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[minix.git] / external / bsd / libc++ / dist / libcxx / include / tuple
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1 // -*- C++ -*-
2 //===--------------------------- tuple ------------------------------------===//
3 //
4 //                     The LLVM Compiler Infrastructure
5 //
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
8 //
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_TUPLE
12 #define _LIBCPP_TUPLE
15     tuple synopsis
17 namespace std
20 template <class... T>
21 class tuple {
22 public:
23     constexpr tuple();
24     explicit tuple(const T&...);  // constexpr in C++14
25     template <class... U>
26         explicit tuple(U&&...);  // constexpr in C++14
27     tuple(const tuple&) = default;
28     tuple(tuple&&) = default;
29     template <class... U>
30         tuple(const tuple<U...>&);  // constexpr in C++14
31     template <class... U>
32         tuple(tuple<U...>&&);  // constexpr in C++14
33     template <class U1, class U2>
34         tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
35     template <class U1, class U2>
36         tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2  // constexpr in C++14
38     // allocator-extended constructors
39     template <class Alloc>
40         tuple(allocator_arg_t, const Alloc& a);
41     template <class Alloc>
42         tuple(allocator_arg_t, const Alloc& a, const T&...);
43     template <class Alloc, class... U>
44         tuple(allocator_arg_t, const Alloc& a, U&&...);
45     template <class Alloc>
46         tuple(allocator_arg_t, const Alloc& a, const tuple&);
47     template <class Alloc>
48         tuple(allocator_arg_t, const Alloc& a, tuple&&);
49     template <class Alloc, class... U>
50         tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&);
51     template <class Alloc, class... U>
52         tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&);
53     template <class Alloc, class U1, class U2>
54         tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&);
55     template <class Alloc, class U1, class U2>
56         tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&);
58     tuple& operator=(const tuple&);
59     tuple&
60         operator=(tuple&&) noexcept(AND(is_nothrow_move_assignable<T>::value ...));
61     template <class... U>
62         tuple& operator=(const tuple<U...>&);
63     template <class... U>
64         tuple& operator=(tuple<U...>&&);
65     template <class U1, class U2>
66         tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2
67     template <class U1, class U2>
68         tuple& operator=(pair<U1, U2>&&); //iffsizeof...(T) == 2
70     void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...));
73 const unspecified ignore;
75 template <class... T> tuple<V...>  make_tuple(T&&...); // constexpr in C++14
76 template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
77 template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
78 template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
79   
80 // 20.4.1.4, tuple helper classes:
81 template <class T> class tuple_size; // undefined
82 template <class... T> class tuple_size<tuple<T...>>;
83 template <intsize_t I, class T> class tuple_element; // undefined
84 template <intsize_t I, class... T> class tuple_element<I, tuple<T...>>;
85 template <size_t _Ip, class ..._Tp>
86   using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type; // C++14
88 // 20.4.1.5, element access:
89 template <intsize_t I, class... T>
90     typename tuple_element<I, tuple<T...>>::type&
91     get(tuple<T...>&) noexcept; // constexpr in C++14
92 template <intsize_t I, class... T>
93     typename const tuple_element<I, tuple<T...>>::type &
94     get(const tuple<T...>&) noexcept; // constexpr in C++14
95 template <intsize_t I, class... T>
96     typename tuple_element<I, tuple<T...>>::type&&
97     get(tuple<T...>&&) noexcept; // constexpr in C++14
99 template <class T1, class... T>
100     constexpr T1& get(tuple<T...>&) noexcept;  // C++14
101 template <class T1, class... T>
102     constexpr T1 const& get(const tuple<T...>&) noexcept;   // C++14
103 template <class T1, class... T>
104     constexpr T1&& get(tuple<T...>&&) noexcept;   // C++14
106 // 20.4.1.6, relational operators:
107 template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
108 template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&);  // constexpr in C++14
109 template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
110 template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&);  // constexpr in C++14
111 template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
112 template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
114 template <class... Types, class Alloc>
115   struct uses_allocator<tuple<Types...>, Alloc>;
117 template <class... Types>
118   void
119   swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y)));
121 }  // std
125 #include <__config>
126 #include <__tuple>
127 #include <cstddef>
128 #include <type_traits>
129 #include <__functional_base>
