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_VISIBLE tuple_size;
33 class _LIBCPP_VISIBLE tuple_size<const _Tp>
34 : public tuple_size<_Tp> {};
37 class _LIBCPP_VISIBLE tuple_size<volatile _Tp>
38 : public tuple_size<_Tp> {};
41 class _LIBCPP_VISIBLE tuple_size<const volatile _Tp>
42 : public tuple_size<_Tp> {};
44 template <size_t _Ip, class _Tp> class _LIBCPP_VISIBLE tuple_element;
46 template <size_t _Ip, class _Tp>
47 class _LIBCPP_VISIBLE 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_VISIBLE 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_VISIBLE 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_VISIBLE tuple;
68 template <class _T1, class _T2> class _LIBCPP_VISIBLE pair;
69 template <class _Tp, size_t _Size> struct _LIBCPP_VISIBLE 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 typename tuple_element<_Ip, tuple<_Tp...> >::type&
83 get(tuple<_Tp...>&) _NOEXCEPT;
85 template <size_t _Ip, class ..._Tp>
86 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
87 get(const tuple<_Tp...>&) _NOEXCEPT;
89 template <size_t _Ip, class ..._Tp>
90 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
91 get(tuple<_Tp...>&&) _NOEXCEPT;
93 template <size_t _Ip, class _T1, class _T2>
94 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
95 get(pair<_T1, _T2>&) _NOEXCEPT;
97 template <size_t _Ip, class _T1, class _T2>
98 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
99 get(const pair<_T1, _T2>&) _NOEXCEPT;
101 template <size_t _Ip, class _T1, class _T2>
102 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
103 get(pair<_T1, _T2>&&) _NOEXCEPT;
105 template <size_t _Ip, class _Tp, size_t _Size>
107 get(array<_Tp, _Size>&) _NOEXCEPT;
109 template <size_t _Ip, class _Tp, size_t _Size>
111 get(const array<_Tp, _Size>&) _NOEXCEPT;
113 template <size_t _Ip, class _Tp, size_t _Size>
115 get(array<_Tp, _Size>&&) _NOEXCEPT;
117 // __make_tuple_indices
119 template <size_t...> struct __tuple_indices {};
121 template <size_t _Sp, class _IntTuple, size_t _Ep>
122 struct __make_indices_imp;
124 template <size_t _Sp, size_t ..._Indices, size_t _Ep>
125 struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
127 typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
130 template <size_t _Ep, size_t ..._Indices>
131 struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
133 typedef __tuple_indices<_Indices...> type;
136 template <size_t _Ep, size_t _Sp = 0>
137 struct __make_tuple_indices
139 static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
140 typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
145 template <class ..._Tp> struct __tuple_types {};
147 template <size_t _Ip>
148 class _LIBCPP_VISIBLE tuple_element<_Ip, __tuple_types<> >
151 static_assert(_Ip == 0, "tuple_element index out of range");
152 static_assert(_Ip != 0, "tuple_element index out of range");
155 template <class _Hp, class ..._Tp>
156 class _LIBCPP_VISIBLE tuple_element<0, __tuple_types<_Hp, _Tp...> >
162 template <size_t _Ip, class _Hp, class ..._Tp>
163 class _LIBCPP_VISIBLE tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
166 typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
169 template <class ..._Tp>
170 class _LIBCPP_VISIBLE tuple_size<__tuple_types<_Tp...> >
171 : public integral_constant<size_t, sizeof...(_Tp)>
175 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
177 // __make_tuple_types
179 // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
180 // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
181 // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
182 // lvalue_reference type, then __tuple_types<_Types&...> is the result.
184 template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
185 struct __make_tuple_types_imp;
187 template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
188 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
190 typedef typename remove_reference<_Tp>::type _Tpr;
191 typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
192 typename conditional<is_lvalue_reference<_Tp>::value,
193 typename tuple_element<_Sp, _Tpr>::type&,
194 typename tuple_element<_Sp, _Tpr>::type>::type>,
195 _Tp, _Sp+1, _Ep>::type type;
198 template <class ..._Types, class _Tp, size_t _Ep>
199 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
201 typedef __tuple_types<_Types...> type;
204 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
205 struct __make_tuple_types
207 static_assert(_Sp <= _Ep, "__make_tuple_types input error");
208 typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
211 // __tuple_convertible
213 template <bool, class _Tp, class _Up>
214 struct __tuple_convertible_imp : public false_type {};
216 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
217 struct __tuple_convertible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
218 : public integral_constant<bool,
219 is_constructible<_Up0, _Tp0>::value &&
220 __tuple_convertible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
223 struct __tuple_convertible_imp<true, __tuple_types<>, __tuple_types<> >
224 : public true_type {};
226 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
227 bool = __tuple_like<_Up>::value>
228 struct __tuple_convertible
229 : public false_type {};
231 template <class _Tp, class _Up>
232 struct __tuple_convertible<_Tp, _Up, true, true>
233 : public __tuple_convertible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
234 tuple_size<_Up>::value,
235 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
238 // __tuple_assignable
240 template <bool, class _Tp, class _Up>
241 struct __tuple_assignable_imp : public false_type {};
243 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
244 struct __tuple_assignable_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
245 : public integral_constant<bool,
246 is_assignable<_Up0&, _Tp0>::value &&
247 __tuple_assignable_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
250 struct __tuple_assignable_imp<true, __tuple_types<>, __tuple_types<> >
251 : public true_type {};
253 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
254 bool = __tuple_like<_Up>::value>
255 struct __tuple_assignable
256 : public false_type {};
258 template <class _Tp, class _Up>
259 struct __tuple_assignable<_Tp, _Up, true, true>
260 : public __tuple_assignable_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
261 tuple_size<_Up>::value,
262 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
265 _LIBCPP_END_NAMESPACE_STD
267 #endif // _LIBCPP_HAS_NO_VARIADICS
269 #endif // _LIBCPP___TUPLE