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)
72 template <size_t...> struct __tuple_indices {};
74 template <class _IdxType, _IdxType... _Values>
75 struct __integer_sequence {
76 template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
77 using __convert = _ToIndexSeq<_ToIndexType, _Values...>;
80 using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>;
83 #if !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
86 template<typename _Tp, size_t ..._Extra> struct __repeat;
87 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
88 typedef __integer_sequence<_Tp,
90 sizeof...(_Np) + _Np...,
91 2 * sizeof...(_Np) + _Np...,
92 3 * sizeof...(_Np) + _Np...,
93 4 * sizeof...(_Np) + _Np...,
94 5 * sizeof...(_Np) + _Np...,
95 6 * sizeof...(_Np) + _Np...,
96 7 * sizeof...(_Np) + _Np...,
100 template<size_t _Np> struct __parity;
101 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
103 template<> struct __make<0> { typedef __integer_sequence<size_t> type; };
104 template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; };
105 template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; };
106 template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; };
107 template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; };
108 template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
109 template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
110 template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
112 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
113 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
114 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
115 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
116 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
117 template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
118 template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
119 template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
121 } // namespace detail
123 #endif // !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
125 #if __has_builtin(__make_integer_seq)
126 template <size_t _Ep, size_t _Sp>
127 using __make_indices_imp =
128 typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template
129 __to_tuple_indices<_Sp>;
131 template <size_t _Ep, size_t _Sp>
132 using __make_indices_imp =
133 typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>;
137 template <size_t _Ep, size_t _Sp = 0>
138 struct __make_tuple_indices
140 static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
141 typedef __make_indices_imp<_Ep, _Sp> type;
145 template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
147 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
149 template <size_t _Ip, class ..._Tp>
150 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
151 typename tuple_element<_Ip, tuple<_Tp...> >::type&
152 get(tuple<_Tp...>&) _NOEXCEPT;
154 template <size_t _Ip, class ..._Tp>
155 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
156 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
157 get(const tuple<_Tp...>&) _NOEXCEPT;
159 template <size_t _Ip, class ..._Tp>
160 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
161 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
162 get(tuple<_Tp...>&&) _NOEXCEPT;
164 template <size_t _Ip, class ..._Tp>
165 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
166 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
167 get(const tuple<_Tp...>&&) _NOEXCEPT;
170 // pair specializations
172 template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
174 template <size_t _Ip, class _T1, class _T2>
175 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
176 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
177 get(pair<_T1, _T2>&) _NOEXCEPT;
179 template <size_t _Ip, class _T1, class _T2>
180 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
181 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
182 get(const pair<_T1, _T2>&) _NOEXCEPT;
184 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
185 template <size_t _Ip, class _T1, class _T2>
186 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
187 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
188 get(pair<_T1, _T2>&&) _NOEXCEPT;
190 template <size_t _Ip, class _T1, class _T2>
191 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
192 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
193 get(const pair<_T1, _T2>&&) _NOEXCEPT;
196 // array specializations
198 template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
200 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
202 template <size_t _Ip, class _Tp, size_t _Size>
203 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
205 get(array<_Tp, _Size>&) _NOEXCEPT;
207 template <size_t _Ip, class _Tp, size_t _Size>
208 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
210 get(const array<_Tp, _Size>&) _NOEXCEPT;
212 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
213 template <size_t _Ip, class _Tp, size_t _Size>
214 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
216 get(array<_Tp, _Size>&&) _NOEXCEPT;
218 template <size_t _Ip, class _Tp, size_t _Size>
219 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
221 get(const array<_Tp, _Size>&&) _NOEXCEPT;
224 #if !defined(_LIBCPP_HAS_NO_VARIADICS)
229 template <class ..._Tp> struct __tuple_types {};
231 #if !__has_builtin(__type_pack_element)
233 namespace __indexer_detail {
235 template <size_t _Idx, class _Tp>
236 struct __indexed { using type = _Tp; };
238 template <class _Types, class _Indexes> struct __indexer;
240 template <class ..._Types, size_t ..._Idx>
241 struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
242 : __indexed<_Idx, _Types>...