130 #include <utility>
132 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
133 #pragma GCC system_header
134 #endif
136 _LIBCPP_BEGIN_NAMESPACE_STD
138 #ifndef _LIBCPP_HAS_NO_VARIADICS
140 // tuple_size
142 template <class ..._Tp>
143 class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> >
144     : public integral_constant<size_t, sizeof...(_Tp)>
148 // tuple_element
150 template <size_t _Ip, class ..._Tp>
151 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, tuple<_Tp...> >
153 public:
154     typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
157 #if _LIBCPP_STD_VER > 11
158 template <size_t _Ip, class ..._Tp>
159 using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
160 #endif
162 // __tuple_leaf
164 template <size_t _Ip, class _Hp,
165           bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value
166          >
167 class __tuple_leaf;
169 template <size_t _Ip, class _Hp, bool _Ep>
170 inline _LIBCPP_INLINE_VISIBILITY
171 void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y)
172     _NOEXCEPT_(__is_nothrow_swappable<_Hp>::value)
174     swap(__x.get(), __y.get());
177 template <size_t _Ip, class _Hp, bool>
178 class __tuple_leaf
180     _Hp value;
182     __tuple_leaf& operator=(const __tuple_leaf&);
183 public:
184     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf()
185              _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : value()
186        {static_assert(!is_reference<_Hp>::value,
187               "Attempted to default construct a reference element in a tuple");}
189     template <class _Alloc>
190         _LIBCPP_INLINE_VISIBILITY
191         __tuple_leaf(integral_constant<int, 0>, const _Alloc&)
192             : value()
193         {static_assert(!is_reference<_Hp>::value,
194               "Attempted to default construct a reference element in a tuple");}
196     template <class _Alloc>
197         _LIBCPP_INLINE_VISIBILITY
198         __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
199             : value(allocator_arg_t(), __a)
200         {static_assert(!is_reference<_Hp>::value,
201               "Attempted to default construct a reference element in a tuple");}
203     template <class _Alloc>
204         _LIBCPP_INLINE_VISIBILITY
205         __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a)
206             : value(__a)
207         {static_assert(!is_reference<_Hp>::value,
208               "Attempted to default construct a reference element in a tuple");}
210     template <class _Tp,
211               class = typename enable_if<
212                   __lazy_and<
213                       __lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>>
214                     , is_constructible<_Hp, _Tp>
215                     >::value
216                 >::type
217             >
218         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
219         explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
220             : value(_VSTD::forward<_Tp>(__t))
221         {static_assert(!is_reference<_Hp>::value ||
222                        (is_lvalue_reference<_Hp>::value &&
223                         (is_lvalue_reference<_Tp>::value ||
224                          is_same<typename remove_reference<_Tp>::type,
225                                  reference_wrapper<
226                                     typename remove_reference<_Hp>::type
227                                  >
228                                 >::value)) ||
229                         (is_rvalue_reference<_Hp>::value &&
230                          !is_lvalue_reference<_Tp>::value),
231        "Attempted to construct a reference element in a tuple with an rvalue");}
233     template <class _Tp, class _Alloc>
234         _LIBCPP_INLINE_VISIBILITY
235         explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
236             : value(_VSTD::forward<_Tp>(__t))
237         {static_assert(!is_lvalue_reference<_Hp>::value ||
238                        (is_lvalue_reference<_Hp>::value &&
239                         (is_lvalue_reference<_Tp>::value ||
240                          is_same<typename remove_reference<_Tp>::type,
241                                  reference_wrapper<
242                                     typename remove_reference<_Hp>::type
243                                  >
244                                 >::value)),
245        "Attempted to construct a reference element in a tuple with an rvalue");}
247     template <class _Tp, class _Alloc>
248         _LIBCPP_INLINE_VISIBILITY
249         explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
250             : value(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t))
251         {static_assert(!is_lvalue_reference<_Hp>::value ||
252                        (is_lvalue_reference<_Hp>::value &&
253                         (is_lvalue_reference<_Tp>::value ||
254                          is_same<typename remove_reference<_Tp>::type,
255                                  reference_wrapper<
256                                     typename remove_reference<_Hp>::type
