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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
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000120} // std
121
122*/
123
124#include <__config>
125#include <__tuple>
126#include <type_traits>
127
128#pragma GCC system_header
129
130_LIBCPP_BEGIN_NAMESPACE_STD
131
132namespace rel_ops
133{
134
135template<class _Tp>
136inline _LIBCPP_INLINE_VISIBILITY
137bool
138operator!=(const _Tp& __x, const _Tp& __y)
139{
140 return !(__x == __y);
141}
142
143template<class _Tp>
144inline _LIBCPP_INLINE_VISIBILITY
145bool
146operator> (const _Tp& __x, const _Tp& __y)
147{
148 return __y < __x;
149}
150
151template<class _Tp>
152inline _LIBCPP_INLINE_VISIBILITY
153bool
154operator<=(const _Tp& __x, const _Tp& __y)
155{
156 return !(__y < __x);
157}
158
159template<class _Tp>
160inline _LIBCPP_INLINE_VISIBILITY
161bool
162operator>=(const _Tp& __x, const _Tp& __y)
163{
164 return !(__x < __y);
165}
166
167} // rel_ops
168
169// swap_ranges
170
171template <class _ForwardIterator1, class _ForwardIterator2>
172inline _LIBCPP_INLINE_VISIBILITY
173_ForwardIterator2
174swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
175{
176 for(; __first1 != __last1; ++__first1, ++__first2)
177 swap(*__first1, *__first2);
178 return __first2;
179}
180
181template<class _Tp, size_t _N>
182inline _LIBCPP_INLINE_VISIBILITY
183void
Howard Hinnanta5e01212011-05-27 19:08:18 +0000184swap(_Tp (&__a)[_N], _Tp (&__b)[_N]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000185{
Howard Hinnant0949eed2011-06-30 21:18:19 +0000186 _VSTD::swap_ranges(__a, __a + _N, __b);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000187}
188
189template <class _Tp>
190inline _LIBCPP_INLINE_VISIBILITY
Howard Hinnant73d21a42010-09-04 23:28:19 +0000191#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000192typename conditional
193<
Howard Hinnant1468b662010-11-19 22:17:28 +0000194 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000195 const _Tp&,
196 _Tp&&
197>::type
Howard Hinnant73d21a42010-09-04 23:28:19 +0000198#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000199const _Tp&
200#endif
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000201move_if_noexcept(_Tp& __x) _NOEXCEPT
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000202{
Howard Hinnant0949eed2011-06-30 21:18:19 +0000203 return _VSTD::move(__x);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000204}
205
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000206struct _LIBCPP_VISIBLE piecewise_construct_t { };
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000207//constexpr
208extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
209
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000210template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000211struct _LIBCPP_VISIBLE pair
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000212{
213 typedef _T1 first_type;
214 typedef _T2 second_type;
215
216 _T1 first;
217 _T2 second;
218
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000219 // pair(const pair&) = default;
220 // pair(pair&&) = default;
221
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000222 _LIBCPP_INLINE_VISIBILITY pair() : first(), second() {}
223
224 _LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
225 : first(__x), second(__y) {}
226
Howard Hinnant469d4192011-04-29 18:10:55 +0000227 template<class _U1, class _U2>
228 _LIBCPP_INLINE_VISIBILITY
Howard Hinnant9c59d382011-07-27 19:25:28 +0000229 pair(const pair<_U1, _U2>& __p
230#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
231 ,typename enable_if<is_constructible<_T1, _U1>::value &&
232 is_constructible<_T2, _U2>::value>::type* = 0
233#endif
234 )
Howard Hinnant469d4192011-04-29 18:10:55 +0000235 : first(__p.first), second(__p.second) {}
236
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000237 _LIBCPP_INLINE_VISIBILITY
Howard Hinnant61aa6012011-07-01 19:24:36 +0000238 pair(const pair& __p)
239 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
240 is_nothrow_copy_constructible<second_type>::value)
241 : first(__p.first),
242 second(__p.second)
243 {
244 }
245
246 _LIBCPP_INLINE_VISIBILITY
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000247 pair& operator=(const pair& __p)
Howard Hinnant61aa6012011-07-01 19:24:36 +0000248 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
