2 //===----------------------------------------------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP___TUPLE
12 #define _LIBCPP___TUPLE
16 #include <type_traits>
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 #pragma GCC system_header
22 #ifdef _LIBCPP_HAS_NO_VARIADICS
26 #else // _LIBCPP_HAS_NO_VARIADICS
28 _LIBCPP_BEGIN_NAMESPACE_STD
30 template <class _Tp> class _LIBCPP_TYPE_VIS tuple_size;
33 class _LIBCPP_TYPE_VIS tuple_size<const _Tp>
34 : public tuple_size<_Tp> {};
37 class _LIBCPP_TYPE_VIS tuple_size<volatile _Tp>
38 : public tuple_size<_Tp> {};
41 class _LIBCPP_TYPE_VIS tuple_size<const volatile _Tp>
42 : public tuple_size<_Tp> {};
44 template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS tuple_element;
46 template <size_t _Ip, class _Tp>
47 class _LIBCPP_TYPE_VIS tuple_element<_Ip, const _Tp>
50 typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
53 template <size_t _Ip, class _Tp>
54 class _LIBCPP_TYPE_VIS tuple_element<_Ip, volatile _Tp>
57 typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
60 template <size_t _Ip, class _Tp>
61 class _LIBCPP_TYPE_VIS tuple_element<_Ip, const volatile _Tp>
64 typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
67 template <class ..._Tp> class _LIBCPP_TYPE_VIS tuple;
68 template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS pair;
69 template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS array;
71 template <class _Tp> struct __tuple_like : false_type {};
73 template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
74 template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
75 template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
77 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
78 template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
79 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
81 template <size_t _Ip, class ..._Tp>
82 _LIBCPP_INLINE_VISIBILITY
83 typename tuple_element<_Ip, tuple<_Tp...> >::type&
84 get(tuple<_Tp...>&) _NOEXCEPT;
86 template <size_t _Ip, class ..._Tp>
87 _LIBCPP_INLINE_VISIBILITY
88 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
89 get(const tuple<_Tp...>&) _NOEXCEPT;
91 template <size_t _Ip, class ..._Tp>
92 _LIBCPP_INLINE_VISIBILITY
93 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
94 get(tuple<_Tp...>&&) _NOEXCEPT;
96 template <size_t _Ip, class _T1, class _T2>
97 _LIBCPP_INLINE_VISIBILITY
98 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
99 get(pair<_T1, _T2>&) _NOEXCEPT;
101 template <size_t _Ip, class _T1, class _T2>
102 _LIBCPP_INLINE_VISIBILITY
103 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
104 get(const pair<_T1, _T2>&) _NOEXCEPT;
106 template <size_t _Ip, class _T1, class _T2>
107 _LIBCPP_INLINE_VISIBILITY
108 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
109 get(pair<_T1, _T2>&&) _NOEXCEPT;
111 template <size_t _Ip, class _Tp, size_t _Size>
112 _LIBCPP_INLINE_VISIBILITY
114 get(array<_Tp, _Size>&) _NOEXCEPT;
116 template <size_t _Ip, class _Tp, size_t _Size>
117 _LIBCPP_INLINE_VISIBILITY
119 get(const array<_Tp, _Size>&) _NOEXCEPT;
121 template <size_t _Ip, class _Tp, size_t _Size>
122 _LIBCPP_INLINE_VISIBILITY
124 get(array<_Tp, _Size>&&) _NOEXCEPT;
126 // __make_tuple_indices
128 template <size_t...> struct __tuple_indices {};
130 template <size_t _Sp, class _IntTuple, size_t _Ep>
131 struct __make_indices_imp;
133 template <size_t _Sp, size_t ..._Indices, size_t _Ep>
134 struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
136 typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
139 template <size_t _Ep, size_t ..._Indices>
140 struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
142 typedef __tuple_indices<_Indices...> type;
145 template <size_t _Ep, size_t _Sp = 0>
146 struct __make_tuple_indices
148 static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
149 typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
154 template <class ..._Tp> struct __tuple_types {};
156 template <size_t _Ip>
157 class _LIBCPP_TYPE_VIS tuple_element<_Ip, __tuple_types<> >
160 static_assert(_Ip == 0, "tuple_element index out of range");
161 static_assert(_Ip != 0, "tuple_element index out of range");
164 template <class _Hp, class ..._Tp>
165 class _LIBCPP_TYPE_VIS tuple_element<0, __tuple_types<_Hp, _Tp...> >
171 template <size_t _Ip, class _Hp, class ..._Tp>
172 class _LIBCPP_TYPE_VIS tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
175 typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
178 template <class ..._Tp>
179 class _LIBCPP_TYPE_VIS tuple_size<__tuple_types<_Tp...> >
180 : public integral_constant<size_t, sizeof...(_Tp)>
184 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
186 // __make_tuple_types
188 // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
189 // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
190 // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
191 // lvalue_reference type, then __tuple_types<_Types&...> is the result.
