 template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
715 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
716 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
717 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
718 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
719 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
720 template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
721 template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
722 template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
724 template<typename _Tp, typename _Up> struct __convert {
725 template<typename> struct __result;
726 template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; };
728 template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; };
732 template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
733 typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type;
735 template <class _Tp, _Tp _Ep>
736 struct __make_integer_sequence
738 static_assert(is_integral<_Tp>::value,
739 "std::make_integer_sequence can only be instantiated with an integral type" );
740 static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative");
741 typedef __make_integer_sequence_unchecked<_Tp, _Ep> type;
744 template<class _Tp, _Tp _Np>
745 using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type;
748 using make_index_sequence = make_integer_sequence<size_t, _Np>;
750 template<class... _Tp>
751 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
753 #endif // _LIBCPP_STD_VER > 11
755 #if _LIBCPP_STD_VER > 11
756 template<class _T1, class _T2 = _T1>
757 inline _LIBCPP_INLINE_VISIBILITY
758 _T1 exchange(_T1& __obj, _T2 && __new_value)
760 _T1 __old_value = _VSTD::move(__obj);
761 __obj = _VSTD::forward<_T2>(__new_value);
764 #endif // _LIBCPP_STD_VER > 11
766 _LIBCPP_END_NAMESPACE_STD
768 #endif // _LIBCPP_UTILITY