257                                  >
258                                 >::value)),
259        "Attempted to construct a reference element in a tuple with an rvalue");}
261     template <class _Tp, class _Alloc>
262         _LIBCPP_INLINE_VISIBILITY
263         explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
264             : value(_VSTD::forward<_Tp>(__t), __a)
265         {static_assert(!is_lvalue_reference<_Hp>::value ||
266                        (is_lvalue_reference<_Hp>::value &&
267                         (is_lvalue_reference<_Tp>::value ||
268                          is_same<typename remove_reference<_Tp>::type,
269                                  reference_wrapper<
270                                     typename remove_reference<_Hp>::type
271                                  >
272                                 >::value)),
273        "Attempted to construct a reference element in a tuple with an rvalue");}
275     __tuple_leaf(const __tuple_leaf& __t) = default;
276     __tuple_leaf(__tuple_leaf&& __t) = default;
278     template <class _Tp>
279         _LIBCPP_INLINE_VISIBILITY
280         __tuple_leaf&
281         operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value))
282         {
283             value = _VSTD::forward<_Tp>(__t);
284             return *this;
285         }
287     _LIBCPP_INLINE_VISIBILITY
288     int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value)
289     {
290         _VSTD::swap(*this, __t);
291         return 0;
292     }
294     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11       _Hp& get()       _NOEXCEPT {return value;}
295     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return value;}
298 template <size_t _Ip, class _Hp>
299 class __tuple_leaf<_Ip, _Hp, true>
300     : private _Hp
303     __tuple_leaf& operator=(const __tuple_leaf&);
304 public:
305     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf()
306              _NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {}
308     template <class _Alloc>
309         _LIBCPP_INLINE_VISIBILITY
310         __tuple_leaf(integral_constant<int, 0>, const _Alloc&) {}
312     template <class _Alloc>
313         _LIBCPP_INLINE_VISIBILITY
314         __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
315             : _Hp(allocator_arg_t(), __a) {}
317     template <class _Alloc>
318         _LIBCPP_INLINE_VISIBILITY
319         __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a)
320             : _Hp(__a) {}
322     template <class _Tp,
323               class = typename enable_if<
324                   __lazy_and<
325                         __lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>>
326                       , is_constructible<_Hp, _Tp>
327                     >::value
328                 >::type
329             >
330         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
331         explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
332             : _Hp(_VSTD::forward<_Tp>(__t)) {}
334     template <class _Tp, class _Alloc>
335         _LIBCPP_INLINE_VISIBILITY
336         explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
337             : _Hp(_VSTD::forward<_Tp>(__t)) {}
339     template <class _Tp, class _Alloc>
340         _LIBCPP_INLINE_VISIBILITY
341         explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
342             : _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {}
344     template <class _Tp, class _Alloc>
345         _LIBCPP_INLINE_VISIBILITY
346         explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
347             : _Hp(_VSTD::forward<_Tp>(__t), __a) {}
349     __tuple_leaf(__tuple_leaf const &) = default;
350     __tuple_leaf(__tuple_leaf &&) = default;
352     template <class _Tp>
353         _LIBCPP_INLINE_VISIBILITY
354         __tuple_leaf&
355         operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value))
356         {
357             _Hp::operator=(_VSTD::forward<_Tp>(__t));
358             return *this;
359         }
361     _LIBCPP_INLINE_VISIBILITY
362     int
363     swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value)
364     {
365         _VSTD::swap(*this, __t);
366         return 0;
367     }
369     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11       _Hp& get()       _NOEXCEPT {return static_cast<_Hp&>(*this);}
370     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);}
373 template <class ..._Tp>
374 _LIBCPP_INLINE_VISIBILITY
375 void __swallow(_Tp&&...) _NOEXCEPT {}
377 template <bool ..._Pred>
378 struct __all
379     : is_same<__all<_Pred...>, __all<(_Pred, true)...>>
380 { };
382 template <class _Tp>
383 struct __all_default_constructible;
385 template <class ..._Tp>
386 struct __all_default_constructible<__tuple_types<_Tp...>>
387     : __all<is_default_constructible<_Tp>::value...>
388 { };
390 // __tuple_impl
392 template<class _Indx, class ..._Tp> struct __tuple_impl;
394 template<size_t ..._Indx, class ..._Tp>
395 struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
396     : public __tuple_leaf<_Indx, _Tp>...