249 is_nothrow_copy_assignable<second_type>::value)
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000250 {
251 first = __p.first;
252 second = __p.second;
253 return *this;
254 }
255
Howard Hinnant73d21a42010-09-04 23:28:19 +0000256#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000257
258 template <class _U1, class _U2,
Howard Hinnant74248882011-07-01 20:12:51 +0000259 class = typename enable_if<is_constructible<first_type, _U1 >::value &&
260 is_constructible<second_type, _U2>::value>::type>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000261 _LIBCPP_INLINE_VISIBILITY
262 pair(_U1&& __u1, _U2&& __u2)
Howard Hinnant0949eed2011-06-30 21:18:19 +0000263 : first(_VSTD::forward<_U1>(__u1)),
264 second(_VSTD::forward<_U2>(__u2))
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000265 {}
266
Howard Hinnant469d4192011-04-29 18:10:55 +0000267 template<class _U1, class _U2>
268 _LIBCPP_INLINE_VISIBILITY
269 pair(pair<_U1, _U2>&& __p,
Howard Hinnant74248882011-07-01 20:12:51 +0000270 typename enable_if<is_constructible<_T1, _U1>::value &&
271 is_constructible<_T2, _U2>::value>::type* = 0)
Howard Hinnant0949eed2011-06-30 21:18:19 +0000272 : first(_VSTD::forward<_U1>(__p.first)),
273 second(_VSTD::forward<_U2>(__p.second)) {}
Howard Hinnant469d4192011-04-29 18:10:55 +0000274
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000275 _LIBCPP_INLINE_VISIBILITY
Howard Hinnant61aa6012011-07-01 19:24:36 +0000276 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
277 is_nothrow_move_constructible<second_type>::value)
278 : first(_VSTD::forward<first_type>(__p.first)),
279 second(_VSTD::forward<second_type>(__p.second))
280 {
281 }
282
283 _LIBCPP_INLINE_VISIBILITY
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000284 pair&
285 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
286 is_nothrow_move_assignable<second_type>::value)
287 {
Howard Hinnant0949eed2011-06-30 21:18:19 +0000288 first = _VSTD::forward<first_type>(__p.first);
289 second = _VSTD::forward<second_type>(__p.second);
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000290 return *this;
291 }
292
Michael J. Spencer626916f2010-12-10 19:47:54 +0000293#ifndef _LIBCPP_HAS_NO_VARIADICS
294
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000295 template<class _Tuple,
296 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
297 _LIBCPP_INLINE_VISIBILITY
298 pair(_Tuple&& __p)
Howard Hinnant0949eed2011-06-30 21:18:19 +0000299 : first(_VSTD::forward<typename tuple_element<0,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000300 typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))),
Howard Hinnant0949eed2011-06-30 21:18:19 +0000301 second(_VSTD::forward<typename tuple_element<1,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000302 typename __make_tuple_types<_Tuple>::type>::type>(get<1>(__p)))
303 {}
304
Michael J. Spencer626916f2010-12-10 19:47:54 +0000305
Howard Hinnant726a76f2010-11-16 21:10:23 +0000306
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000307 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000308 _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000309 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
310 tuple<_Args2...> __second_args)
Howard Hinnant324bb032010-08-22 00:02:43 +0000311 : pair(__pc, __first_args, __second_args,
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000312 typename __make_tuple_indices<sizeof...(_Args1)>::type(),
313 typename __make_tuple_indices<sizeof...(_Args2) >::type())
314 {}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000315
316 template <class _Tuple,
317 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000318 _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000319 pair&
320 operator=(_Tuple&& __p)
321 {
322 typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
323 typedef typename tuple_element<0, _TupleRef>::type _U0;
324 typedef typename tuple_element<1, _TupleRef>::type _U1;
Howard Hinnant0949eed2011-06-30 21:18:19 +0000325 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p));
326 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p));
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000327 return *this;
328 }
329
Michael J. Spencer626916f2010-12-10 19:47:54 +0000330#endif // _LIBCPP_HAS_NO_VARIADICS
331
Howard Hinnant73d21a42010-09-04 23:28:19 +0000332#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000333 _LIBCPP_INLINE_VISIBILITY
