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
23 _LIBCPP_BEGIN_NAMESPACE_STD
25 template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
28 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
29 : public tuple_size<_Tp> {};
32 class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
33 : public tuple_size<_Tp> {};
36 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
37 : public tuple_size<_Tp> {};
39 template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
41 template <size_t _Ip, class _Tp>
42 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
45 typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
48 template <size_t _Ip, class _Tp>
49 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
52 typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
55 template <size_t _Ip, class _Tp>
56 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
59 typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
62 template <class _Tp> struct __tuple_like : false_type {};
64 template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
65 template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
66 template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
68 // tuple specializations
70 #if !defined(_LIBCPP_HAS_NO_VARIADICS)
71 template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
73 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
75 template <size_t _Ip, class ..._Tp>
76 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
77 typename tuple_element<_Ip, tuple<_Tp...> >::type&
78 get(tuple<_Tp...>&) _NOEXCEPT;
80 template <size_t _Ip, class ..._Tp>
81 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
82 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
83 get(const tuple<_Tp...>&) _NOEXCEPT;
85 template <size_t _Ip, class ..._Tp>
86 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
87 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
88 get(tuple<_Tp...>&&) _NOEXCEPT;
90 template <size_t _Ip, class ..._Tp>
91 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
92 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
93 get(const tuple<_Tp...>&&) _NOEXCEPT;
96 // pair specializations
98 template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS_ONLY pair;
100 template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
102 template <size_t _Ip, class _T1, class _T2>
103 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
104 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
105 get(pair<_T1, _T2>&) _NOEXCEPT;
107 template <size_t _Ip, class _T1, class _T2>
108 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
109 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
110 get(const pair<_T1, _T2>&) _NOEXCEPT;
112 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
113 template <size_t _Ip, class _T1, class _T2>
114 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
115 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
116 get(pair<_T1, _T2>&&) _NOEXCEPT;
118 template <size_t _Ip, class _T1, class _T2>
119 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
120 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
121 get(const pair<_T1, _T2>&&) _NOEXCEPT;
124 // array specializations
126 template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
128 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
130 template <size_t _Ip, class _Tp, size_t _Size>
131 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
133 get(array<_Tp, _Size>&) _NOEXCEPT;
135 template <size_t _Ip, class _Tp, size_t _Size>
136 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
138 get(const array<_Tp, _Size>&) _NOEXCEPT;
140 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
141 template <size_t _Ip, class _Tp, size_t _Size>
142 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
144 get(array<_Tp, _Size>&&) _NOEXCEPT;
146 template <size_t _Ip, class _Tp, size_t _Size>
147 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
149 get(const array<_Tp, _Size>&&) _NOEXCEPT;
152 #if !defined(_LIBCPP_HAS_NO_VARIADICS)
154 // __make_tuple_indices
156 template <size_t...> struct __tuple_indices {};
158 template <size_t _Sp, class _IntTuple, size_t _Ep>
159 struct __make_indices_imp;
161 template <size_t _Sp, size_t ..._Indices, size_t _Ep>
162 struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
164 typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
167 template <size_t _Ep, size_t ..._Indices>
168 struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
170 typedef __tuple_indices<_Indices...> type;
173 template <size_t _Ep, size_t _Sp = 0>
174 struct __make_tuple_indices
176 static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
177 typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
182 template <class ..._Tp> struct __tuple_types {};
184 template <size_t _Ip>
185 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
188 static_assert(_Ip == 0, "tuple_element index out of range");
189 static_assert(_Ip != 0, "tuple_element index out of range");
192 template <class _Hp, class ..._Tp>
193 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
199 template <size_t _Ip, class _Hp, class ..._Tp>
200 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
203 typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
206 template <class ..._Tp>
207 class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
208 : public integral_constant<size_t, sizeof...(_Tp)>
212 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
214 // __make_tuple_types
216 // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
217 // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
218 // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
219 // lvalue_reference type, then __tuple_types<_Types&...> is the result.