398     _LIBCPP_INLINE_VISIBILITY
399     _LIBCPP_CONSTEXPR __tuple_impl()
400         _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
402     template <size_t ..._Uf, class ..._Tf,
403               size_t ..._Ul, class ..._Tl, class ..._Up>
404         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
405         explicit
406         __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>,
407                      __tuple_indices<_Ul...>, __tuple_types<_Tl...>,
408                      _Up&&... __u)
409                      _NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
410                                  __all<is_nothrow_default_constructible<_Tl>::value...>::value)) :
411             __tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))...,
412             __tuple_leaf<_Ul, _Tl>()...
413             {}
415     template <class _Alloc, size_t ..._Uf, class ..._Tf,
416               size_t ..._Ul, class ..._Tl, class ..._Up>
417         _LIBCPP_INLINE_VISIBILITY
418         explicit
419         __tuple_impl(allocator_arg_t, const _Alloc& __a,
420                      __tuple_indices<_Uf...>, __tuple_types<_Tf...>,
421                      __tuple_indices<_Ul...>, __tuple_types<_Tl...>,
422                      _Up&&... __u) :
423             __tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a,
424             _VSTD::forward<_Up>(__u))...,
425             __tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)...
426             {}
428     template <class _Tuple,
429               class = typename enable_if
430                       <
431                          __tuple_constructible<_Tuple, tuple<_Tp...> >::value
432                       >::type
433              >
434         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
435         __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx,
436                                        typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
437             : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx,
438                                        typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...
439             {}
441     template <class _Alloc, class _Tuple,
442               class = typename enable_if
443                       <
444                          __tuple_convertible<_Tuple, tuple<_Tp...> >::value
445                       >::type
446              >
447         _LIBCPP_INLINE_VISIBILITY
448         __tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
449             : __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx,
450                                        typename __make_tuple_types<_Tuple>::type>::type>(), __a,
451                                        _VSTD::forward<typename tuple_element<_Indx,
452                                        typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...
453             {}
455     template <class _Tuple>
456         _LIBCPP_INLINE_VISIBILITY
457         typename enable_if
458         <
459             __tuple_assignable<_Tuple, tuple<_Tp...> >::value,
460             __tuple_impl&
461         >::type
462         operator=(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_assignable<_Tp&, typename tuple_element<_Indx,
463                                        typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
464         {
465             __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<typename tuple_element<_Indx,
466                                        typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...);
467             return *this;
468         }
470     __tuple_impl(const __tuple_impl&) = default;
471     __tuple_impl(__tuple_impl&&) = default;
473     _LIBCPP_INLINE_VISIBILITY
474     __tuple_impl&
475     operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
476     {
477         __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
478         return *this;
479     }
481     _LIBCPP_INLINE_VISIBILITY
482     __tuple_impl&
483     operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value))
484     {
485         __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...);
486         return *this;
487     }
489     _LIBCPP_INLINE_VISIBILITY
490     void swap(__tuple_impl& __t)
491         _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
492     {
493         __swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...);
494     }
497 template <class ..._Tp>
498 class _LIBCPP_TYPE_VIS_ONLY tuple
500     typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> base;
502     base base_;
504     template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
505         typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
506     template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
507         const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT;
508     template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
509         typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT;
510 public:
512     template <bool _Dummy = true, class = typename enable_if<
513         __all<__dependent_type<is_default_constructible<_Tp>, _Dummy>::value...>::value
514     >::type>
515     _LIBCPP_INLINE_VISIBILITY
516     _LIBCPP_CONSTEXPR tuple()
517         _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
519     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
520     explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 
521         : base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
522                 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
523                 typename __make_tuple_indices<0>::type(),
524                 typename __make_tuple_types<tuple, 0>::type(),
525                 __t...
526                ) {}
528     template <class _Alloc>
529       _LIBCPP_INLINE_VISIBILITY
530       tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
531         : base_(allocator_arg_t(), __a,
532                 typename __make_tuple_indices<sizeof...(_Tp)>::type(),
533                 typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
534                 typename __make_tuple_indices<0>::type(),
535                 typename __make_tuple_types<tuple, 0>::type(),
536                 __t...
537                ) {}
539     template <class ..._Up,
540               typename enable_if
541                       <
542                          sizeof...(_Up) <= sizeof...(_Tp) &&
543                          __tuple_convertible
544                          <
545                             tuple<_Up...>,
546                             typename __make_tuple_types<tuple,
547                                      sizeof...(_Up) < sizeof...(_Tp) ?
