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Howard Hinnantbc8d3f92010-05-11 19:42:16 +00001// -*- C++ -*-
2//===-------------------------- utility -----------------------------------===//
3//
Howard Hinnantf5256e12010-05-11 21:36:01 +00004// The LLVM Compiler Infrastructure
Howard Hinnantbc8d3f92010-05-11 19:42:16 +00005//
Howard Hinnantb64f8b02010-11-16 22:09:02 +00006// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
Howard Hinnantbc8d3f92010-05-11 19:42:16 +00008//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_UTILITY
12#define _LIBCPP_UTILITY
13
14/*
15 utility synopsis
16
17namespace std
18{
19
20template <class T>
21 void
22 swap(T& a, T& b);
23
24namespace rel_ops
25{
26 template<class T> bool operator!=(const T&, const T&);
27 template<class T> bool operator> (const T&, const T&);
28 template<class T> bool operator<=(const T&, const T&);
29 template<class T> bool operator>=(const T&, const T&);
30}
31
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000032template<class T>
33void
34swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value &&
35 is_nothrow_move_assignable<T>::value);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000036
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000037template <class T, size_t N>
38void
39swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));
40
41template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept;
42template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept;
43
44template <class T> typename remove_reference<T>::type&& move(T&&) noexcept;
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000045
46template <class T>
47 typename conditional
48 <
Howard Hinnant1468b662010-11-19 22:17:28 +000049 !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000050 const T&,
51 T&&
52 >::type
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000053 move_if_noexcept(T& x) noexcept;
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000054
55template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
56
57template <class T1, class T2>
58struct pair
59{
60 typedef T1 first_type;
61 typedef T2 second_type;
62
63 T1 first;
64 T2 second;
65
66 pair(const pair&) = default;
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000067 pair(pair&&) = default;
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000068 constexpr pair();
69 pair(const T1& x, const T2& y);
70 template <class U, class V> pair(U&& x, V&& y);
71 template <class U, class V> pair(const pair<U, V>& p);
72 template <class U, class V> pair(pair<U, V>&& p);
73 template <class... Args1, class... Args2>
74 pair(piecewise_construct_t, tuple<Args1...> first_args,
75 tuple<Args2...> second_args);
76
77 template <class U, class V> pair& operator=(const pair<U, V>& p);
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000078 pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value &&
79 is_nothrow_move_assignable<T2>::value);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000080 template <class U, class V> pair& operator=(pair<U, V>&& p);
81
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000082 void swap(pair& p) noexcept(noexcept(swap(first, p.first)) &&
83 noexcept(swap(second, p.second)));
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000084};
85
86template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&);
87template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&);
88template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&);
89template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&);
90template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&);
91template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&);
92
93template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);
Howard Hinnante9b2c2d2011-05-27 15:04:19 +000094template <class T1, class T2>
95void
96swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
Howard Hinnantbc8d3f92010-05-11 19:42:16 +000097
98struct piecewise_construct_t { };
99constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
100
101template <class T> class tuple_size;
102template <size_t I, class T> class tuple_element;
103
104template <class T1, class T2> struct tuple_size<std::pair<T1, T2> >;
105template <class T1, class T2> struct tuple_element<0, std::pair<T1, T2> >;
106template <class T1, class T2> struct tuple_element<1, std::pair<T1, T2> >;
107
108template<size_t I, class T1, class T2>
109 typename tuple_element<I, std::pair<T1, T2> >::type&
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000110 get(std::pair<T1, T2>&) noexcept;
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000111
112template<size_t I, class T1, class T2>
113 const typename const tuple_element<I, std::pair<T1, T2> >::type&