221 template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
222 struct __make_tuple_types_imp;
224 template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
225 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
227 typedef typename remove_reference<_Tp>::type _Tpr;
228 typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
229 typename conditional<is_lvalue_reference<_Tp>::value,
230 typename tuple_element<_Sp, _Tpr>::type&,
231 typename tuple_element<_Sp, _Tpr>::type>::type>,
232 _Tp, _Sp+1, _Ep>::type type;
235 template <class ..._Types, class _Tp, size_t _Ep>
236 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
238 typedef __tuple_types<_Types...> type;
241 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
242 struct __make_tuple_types
244 static_assert(_Sp <= _Ep, "__make_tuple_types input error");
245 typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
248 // __tuple_convertible
250 template <class, class>
251 struct __tuple_convertible_imp : public false_type {};
253 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
254 struct __tuple_convertible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
255 : public integral_constant<bool,
256 is_convertible<_Tp0, _Up0>::value &&
257 __tuple_convertible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
260 struct __tuple_convertible_imp<__tuple_types<>, __tuple_types<> >
261 : public true_type {};
263 template <bool, class, class>
264 struct __tuple_convertible_apply : public false_type {};
266 template <class _Tp, class _Up>
267 struct __tuple_convertible_apply<true, _Tp, _Up>
268 : public __tuple_convertible_imp<
269 typename __make_tuple_types<_Tp>::type
270 , typename __make_tuple_types<_Up>::type
274 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
275 bool = __tuple_like<_Up>::value>
276 struct __tuple_convertible
277 : public false_type {};
279 template <class _Tp, class _Up>
280 struct __tuple_convertible<_Tp, _Up, true, true>
281 : public __tuple_convertible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
282 tuple_size<_Up>::value, _Tp, _Up>
285 // __tuple_constructible
287 template <class, class>
288 struct __tuple_constructible_imp : public false_type {};
290 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
291 struct __tuple_constructible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
292 : public integral_constant<bool,
293 is_constructible<_Up0, _Tp0>::value &&
294 __tuple_constructible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
297 struct __tuple_constructible_imp<__tuple_types<>, __tuple_types<> >
298 : public true_type {};
300 template <bool _SameSize, class, class>
301 struct __tuple_constructible_apply : public false_type {};
303 template <class _Tp, class _Up>
304 struct __tuple_constructible_apply<true, _Tp, _Up>
305 : public __tuple_constructible_imp<
306 typename __make_tuple_types<_Tp>::type
307 , typename __make_tuple_types<_Up>::type
311 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
312 bool = __tuple_like<_Up>::value>
313 struct __tuple_constructible
314 : public false_type {};
316 template <class _Tp, class _Up>
317 struct __tuple_constructible<_Tp, _Up, true, true>
318 : public __tuple_constructible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
319 tuple_size<_Up>::value, _Tp, _Up>
322 // __tuple_assignable
324 template <class, class>
325 struct __tuple_assignable_imp : public false_type {};
327 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
328 struct __tuple_assignable_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
329 : public integral_constant<bool,
330 is_assignable<_Up0&, _Tp0>::value &&
331 __tuple_assignable_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
334 struct __tuple_assignable_imp<__tuple_types<>, __tuple_types<> >
335 : public true_type {};
337 template <bool, class, class>
338 struct __tuple_assignable_apply : public false_type {};
340 template <class _Tp, class _Up>
341 struct __tuple_assignable_apply<true, _Tp, _Up>
342 : __tuple_assignable_imp<
343 typename __make_tuple_types<_Tp>::type
344 , typename __make_tuple_types<_Up>::type
348 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
349 bool = __tuple_like<_Up>::value>
350 struct __tuple_assignable
351 : public false_type {};
353 template <class _Tp, class _Up>
354 struct __tuple_assignable<_Tp, _Up, true, true>
355 : public __tuple_assignable_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
356 tuple_size<_Up>::value, _Tp, _Up>
359 #endif // _LIBCPP_HAS_NO_VARIADICS
361 _LIBCPP_END_NAMESPACE_STD
363 #endif // _LIBCPP___TUPLE