548                                         sizeof...(_Up) :
549                                         sizeof...(_Tp)>::type
550                          >::value &&
551                          __all_default_constructible<
552                             typename __make_tuple_types<tuple, sizeof...(_Tp),
553                                 sizeof...(_Up) < sizeof...(_Tp) ?
554                                     sizeof...(_Up) :
555                                     sizeof...(_Tp)>::type
556                          >::value,
557                          bool
558                       >::type = false
559              >
560         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
561         tuple(_Up&&... __u)
562             _NOEXCEPT_((
563                 is_nothrow_constructible<base,
564                     typename __make_tuple_indices<sizeof...(_Up)>::type,
565                     typename __make_tuple_types<tuple, sizeof...(_Up)>::type,
566                     typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type,
567                     typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type,
568                     _Up...
569                 >::value
570             ))
571             : base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
572                     typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
573                     typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
574                     typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
575                     _VSTD::forward<_Up>(__u)...) {}
577     template <class ..._Up,
578               typename enable_if
579                       <
580                          sizeof...(_Up) <= sizeof...(_Tp) &&
581                          __tuple_constructible
582                          <
583                             tuple<_Up...>,
584                             typename __make_tuple_types<tuple,
585                                      sizeof...(_Up) < sizeof...(_Tp) ?
586                                         sizeof...(_Up) :
587                                         sizeof...(_Tp)>::type
588                          >::value &&
589                          !__tuple_convertible
590                          <
591                             tuple<_Up...>,
592                             typename __make_tuple_types<tuple,
593                                      sizeof...(_Up) < sizeof...(_Tp) ?
594                                         sizeof...(_Up) :
595                                         sizeof...(_Tp)>::type
596                          >::value &&
597                          __all_default_constructible<
598                             typename __make_tuple_types<tuple, sizeof...(_Tp),
599                                 sizeof...(_Up) < sizeof...(_Tp) ?
600                                     sizeof...(_Up) :
601                                     sizeof...(_Tp)>::type
602                          >::value,
603                          bool
604                       >::type =false
605              >
606         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
607         explicit
608         tuple(_Up&&... __u)
609             _NOEXCEPT_((
610                 is_nothrow_constructible<base,
611                     typename __make_tuple_indices<sizeof...(_Up)>::type,
612                     typename __make_tuple_types<tuple, sizeof...(_Up)>::type,
613                     typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type,
614                     typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type,
615                     _Up...
616                 >::value
617             ))
618             : base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
619                     typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
620                     typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
621                     typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
622                     _VSTD::forward<_Up>(__u)...) {}
624     template <class _Alloc, class ..._Up,
625               class = typename enable_if
626                       <
627                          sizeof...(_Up) <= sizeof...(_Tp) &&
628                          __tuple_convertible
629                          <
630                             tuple<_Up...>,
631                             typename __make_tuple_types<tuple,
632                                      sizeof...(_Up) < sizeof...(_Tp) ?
633                                         sizeof...(_Up) :
634                                         sizeof...(_Tp)>::type
635                          >::value &&
636                          __all_default_constructible<
637                             typename __make_tuple_types<tuple, sizeof...(_Tp),
638                                 sizeof...(_Up) < sizeof...(_Tp) ?