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000114 get(const std::pair<T1, T2>&) noexcept;
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000115
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000116template<size_t I, class T1, class T2>
117 typename tuple_element<I, std::pair<T1, T2> >::type&&
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000118 get(std::pair<T1, T2>&&) noexcept;
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000119
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000120// C++14
121
122template<class T, T... I>
123struct integer_sequence
124{
125 typedef T value_type;
126
127 static constexpr size_t size() noexcept;
128};
129
130template<size_t... I>
131 using index_sequence = integer_sequence<size_t, I...>;
132
133template<class T, T N>
134 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
135template<size_t N>
136 using make_index_sequence = make_integer_sequence<size_t, N>;
137
138template<class... T>
139 using index_sequence_for = make_index_sequence<sizeof...(T)>;
140
Marshall Clowe2735d12013-07-08 20:54:40 +0000141template<class T, class U=T>
142 T exchange(T& obj, U&& new_value);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000143} // std
144
145*/
146
147#include <__config>
148#include <__tuple>
149#include <type_traits>
150
Howard Hinnant08e17472011-10-17 20:05:10 +0000151#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000152#pragma GCC system_header
Howard Hinnant08e17472011-10-17 20:05:10 +0000153#endif
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000154
155_LIBCPP_BEGIN_NAMESPACE_STD
156
157namespace rel_ops
158{
159
160template<class _Tp>
161inline _LIBCPP_INLINE_VISIBILITY
162bool
163operator!=(const _Tp& __x, const _Tp& __y)
164{
165 return !(__x == __y);
166}
167
168template<class _Tp>
169inline _LIBCPP_INLINE_VISIBILITY
170bool
171operator> (const _Tp& __x, const _Tp& __y)
172{
173 return __y < __x;
174}
175
176template<class _Tp>
177inline _LIBCPP_INLINE_VISIBILITY
178bool
179operator<=(const _Tp& __x, const _Tp& __y)
180{
181 return !(__y < __x);
182}
183
184template<class _Tp>
185inline _LIBCPP_INLINE_VISIBILITY
186bool
187operator>=(const _Tp& __x, const _Tp& __y)
188{
189 return !(__x < __y);
190}
191
192} // rel_ops
193
194// swap_ranges
195
196template <class _ForwardIterator1, class _ForwardIterator2>
197inline _LIBCPP_INLINE_VISIBILITY
198_ForwardIterator2
199swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
200{
201 for(; __first1 != __last1; ++__first1, ++__first2)
202 swap(*__first1, *__first2);
203 return __first2;
204}
205
Howard Hinnant99968442011-11-29 18:15:50 +0000206template<class _Tp, size_t _Np>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000207inline _LIBCPP_INLINE_VISIBILITY
208void
Howard Hinnant99968442011-11-29 18:15:50 +0000209swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000210{
Howard Hinnant99968442011-11-29 18:15:50 +0000211 _VSTD::swap_ranges(__a, __a + _Np, __b);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000212}
213
214template <class _Tp>
215inline _LIBCPP_INLINE_VISIBILITY
Howard Hinnant73d21a42010-09-04 23:28:19 +0000216#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000217typename conditional
218<
Howard Hinnant1468b662010-11-19 22:17:28 +0000219 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000220 const _Tp&,
221 _Tp&&
222>::type
Howard Hinnant73d21a42010-09-04 23:28:19 +0000223#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000224const _Tp&
225#endif
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000226move_if_noexcept(_Tp& __x) _NOEXCEPT
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000227{
Howard Hinnant0949eed2011-06-30 21:18:19 +0000228 return _VSTD::move(__x);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000229}
230
Howard Hinnant83eade62013-03-06 23:30:19 +0000231struct _LIBCPP_TYPE_VIS piecewise_construct_t { };
Howard Hinnant616e92d2012-04-03 23:45:46 +0000232#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY)
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000233extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
Howard Hinnant2a5349b2012-04-03 21:09:48 +0000234#else
235constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
236#endif
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000237
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000238template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000239struct _LIBCPP_TYPE_VIS pair
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000240{
241 typedef _T1 first_type;
242 typedef _T2 second_type;
243
244 _T1 first;
245 _T2 second;
246
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000247 // pair(const pair&) = default;
248 // pair(pair&&) = default;