334 void
Howard Hinnanta5e01212011-05-27 19:08:18 +0000335 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
336 __is_nothrow_swappable<second_type>::value)
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000337 {
Howard Hinnant0949eed2011-06-30 21:18:19 +0000338 _VSTD::iter_swap(&first, &__p.first);
339 _VSTD::iter_swap(&second, &__p.second);
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000340 }
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000341private:
Howard Hinnant324bb032010-08-22 00:02:43 +0000342
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000343#ifndef _LIBCPP_HAS_NO_VARIADICS
344 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
Howard Hinnant5f5859c2011-01-13 20:05:05 +0000345 _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000346 pair(piecewise_construct_t,
347 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
348 __tuple_indices<_I1...>, __tuple_indices<_I2...>);
Howard Hinnant324bb032010-08-22 00:02:43 +0000349#endif // _LIBCPP_HAS_NO_VARIADICS
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000350};
351
352template <class _T1, class _T2>
353inline _LIBCPP_INLINE_VISIBILITY
354bool
355operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
356{
357 return __x.first == __y.first && __x.second == __y.second;
358}
359
360template <class _T1, class _T2>
361inline _LIBCPP_INLINE_VISIBILITY
362bool
363operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
364{
365 return !(__x == __y);
366}
367
368template <class _T1, class _T2>
369inline _LIBCPP_INLINE_VISIBILITY
370bool
371operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
372{
373 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
374}
375
376template <class _T1, class _T2>
377inline _LIBCPP_INLINE_VISIBILITY
378bool
379operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
380{
381 return __y < __x;
382}
383
384template <class _T1, class _T2>
385inline _LIBCPP_INLINE_VISIBILITY
386bool
387operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
388{
389 return !(__x < __y);
390}
391
392template <class _T1, class _T2>
393inline _LIBCPP_INLINE_VISIBILITY
394bool
395operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
396{
397 return !(__y < __x);
398}
399
400template <class _T1, class _T2>
401inline _LIBCPP_INLINE_VISIBILITY
Howard Hinnantaabf2872011-06-01 19:59:32 +0000402typename enable_if
403<
404 __is_swappable<_T1>::value &&
405 __is_swappable<_T2>::value,
406 void
407>::type
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000408swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
Howard Hinnanta5e01212011-05-27 19:08:18 +0000409 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
410 __is_nothrow_swappable<_T2>::value))
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000411{
Howard Hinnante9b2c2d2011-05-27 15:04:19 +0000412 __x.swap(__y);
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000413}
414
Howard Hinnant73d21a42010-09-04 23:28:19 +0000415#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000416
417template <class _Tp> class reference_wrapper;
418
419template <class _Tp>
420struct ___make_pair_return
421{
422 typedef _Tp type;
423};
424
425template <class _Tp>
426struct ___make_pair_return<reference_wrapper<_Tp>>
427{
428 typedef _Tp& type;
429};
430
431template <class _Tp>
432struct __make_pair_return
433{
434 typedef typename ___make_pair_return<typename decay<_Tp>::type>::type type;
435};
436
437template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000438inline _LIBCPP_INLINE_VISIBILITY
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000439pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
440make_pair(_T1&& __t1, _T2&& __t2)
441{
442 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
Howard Hinnant0949eed2011-06-30 21:18:19 +0000443 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000444}
445
Howard Hinnant73d21a42010-09-04 23:28:19 +0000446#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000447
448template <class _T1, class _T2>
449inline _LIBCPP_INLINE_VISIBILITY
450pair<_T1,_T2>
451make_pair(_T1 __x, _T2 __y)
452{
453 return pair<_T1, _T2>(__x, __y);
454}
455
Howard Hinnant73d21a42010-09-04 23:28:19 +0000456#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000457
458#ifndef _LIBCPP_HAS_NO_VARIADICS
459