639                                     sizeof...(_Up) :
640                                     sizeof...(_Tp)>::type
641                          >::value
642                       >::type
643              >
644         _LIBCPP_INLINE_VISIBILITY
645         tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
646             : base_(allocator_arg_t(), __a,
647                     typename __make_tuple_indices<sizeof...(_Up)>::type(),
648                     typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
649                     typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
650                     typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
651                     _VSTD::forward<_Up>(__u)...) {}
653     template <class _Tuple,
654               typename enable_if
655                       <
656                          __tuple_convertible<_Tuple, tuple>::value,
657                          bool
658                       >::type = false
659              >
660         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
661         tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
662             : base_(_VSTD::forward<_Tuple>(__t)) {}
664     template <class _Tuple,
665               typename enable_if
666                       <
667                          __tuple_constructible<_Tuple, tuple>::value &&
668                          !__tuple_convertible<_Tuple, tuple>::value,
669                          bool
670                       >::type = false
671              >
672         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
673         explicit
674         tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
675             : base_(_VSTD::forward<_Tuple>(__t)) {}
677     template <class _Alloc, class _Tuple,
678               class = typename enable_if
679                       <
680                          __tuple_convertible<_Tuple, tuple>::value
681                       >::type
682              >
683         _LIBCPP_INLINE_VISIBILITY
684         tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
685             : base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
687     template <class _Tuple,
688               class = typename enable_if
689                       <
690                          __tuple_assignable<_Tuple, tuple>::value
691                       >::type
692              >
693         _LIBCPP_INLINE_VISIBILITY
694         tuple&
695         operator=(_Tuple&& __t) _NOEXCEPT_((is_nothrow_assignable<base&, _Tuple>::value))
696         {
697             base_.operator=(_VSTD::forward<_Tuple>(__t));
698             return *this;
699         }
701     _LIBCPP_INLINE_VISIBILITY
702     void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
703         {base_.swap(__t.base_);}
706 template <>
707 class _LIBCPP_TYPE_VIS_ONLY tuple<>
709 public:
710     _LIBCPP_INLINE_VISIBILITY
711     _LIBCPP_CONSTEXPR tuple() _NOEXCEPT {}
712     template <class _Alloc>
713     _LIBCPP_INLINE_VISIBILITY
714         tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
715     template <class _Alloc>
716     _LIBCPP_INLINE_VISIBILITY
717         tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {}
718     template <class _Up>
719     _LIBCPP_INLINE_VISIBILITY
720         tuple(array<_Up, 0>) _NOEXCEPT {}
721     template <class _Alloc, class _Up>
722     _LIBCPP_INLINE_VISIBILITY
723         tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
724     _LIBCPP_INLINE_VISIBILITY
725     void swap(tuple&) _NOEXCEPT {}
728 template <class ..._Tp>
729 inline _LIBCPP_INLINE_VISIBILITY
730 typename enable_if
732     __all<__is_swappable<_Tp>::value...>::value,
733     void
734 >::type
735 swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u)
736                  _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
737     {__t.swap(__u);}
739 // get
741 template <size_t _Ip, class ..._Tp>
742 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
743 typename tuple_element<_Ip, tuple<_Tp...> >::type&
744 get(tuple<_Tp...>& __t) _NOEXCEPT
746     typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
747     return static_cast<__tuple_leaf<_Ip, type>&>(__t.base_).get();
750 template <size_t _Ip, class ..._Tp>
751 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
752 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
753 get(const tuple<_Tp...>& __t) _NOEXCEPT
755     typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
756     return static_cast<const __tuple_leaf<_Ip, type>&>(__t.base_).get();
759 template <size_t _Ip, class ..._Tp>
760 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
761 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
762 get(tuple<_Tp...>&& __t) _NOEXCEPT
764     typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
765     return static_cast<type&&>(
766              static_cast<__tuple_leaf<_Ip, type>&&>(__t.base_).get());
769 #if _LIBCPP_STD_VER > 11
770 // get by type
771 template <typename _T1, size_t _Idx, typename... _Args>
772 struct __find_exactly_one_t_helper;
774 // -- find exactly one
775 template <typename _T1, size_t _Idx, typename... _Args>
776 struct __find_exactly_one_t_checker {
777     static constexpr size_t value = _Idx;
778 //  Check the rest of the list to make sure there's only one
779     static_assert ( __find_exactly_one_t_helper<_T1, 0, _Args...>::value == -1, "type can only occur once in type list" );
780     };
783 template <typename _T1, size_t _Idx>
784 struct __find_exactly_one_t_helper <_T1, _Idx> {
785     static constexpr size_t value = -1;
786     };
788 template <typename _T1, size_t _Idx, typename _Head, typename... _Args>