249
Howard Hinnant2a5349b2012-04-03 21:09:48 +0000250 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000251
252 _LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
253 : first(__x), second(__y) {}
254
Howard Hinnant469d4192011-04-29 18:10:55 +0000255 template<class _U1, class _U2>
256 _LIBCPP_INLINE_VISIBILITY
Howard Hinnant9c59d382011-07-27 19:25:28 +0000257 pair(const pair<_U1, _U2>& __p
258#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
Howard Hinnantfe592762012-06-09 20:01:23 +0000259 ,typename enable_if<is_convertible<const _U1&, _T1>::value &&
260 is_convertible<const _U2&, _T2>::value>::type* = 0
Howard Hinnant9c59d382011-07-27 19:25:28 +0000261#endif
262 )
Howard Hinnant469d4192011-04-29 18:10:55 +0000263 : first(__p.first), second(__p.second) {}
264
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000265 _LIBCPP_INLINE_VISIBILITY
Howard Hinnant61aa6012011-07-01 19:24:36 +0000266 pair(const pair& __p)
267 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
268 is_nothrow_copy_constructible<second_type>::value)
269 : first(__p.first),
270 second(__p.second)
271 {
272 }
273
274 _LIBCPP_INLINE_VISIBILITY
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000275 pair& operator=(const pair& __p)
Howard Hinnant61aa6012011-07-01 19:24:36 +0000276 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
277 is_nothrow_copy_assignable<second_type>::value)
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000278 {
279 first = __p.first;
280 second = __p.second;
281 return *this;
282 }
283
Howard Hinnant73d21a42010-09-04 23:28:19 +0000284#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000285
286 template <class _U1, class _U2,
Howard Hinnantfe592762012-06-09 20:01:23 +0000287 class = typename enable_if<is_convertible<_U1, first_type>::value &&
288 is_convertible<_U2, second_type>::value>::type>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000289 _LIBCPP_INLINE_VISIBILITY
290 pair(_U1&& __u1, _U2&& __u2)
Howard Hinnant0949eed2011-06-30 21:18:19 +0000291 : first(_VSTD::forward<_U1>(__u1)),
292 second(_VSTD::forward<_U2>(__u2))
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000293 {}
294
Howard Hinnant469d4192011-04-29 18:10:55 +0000295 template<class _U1, class _U2>
296 _LIBCPP_INLINE_VISIBILITY
297 pair(pair<_U1, _U2>&& __p,
Howard Hinnantfe592762012-06-09 20:01:23 +0000298 typename enable_if<is_convertible<_U1, _T1>::value &&
299 is_convertible<_U2, _T2>::value>::type* = 0)
Howard Hinnant0949eed2011-06-30 21:18:19 +0000300 : first(_VSTD::forward<_U1>(__p.first)),
301 second(_VSTD::forward<_U2>(__p.second)) {}
Howard Hinnant469d4192011-04-29 18:10:55 +0000302
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000303 _LIBCPP_INLINE_VISIBILITY
Howard Hinnant61aa6012011-07-01 19:24:36 +0000304 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
305 is_nothrow_move_constructible<second_type>::value)
306 : first(_VSTD::forward<first_type>(__p.first)),
307 second(_VSTD::forward<second_type>(__p.second))
308 {
309 }
310
311 _LIBCPP_INLINE_VISIBILITY
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000312 pair&
313 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
314 is_nothrow_move_assignable<second_type>::value)
315 {
Howard Hinnant0949eed2011-06-30 21:18:19 +0000316 first = _VSTD::forward<first_type>(__p.first);
317 second = _VSTD::forward<second_type>(__p.second);
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000318 return *this;
319 }
320
Michael J. Spencer626916f2010-12-10 19:47:54 +0000321#ifndef _LIBCPP_HAS_NO_VARIADICS
322
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000323 template<class _Tuple,
324 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
325 _LIBCPP_INLINE_VISIBILITY
326 pair(_Tuple&& __p)
Howard Hinnant0949eed2011-06-30 21:18:19 +0000327 : first(_VSTD::forward<typename tuple_element<0,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000328 typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))),
Howard Hinnant0949eed2011-06-30 21:18:19 +0000329 second(_VSTD::forward<typename tuple_element<1,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000330 typename __make_tuple_types<_Tuple>::type>::type>(get<1>(__p)))
331 {}
332
Michael J. Spencer626916f2010-12-10 19:47:54 +0000333
Howard Hinnant726a76f2010-11-16 21:10:23 +0000334
Howard Hinnant6cc99fa2011-12-19 17:58:44 +0000335 template <class... _Args1, class... _Args2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000336 _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000337 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
338 tuple<_Args2...> __second_args)
Howard Hinnant324bb032010-08-22 00:02:43 +0000339 : pair(__pc, __first_args, __second_args,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000340 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