460template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000461 class _LIBCPP_VISIBLE tuple_size<pair<_T1, _T2> >
462 : public integral_constant<size_t, 2> {};
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000463
464template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000465 class _LIBCPP_VISIBLE tuple_size<const pair<_T1, _T2> >
466 : public integral_constant<size_t, 2> {};
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000467
468template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000469class _LIBCPP_VISIBLE tuple_element<0, pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000470{
471public:
472 typedef _T1 type;
473};
474
475template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000476class _LIBCPP_VISIBLE tuple_element<1, pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000477{
478public:
479 typedef _T2 type;
480};
481
482template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000483class _LIBCPP_VISIBLE tuple_element<0, const pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000484{
485public:
486 typedef const _T1 type;
487};
488
489template <class _T1, class _T2>
Howard Hinnantee6ccd02010-09-23 18:58:28 +0000490class _LIBCPP_VISIBLE tuple_element<1, const pair<_T1, _T2> >
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000491{
492public:
493 typedef const _T2 type;
494};
495
496template <size_t _Ip> struct __get_pair;
497
498template <>
499struct __get_pair<0>
500{
501 template <class _T1, class _T2>
502 static
503 _LIBCPP_INLINE_VISIBILITY
504 _T1&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000505 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000506
507 template <class _T1, class _T2>
508 static
509 _LIBCPP_INLINE_VISIBILITY
510 const _T1&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000511 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000512
513#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
514
515 template <class _T1, class _T2>
516 static
517 _LIBCPP_INLINE_VISIBILITY
518 _T1&&
Howard Hinnant0949eed2011-06-30 21:18:19 +0000519 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000520
521#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000522};
523
524template <>
525struct __get_pair<1>
526{
527 template <class _T1, class _T2>
528 static
529 _LIBCPP_INLINE_VISIBILITY
530 _T2&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000531 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000532
533 template <class _T1, class _T2>
534 static
535 _LIBCPP_INLINE_VISIBILITY
536 const _T2&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000537 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
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 _T2&&
Howard Hinnant0949eed2011-06-30 21:18:19 +0000545 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
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 <size_t _Ip, class _T1, class _T2>
551_LIBCPP_INLINE_VISIBILITY inline
552typename tuple_element<_Ip, pair<_T1, _T2> >::type&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000553get(pair<_T1, _T2>& __p) _NOEXCEPT
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000554{
555 return __get_pair<_Ip>::get(__p);
556}
557
558template <size_t _Ip, class _T1, class _T2>
559_LIBCPP_INLINE_VISIBILITY inline
560const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000561get(const pair<_T1, _T2>& __p) _NOEXCEPT
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000562{
563 return __get_pair<_Ip>::get(__p);
564}
565
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000566#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
567
568template <size_t _Ip, class _T1, class _T2>
569_LIBCPP_INLINE_VISIBILITY inline
570typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
Howard Hinnanta5e01212011-05-27 19:08:18 +0000571get(pair<_T1, _T2>&& __p) _NOEXCEPT
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000572{
Howard Hinnant0949eed2011-06-30 21:18:19 +0000573 return __get_pair<_Ip>::get(_VSTD::move(__p));
Howard Hinnantcd2254b2010-11-17 19:52:17 +0000574}
575
576#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
577
Howard Hinnant324bb032010-08-22 00:02:43 +0000578#endif // _LIBCPP_HAS_NO_VARIADICS
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000579
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000580_LIBCPP_END_NAMESPACE_STD
581
582#endif // _LIBCPP_UTILITY