789 struct __find_exactly_one_t_helper <_T1, _Idx, _Head, _Args...> {
790     static constexpr size_t value =
791         std::conditional<
792             std::is_same<_T1, _Head>::value,
793             __find_exactly_one_t_checker<_T1, _Idx,   _Args...>,
794             __find_exactly_one_t_helper <_T1, _Idx+1, _Args...>
795         >::type::value;
796     };
798 template <typename _T1, typename... _Args>
799 struct __find_exactly_one_t {
800     static constexpr size_t value = __find_exactly_one_t_helper<_T1, 0, _Args...>::value;
801     static_assert ( value != -1, "type not found in type list" );
802     };
804 template <class _T1, class... _Args>
805 inline _LIBCPP_INLINE_VISIBILITY
806 constexpr _T1& get(tuple<_Args...>& __tup) noexcept
808     return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
811 template <class _T1, class... _Args>
812 inline _LIBCPP_INLINE_VISIBILITY
813 constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept
815     return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
818 template <class _T1, class... _Args>
819 inline _LIBCPP_INLINE_VISIBILITY
820 constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept
822     return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
825 #endif
827 // tie
829 template <class ..._Tp>
830 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
831 tuple<_Tp&...>
832 tie(_Tp&... __t) _NOEXCEPT
834     return tuple<_Tp&...>(__t...);
837 template <class _Up>
838 struct __ignore_t
840     template <class _Tp>
841         _LIBCPP_INLINE_VISIBILITY
842         const __ignore_t& operator=(_Tp&&) const {return *this;}
845 namespace { const __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); }
847 template <class _Tp>
848 struct __make_tuple_return_impl
850     typedef _Tp type;
853 template <class _Tp>
854 struct __make_tuple_return_impl<reference_wrapper<_Tp> >
856     typedef _Tp& type;
859 template <class _Tp>
860 struct __make_tuple_return
862     typedef typename __make_tuple_return_impl<typename decay<_Tp>::type>::type type;
865 template <class... _Tp>
866 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
867 tuple<typename __make_tuple_return<_Tp>::type...>
868 make_tuple(_Tp&&... __t)
870     return tuple<typename __make_tuple_return<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...);
873 template <class... _Tp>
874 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
875 tuple<_Tp&&...>
876 forward_as_tuple(_Tp&&... __t) _NOEXCEPT
878     return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...);
881 template <size_t _Ip>
882 struct __tuple_equal
884     template <class _Tp, class _Up>
885     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
886     bool operator()(const _Tp& __x, const _Up& __y)
887     {
888         return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y);
889     }
892 template <>
893 struct __tuple_equal<0>
895     template <class _Tp, class _Up>
896     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
897     bool operator()(const _Tp&, const _Up&)
898     {
899         return true;
900     }
903 template <class ..._Tp, class ..._Up>
904 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
905 bool
906 operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
908     return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
911 template <class ..._Tp, class ..._Up>
912 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
913 bool
914 operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
916     return !(__x == __y);
919 template <size_t _Ip>
920 struct __tuple_less
922     template <class _Tp, class _Up>
923     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
924     bool operator()(const _Tp& __x, const _Up& __y)
925     {
926         const size_t __idx = tuple_size<_Tp>::value - _Ip;
927         if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y))
928             return true;
929         if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x))
930             return false;
931         return __tuple_less<_Ip-1>()(__x, __y);
932     }
935 template <>
936 struct __tuple_less<0>
938     template <class _Tp, class _Up>
939     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
940     bool operator()(const _Tp&, const _Up&)
941     {
942         return false;
943     }
946 template <class ..._Tp, class ..._Up>
947 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
948 bool
949 operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
951     return __tuple_less<sizeof...(_Tp)>()(__x, __y);
954 template <class ..._Tp, class ..._Up>
955 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
956 bool
957 operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
959     return __y < __x;
962 template <class ..._Tp, class ..._Up>
963 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
964 bool
965 operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
967     return !(__x < __y);
970 template <class ..._Tp, class ..._Up>
971 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
972 bool
973 operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
975     return !(__y < __x);
978 // tuple_cat
980 template <class _Tp, class _Up> struct __tuple_cat_type;
982 template <class ..._Ttypes, class ..._Utypes>
983 struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> >
985     typedef tuple<_Ttypes..., _Utypes...> type;
988 template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples>
989 struct __tuple_cat_return_1
993 template <class ..._Types, class _Tuple0>
994 struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0>
996     typedef typename __tuple_cat_type<tuple<_Types...>,
997             typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type>::type