341 typename __make_tuple_indices<sizeof...(_Args2) >::type())
342 {}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000343
344 template <class _Tuple,
345 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000346 _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000347 pair&
348 operator=(_Tuple&& __p)
349 {
350 typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
351 typedef typename tuple_element<0, _TupleRef>::type _U0;
352 typedef typename tuple_element<1, _TupleRef>::type _U1;
Howard Hinnant0949eed2011-06-30 21:18:19 +0000353 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p));
354 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p));
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000355 return *this;
356 }
357
Michael J. Spencer626916f2010-12-10 19:47:54 +0000358#endif // _LIBCPP_HAS_NO_VARIADICS
359
Howard Hinnant73d21a42010-09-04 23:28:19 +0000360#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000361 _LIBCPP_INLINE_VISIBILITY
362 void
Howard Hinnanta5e01212011-05-27 19:08:18 +0000363 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
364 __is_nothrow_swappable<second_type>::value)
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000365 {
Howard Hinnant0949eed2011-06-30 21:18:19 +0000366 _VSTD::iter_swap(&first, &__p.first);
367 _VSTD::iter_swap(&second, &__p.second);
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000368 }
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000369private:
Howard Hinnant324bb032010-08-22 00:02:43 +0000370
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000371#ifndef _LIBCPP_HAS_NO_VARIADICS
372 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
Howard Hinnant5f5859c2011-01-13 20:05:05 +0000373 _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000374 pair(piecewise_construct_t,
375 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
376 __tuple_indices<_I1...>, __tuple_indices<_I2...>);
Howard Hinnant324bb032010-08-22 00:02:43 +0000377#endif // _LIBCPP_HAS_NO_VARIADICS
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000378};
379
380template <class _T1, class _T2>
381inline _LIBCPP_INLINE_VISIBILITY
382bool
383operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
384{
385 return __x.first == __y.first && __x.second == __y.second;
386}
387
388template <class _T1, class _T2>
389inline _LIBCPP_INLINE_VISIBILITY
390bool
391operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
392{
393 return !(__x == __y);
394}
395
396template <class _T1, class _T2>
397inline _LIBCPP_INLINE_VISIBILITY
398bool
399operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
400{
401 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
402}
403
404template <class _T1, class _T2>
405inline _LIBCPP_INLINE_VISIBILITY
406bool
407operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
408{
409 return __y < __x;
410}
411
412template <class _T1, class _T2>
413inline _LIBCPP_INLINE_VISIBILITY
414bool
415operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
416{
417 return !(__x < __y);
418}
419
420template <class _T1, class _T2>
421inline _LIBCPP_INLINE_VISIBILITY
422bool
423operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
424{
425 return !(__y < __x);
426}
427
428template <class _T1, class _T2>
429inline _LIBCPP_INLINE_VISIBILITY
Howard Hinnantaabf2872011-06-01 19:59:32 +0000430typename enable_if
431<
432 __is_swappable<_T1>::value &&
433 __is_swappable<_T2>::value,
434 void
435>::type
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000436swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
Howard Hinnanta5e01212011-05-27 19:08:18 +0000437 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
438 __is_nothrow_swappable<_T2>::value))
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000439{
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000440 __x.swap(__y);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000441}
442
Howard Hinnant73d21a42010-09-04 23:28:19 +0000443#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000444
Howard Hinnant83eade62013-03-06 23:30:19 +0000445template <class _Tp> class _LIBCPP_TYPE_VIS reference_wrapper;
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000446
447template <class _Tp>
448struct ___make_pair_return
449{
450 typedef _Tp type;
451};
452
453template <class _Tp>
454struct ___make_pair_return<reference_wrapper<_Tp>>
455{
456 typedef _Tp& type;
457};
458
459template <class _Tp>
460struct __make_pair_return
461{
462 typedef typename ___make_pair_return<typename decay<_Tp>::type>::type type;
463};
464
465template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000466inline _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000467pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