193 template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
194 struct __make_tuple_types_imp;
196 template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
197 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
199 typedef typename remove_reference<_Tp>::type _Tpr;
200 typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
201 typename conditional<is_lvalue_reference<_Tp>::value,
202 typename tuple_element<_Sp, _Tpr>::type&,
203 typename tuple_element<_Sp, _Tpr>::type>::type>,
204 _Tp, _Sp+1, _Ep>::type type;
207 template <class ..._Types, class _Tp, size_t _Ep>
208 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
210 typedef __tuple_types<_Types...> type;
213 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
214 struct __make_tuple_types
216 static_assert(_Sp <= _Ep, "__make_tuple_types input error");
217 typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
220 // __tuple_convertible
222 template <bool, class _Tp, class _Up>
223 struct __tuple_convertible_imp : public false_type {};
225 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
226 struct __tuple_convertible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
227 : public integral_constant<bool,
228 is_convertible<_Tp0, _Up0>::value &&
229 __tuple_convertible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
232 struct __tuple_convertible_imp<true, __tuple_types<>, __tuple_types<> >
233 : public true_type {};
235 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
236 bool = __tuple_like<_Up>::value>
237 struct __tuple_convertible
238 : public false_type {};
240 template <class _Tp, class _Up>
241 struct __tuple_convertible<_Tp, _Up, true, true>
242 : public __tuple_convertible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
243 tuple_size<_Up>::value,
244 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
247 // __tuple_constructible
249 template <bool, class _Tp, class _Up>
250 struct __tuple_constructible_imp : public false_type {};
252 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
253 struct __tuple_constructible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
254 : public integral_constant<bool,
255 is_constructible<_Up0, _Tp0>::value &&
256 __tuple_constructible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
259 struct __tuple_constructible_imp<true, __tuple_types<>, __tuple_types<> >
260 : public true_type {};
262 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
263 bool = __tuple_like<_Up>::value>
264 struct __tuple_constructible
265 : public false_type {};
267 template <class _Tp, class _Up>
268 struct __tuple_constructible<_Tp, _Up, true, true>
269 : public __tuple_constructible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
270 tuple_size<_Up>::value,
271 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
274 // __tuple_assignable
276 template <bool, class _Tp, class _Up>
277 struct __tuple_assignable_imp : public false_type {};
279 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
280 struct __tuple_assignable_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
281 : public integral_constant<bool,
282 is_assignable<_Up0&, _Tp0>::value &&
283 __tuple_assignable_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
286 struct __tuple_assignable_imp<true, __tuple_types<>, __tuple_types<> >
287 : public true_type {};
289 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
290 bool = __tuple_like<_Up>::value>
291 struct __tuple_assignable
292 : public false_type {};
294 template <class _Tp, class _Up>
295 struct __tuple_assignable<_Tp, _Up, true, true>
296 : public __tuple_assignable_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
297 tuple_size<_Up>::value,
298 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
301 _LIBCPP_END_NAMESPACE_STD
303 #endif // _LIBCPP_HAS_NO_VARIADICS
305 #endif // _LIBCPP___TUPLE