998                                                                            type;
1001 template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples>
1002 struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...>
1003     : public __tuple_cat_return_1<
1004                  typename __tuple_cat_type<
1005                      tuple<_Types...>,
1006                      typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type
1007                  >::type,
1008                  __tuple_like<typename remove_reference<_Tuple1>::type>::value,
1009                  _Tuple1, _Tuples...>
1013 template <class ..._Tuples> struct __tuple_cat_return;
1015 template <class _Tuple0, class ..._Tuples>
1016 struct __tuple_cat_return<_Tuple0, _Tuples...>
1017     : public __tuple_cat_return_1<tuple<>,
1018          __tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0,
1019                                                                      _Tuples...>
1023 template <>
1024 struct __tuple_cat_return<>
1026     typedef tuple<> type;
1029 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1030 tuple<>
1031 tuple_cat()
1033     return tuple<>();
1036 template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples>
1037 struct __tuple_cat_return_ref_imp;
1039 template <class ..._Types, size_t ..._I0, class _Tuple0>
1040 struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0>
1042     typedef typename remove_reference<_Tuple0>::type _T0;
1043     typedef tuple<_Types..., typename __apply_cv<_Tuple0,
1044                           typename tuple_element<_I0, _T0>::type>::type&&...> type;
1047 template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples>
1048 struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>,
1049                                   _Tuple0, _Tuple1, _Tuples...>
1050     : public __tuple_cat_return_ref_imp<
1051          tuple<_Types..., typename __apply_cv<_Tuple0,
1052                typename tuple_element<_I0,
1053                   typename remove_reference<_Tuple0>::type>::type>::type&&...>,
1054          typename __make_tuple_indices<tuple_size<typename
1055                                  remove_reference<_Tuple1>::type>::value>::type,
1056          _Tuple1, _Tuples...>
1060 template <class _Tuple0, class ..._Tuples>
1061 struct __tuple_cat_return_ref
1062     : public __tuple_cat_return_ref_imp<tuple<>,
1063                typename __make_tuple_indices<
1064                         tuple_size<typename remove_reference<_Tuple0>::type>::value
1065                >::type, _Tuple0, _Tuples...>
1069 template <class _Types, class _I0, class _J0>
1070 struct __tuple_cat;
1072 template <class ..._Types, size_t ..._I0, size_t ..._J0>
1073 struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> >
1075     template <class _Tuple0>
1076     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1077     typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
1078     operator()(tuple<_Types...> __t, _Tuple0&& __t0)
1079     {
1080         return forward_as_tuple(_VSTD::forward<_Types>(_VSTD::get<_I0>(__t))...,
1081                                       _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...);
1082     }
1084     template <class _Tuple0, class _Tuple1, class ..._Tuples>
1085     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1086     typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
1087     operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls)
1088     {
1089         typedef typename remove_reference<_Tuple0>::type _T0;
1090         typedef typename remove_reference<_Tuple1>::type _T1;
1091         return __tuple_cat<
1092            tuple<_Types..., typename __apply_cv<_Tuple0, typename tuple_element<_J0, _T0>::type>::type&&...>,
1093            typename __make_tuple_indices<sizeof ...(_Types) + tuple_size<_T0>::value>::type,
1094            typename __make_tuple_indices<tuple_size<_T1>::value>::type>()
1095                            (forward_as_tuple(
1096                               _VSTD::forward<_Types>(_VSTD::get<_I0>(__t))...,
1097                               _VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...
1098                             ),
1099                             _VSTD::forward<_Tuple1>(__t1),
1100                             _VSTD::forward<_Tuples>(__tpls)...);
1101     }
1104 template <class _Tuple0, class... _Tuples>
1105 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
1106 typename __tuple_cat_return<_Tuple0, _Tuples...>::type
1107 tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls)
1109     typedef typename remove_reference<_Tuple0>::type _T0;
1110     return __tuple_cat<tuple<>, __tuple_indices<>,
1111                   typename __make_tuple_indices<tuple_size<_T0>::value>::type>()
1112                   (tuple<>(), _VSTD::forward<_Tuple0>(__t0),
1113                                             _VSTD::forward<_Tuples>(__tpls)...);
1116 template <class ..._Tp, class _Alloc>
1117 struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<tuple<_Tp...>, _Alloc>
1118     : true_type {};
1120 template <class _T1, class _T2>
1121 template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2>
1122 inline _LIBCPP_INLINE_VISIBILITY
1123 pair<_T1, _T2>::pair(piecewise_construct_t,
1124                      tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
1125                      __tuple_indices<_I1...>, __tuple_indices<_I2...>)
1126     :  first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...),
1127       second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...)
1131 #endif  // _LIBCPP_HAS_NO_VARIADICS
1133 _LIBCPP_END_NAMESPACE_STD
1135 #endif  // _LIBCPP_TUPLE