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
32 template <bool _Last, class ..._Preds>
33 struct __lazy_and_impl;
35 template <class ..._Preds>
36 struct __lazy_and_impl<false, _Preds...> : false_type {};
39 struct __lazy_and_impl<true> : true_type {};
41 template <class _Pred>
42 struct __lazy_and_impl<true, _Pred> : integral_constant<bool, _Pred::type::value> {};
44 template <class _Hp, class ..._Tp>
45 struct __lazy_and_impl<true, _Hp, _Tp...> : __lazy_and_impl<_Hp::type::value, _Tp...> {};
47 template <class _P1, class ..._Pr>
48 struct __lazy_and : __lazy_and_impl<_P1::type::value, _Pr...> {};
52 template <class _Pred>
53 struct __lazy_not : integral_constant<bool, !_Pred::type::value> {};
56 template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
59 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
60 : public tuple_size<_Tp> {};
63 class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
64 : public tuple_size<_Tp> {};
67 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
68 : public tuple_size<_Tp> {};
70 template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
72 template <size_t _Ip, class _Tp>
73 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
76 typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
79 template <size_t _Ip, class _Tp>
80 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
83 typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
86 template <size_t _Ip, class _Tp>
87 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
90 typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
93 template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
94 template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS_ONLY pair;
95 template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
97 template <class _Tp> struct __tuple_like : false_type {};
99 template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
100 template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
101 template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
103 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
104 template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
105 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
107 template <size_t _Ip, class ..._Tp>
108 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
109 typename tuple_element<_Ip, tuple<_Tp...> >::type&
110 get(tuple<_Tp...>&) _NOEXCEPT;
112 template <size_t _Ip, class ..._Tp>
113 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
114 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
115 get(const tuple<_Tp...>&) _NOEXCEPT;
117 template <size_t _Ip, class ..._Tp>
118 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
119 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
120 get(tuple<_Tp...>&&) _NOEXCEPT;
122 template <size_t _Ip, class _T1, class _T2>
123 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
124 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
125 get(pair<_T1, _T2>&) _NOEXCEPT;
127 template <size_t _Ip, class _T1, class _T2>
128 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
129 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
130 get(const pair<_T1, _T2>&) _NOEXCEPT;
132 template <size_t _Ip, class _T1, class _T2>
133 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
134 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
135 get(pair<_T1, _T2>&&) _NOEXCEPT;
137 template <size_t _Ip, class _Tp, size_t _Size>
138 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
140 get(array<_Tp, _Size>&) _NOEXCEPT;
142 template <size_t _Ip, class _Tp, size_t _Size>
143 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
145 get(const array<_Tp, _Size>&) _NOEXCEPT;
147 template <size_t _Ip, class _Tp, size_t _Size>
148 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
150 get(array<_Tp, _Size>&&) _NOEXCEPT;
152 // __make_tuple_indices
154 template <size_t...> struct __tuple_indices {};
156 template <size_t _Sp, class _IntTuple, size_t _Ep>
157 struct __make_indices_imp;
159 template <size_t _Sp, size_t ..._Indices, size_t _Ep>
160 struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
162 typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
165 template <size_t _Ep, size_t ..._Indices>
166 struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
168 typedef __tuple_indices<_Indices...> type;
171 template <size_t _Ep, size_t _Sp = 0>
172 struct __make_tuple_indices
174 static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
175 typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
180 template <class ..._Tp> struct __tuple_types {};
182 template <size_t _Ip>
183 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
186 static_assert(_Ip == 0, "tuple_element index out of range");
187 static_assert(_Ip != 0, "tuple_element index out of range");
190 template <class _Hp, class ..._Tp>
191 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
197 template <size_t _Ip, class _Hp, class ..._Tp>
198 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
201 typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
204 template <class ..._Tp>
205 class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
206 : public integral_constant<size_t, sizeof...(_Tp)>
210 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
212 // __make_tuple_types
214 // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
215 // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
216 // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
217 // lvalue_reference type, then __tuple_types<_Types&...> is the result.
219 template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
220 struct __make_tuple_types_imp;
222 template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
223 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
225 typedef typename remove_reference<_Tp>::type _Tpr;
226 typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
227 typename conditional<is_lvalue_reference<_Tp>::value,
228 typename tuple_element<_Sp, _Tpr>::type&,
229 typename tuple_element<_Sp, _Tpr>::type>::type>,
230 _Tp, _Sp+1, _Ep>::type type;
233 template <class ..._Types, class _Tp, size_t _Ep>
234 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
236 typedef __tuple_types<_Types...> type;
239 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
240 struct __make_tuple_types
242 static_assert(_Sp <= _Ep, "__make_tuple_types input error");
243 typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
246 // __tuple_convertible
248 template <bool, class _Tp, class _Up>
249 struct __tuple_convertible_imp : public false_type {};
251 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
252 struct __tuple_convertible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
253 : public integral_constant<bool,
254 is_convertible<_Tp0, _Up0>::value &&
255 __tuple_convertible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
258 struct __tuple_convertible_imp<true, __tuple_types<>, __tuple_types<> >
259 : public true_type {};
261 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
262 bool = __tuple_like<_Up>::value>
263 struct __tuple_convertible
264 : public false_type {};
266 template <class _Tp, class _Up>
267 struct __tuple_convertible<_Tp, _Up, true, true>
268 : public __tuple_convertible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
269 tuple_size<_Up>::value,
270 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
273 // __tuple_constructible
275 template <bool, class _Tp, class _Up>
276 struct __tuple_constructible_imp : public false_type {};
278 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
279 struct __tuple_constructible_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
280 : public integral_constant<bool,
281 is_constructible<_Up0, _Tp0>::value &&
282 __tuple_constructible_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
285 struct __tuple_constructible_imp<true, __tuple_types<>, __tuple_types<> >
286 : public true_type {};
288 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
289 bool = __tuple_like<_Up>::value>
290 struct __tuple_constructible
291 : public false_type {};
293 template <class _Tp, class _Up>
294 struct __tuple_constructible<_Tp, _Up, true, true>
295 : public __tuple_constructible_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
296 tuple_size<_Up>::value,
297 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
300 // __tuple_assignable
302 template <bool, class _Tp, class _Up>
303 struct __tuple_assignable_imp : public false_type {};
305 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
306 struct __tuple_assignable_imp<true, __tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
307 : public integral_constant<bool,
308 is_assignable<_Up0&, _Tp0>::value &&
309 __tuple_assignable_imp<true, __tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
312 struct __tuple_assignable_imp<true, __tuple_types<>, __tuple_types<> >
313 : public true_type {};
315 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
316 bool = __tuple_like<_Up>::value>
317 struct __tuple_assignable
318 : public false_type {};
320 template <class _Tp, class _Up>
321 struct __tuple_assignable<_Tp, _Up, true, true>
322 : public __tuple_assignable_imp<tuple_size<typename remove_reference<_Tp>::type>::value ==
323 tuple_size<_Up>::value,
324 typename __make_tuple_types<_Tp>::type, typename __make_tuple_types<_Up>::type>
327 _LIBCPP_END_NAMESPACE_STD
329 #endif // _LIBCPP_HAS_NO_VARIADICS
331 #endif // _LIBCPP___TUPLE