468make_pair(_T1&& __t1, _T2&& __t2)
469{
470 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
Howard Hinnant0949eed2011-06-30 21:18:19 +0000471 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000472}
473
Howard Hinnant73d21a42010-09-04 23:28:19 +0000474#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000475
476template <class _T1, class _T2>
477inline _LIBCPP_INLINE_VISIBILITY
478pair<_T1,_T2>
479make_pair(_T1 __x, _T2 __y)
480{
481 return pair<_T1, _T2>(__x, __y);
482}
483
Howard Hinnant73d21a42010-09-04 23:28:19 +0000484#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000485
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000486template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000487 class _LIBCPP_TYPE_VIS tuple_size<pair<_T1, _T2> >
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000488 : public integral_constant<size_t, 2> {};
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000489
490template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000491 class _LIBCPP_TYPE_VIS tuple_size<const pair<_T1, _T2> >
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000492 : public integral_constant<size_t, 2> {};
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000493
494template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000495class _LIBCPP_TYPE_VIS tuple_element<0, pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000496{
497public:
498 typedef _T1 type;
499};
500
501template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000502class _LIBCPP_TYPE_VIS tuple_element<1, pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000503{
504public:
505 typedef _T2 type;
506};
507
508template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000509class _LIBCPP_TYPE_VIS tuple_element<0, const pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000510{
511public:
512 typedef const _T1 type;
513};
514
515template <class _T1, class _T2>
Howard Hinnant83eade62013-03-06 23:30:19 +0000516class _LIBCPP_TYPE_VIS tuple_element<1, const pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000517{
518public:
519 typedef const _T2 type;
520};
521
522template <size_t _Ip> struct __get_pair;
523
524template <>
525struct __get_pair<0>
526{
527 template <class _T1, class _T2>
528 static
529 _LIBCPP_INLINE_VISIBILITY
530 _T1&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000531 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000532
533 template <class _T1, class _T2>
534 static
535 _LIBCPP_INLINE_VISIBILITY
536 const _T1&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000537 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000538
539#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
540
541 template <class _T1, class _T2>
542 static
543 _LIBCPP_INLINE_VISIBILITY
544 _T1&&
Howard Hinnant0949eed2011-06-30 21:18:19 +0000545 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000546
547#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000548};
549
550template <>
551struct __get_pair<1>
552{
553 template <class _T1, class _T2>
554 static
555 _LIBCPP_INLINE_VISIBILITY
556 _T2&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000557 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000558
559 template <class _T1, class _T2>
560 static
561 _LIBCPP_INLINE_VISIBILITY
562 const _T2&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000563 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000564
565#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
566
567 template <class _T1, class _T2>
568 static
569 _LIBCPP_INLINE_VISIBILITY
570 _T2&&
Howard Hinnant0949eed2011-06-30 21:18:19 +0000571 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000572
573#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000574};
575
576template <size_t _Ip, class _T1, class _T2>
577_LIBCPP_INLINE_VISIBILITY inline
578typename tuple_element<_Ip, pair<_T1, _T2> >::type&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000579get(pair<_T1, _T2>& __p) _NOEXCEPT
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000580{
581 return __get_pair<_Ip>::get(__p);
582}
583
584template <size_t _Ip, class _T1, class _T2>
585_LIBCPP_INLINE_VISIBILITY inline
586const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000587get(const pair<_T1, _T2>& __p) _NOEXCEPT
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000588{
589 return __get_pair<_Ip>::get(__p);
590}
591
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000592#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
593
594template <size_t _Ip, class _T1, class _T2>
595_LIBCPP_INLINE_VISIBILITY inline
596typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000597get(pair<_T1, _T2>&& __p) _NOEXCEPT
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000598{
Howard Hinnant0949eed2011-06-30 21:18:19 +0000599 return __get_pair<_Ip>::get(_VSTD::move(__p));
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000600}
601
602#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
603
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000604#if _LIBCPP_STD_VER > 11
605
606template<class _Tp, _Tp... _Ip>
Marshall Clow42e55e92013-07-03 19:20:30 +0000607struct _LIBCPP_TYPE_VIS integer_sequence
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000608{
609 typedef _Tp value_type;
610 static_assert( is_integral<_Tp>::value,
611 "std::integer_sequence can only be instantiated with an integral type" );
612 static
613 _LIBCPP_INLINE_VISIBILITY
614 constexpr
615 size_t
616 size() noexcept { return sizeof...(_Ip); }
617};
618
619template<size_t... _Ip>
620 using index_sequence = integer_sequence<size_t, _Ip...>;
621
Marshall Clow42e55e92013-07-03 19:20:30 +0000622namespace __detail {
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000623
Marshall Clow42e55e92013-07-03 19:20:30 +0000624template<typename _Tp, size_t ..._Extra> struct __repeat;
625template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> {
626 typedef integer_sequence<_Tp,
627 _Np...,
628 sizeof...(_Np) + _Np...,
629 2 * sizeof...(_Np) + _Np...,
630 3 * sizeof...(_Np) + _Np...,
631 4 * sizeof...(_Np) + _Np...,
632 5 * sizeof...(_Np) + _Np...,
633 6 * sizeof...(_Np) + _Np...,
634 7 * sizeof...(_Np) + _Np...,
635 _Extra...> type;
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000636};
637
Marshall Clow42e55e92013-07-03 19:20:30 +0000638template<size_t _Np> struct __parity;
639template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
640
641template<> struct __make<0> { typedef integer_sequence<size_t> type; };
642template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; };
643template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; };
644template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; };
645template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; };
646template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
647template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
648template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
649
650template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
651template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
652template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
653template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
654template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
655template<> 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> {}; };
656template<> 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> {}; };
657template<> 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> {}; };
658
659template<typename _Tp, typename _Up> struct __convert {
660 template<typename> struct __result;
661 template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; };
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000662};
Marshall Clow42e55e92013-07-03 19:20:30 +0000663template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; };
664
665}
666
667template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
668 typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type;
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000669
670template <class _Tp, _Tp _Ep>
671struct __make_integer_sequence
672{
673 static_assert(is_integral<_Tp>::value,
674 "std::make_integer_sequence can only be instantiated with an integral type" );
675 static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative");
Marshall Clow42e55e92013-07-03 19:20:30 +0000676 typedef __make_integer_sequence_unchecked<_Tp, _Ep> type;
Marshall Clow7ec46bc2013-07-01 16:26:55 +0000677};
678
679template<class _Tp, _Tp _Np>
680 using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type;
681
682template<size_t _Np>
683 using make_index_sequence = make_integer_sequence<size_t, _Np>;
684
685template<class... _Tp>
686 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
687
688#endif // _LIBCPP_STD_VER > 11
689
Marshall Clowe2735d12013-07-08 20:54:40 +0000690#if _LIBCPP_STD_VER > 11
691template<class _T1, class _T2 = _T1>
692_LIBCPP_INLINE_VISIBILITY inline
693_T1 exchange(_T1& __obj, _T2 && __new_value)
694{
Howard Hinnant171771a2013-07-08 21:06:38 +0000695 _T1 __old_value = _VSTD::move(__obj);
696 __obj = _VSTD::forward<_T2>(__new_value);
697 return __old_value;
698}
Marshall Clowe2735d12013-07-08 20:54:40 +0000699#endif // _LIBCPP_STD_VER > 11
700
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000701_LIBCPP_END_NAMESPACE_STD
702
703#endif // _LIBCPP_UTILITY