245 template <size_t _Idx, class _Tp>
246 __indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);
248 } // namespace __indexer_detail
250 template <size_t _Idx, class ..._Types>
251 using __type_pack_element = typename decltype(
252 __indexer_detail::__at_index<_Idx>(
253 __indexer_detail::__indexer<
254 __tuple_types<_Types...>,
255 typename __make_tuple_indices<sizeof...(_Types)>::type
260 template <size_t _Ip, class ..._Types>
261 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Types...>>
264 static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
265 typedef __type_pack_element<_Ip, _Types...> type;
269 template <class ..._Tp>
270 class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
271 : public integral_constant<size_t, sizeof...(_Tp)>
275 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
277 template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile>
278 struct __apply_cv_mf;
280 struct __apply_cv_mf<false, false, false> {
281 template <class _Tp> using __apply = _Tp;
284 struct __apply_cv_mf<false, true, false> {
285 template <class _Tp> using __apply = const _Tp;
288 struct __apply_cv_mf<false, false, true> {
289 template <class _Tp> using __apply = volatile _Tp;
292 struct __apply_cv_mf<false, true, true> {
293 template <class _Tp> using __apply = const volatile _Tp;
296 struct __apply_cv_mf<true, false, false> {
297 template <class _Tp> using __apply = _Tp&;
300 struct __apply_cv_mf<true, true, false> {
301 template <class _Tp> using __apply = const _Tp&;
304 struct __apply_cv_mf<true, false, true> {
305 template <class _Tp> using __apply = volatile _Tp&;
308 struct __apply_cv_mf<true, true, true> {
309 template <class _Tp> using __apply = const volatile _Tp&;
311 template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
312 using __apply_cv_t = __apply_cv_mf<
313 is_lvalue_reference<_Tp>::value,
314 is_const<_RawTp>::value,
315 is_volatile<_RawTp>::value>;
317 // __make_tuple_types
319 // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
320 // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
321 // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
322 // lvalue_reference type, then __tuple_types<_Types&...> is the result.
324 template <class _TupleTypes, class _TupleIndices>
325 struct __make_tuple_types_flat;
327 template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx>
328 struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
329 // Specialization for pair, tuple, and __tuple_types
330 template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
331 using __apply_quals = __tuple_types<
332 typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
336 template <class _Vt, size_t _Np, size_t ..._Idx>
337 struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> {
339 using __value_type = _Vt;
340 template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
341 using __apply_quals = __tuple_types<
342 typename _ApplyFn::template __apply<__value_type<_Idx>>...
346 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value,
348 bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)>
349 struct __make_tuple_types
351 static_assert(_Sp <= _Ep, "__make_tuple_types input error");
352 using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type;
353 using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
354 using type = typename _Maker::template __apply_quals<_Tp>;
357 template <class ..._Types, size_t _Ep>
358 struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
359 typedef __tuple_types<_Types...> type;
362 template <class ..._Types, size_t _Ep>
363 struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
364 typedef __tuple_types<_Types...> type;
367 template <bool ..._Preds>
370 template <bool ..._Pred>
371 using __all = is_same<__all_dummy<_Pred...>, __all_dummy<(_Pred, true)...>>;
373 struct __tuple_sfinae_base {
374 template <template <class, class...> class _Trait,
375 class ..._LArgs, class ..._RArgs>
376 static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
377 -> __all<typename enable_if<_Trait<_LArgs, _RArgs>::value, bool>::type{true}...>;
378 template <template <class...> class>
379 static auto __do_test(...) -> false_type;
381 template <class _FromArgs, class _ToArgs>
382 using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{}));
383 template <class _FromArgs, class _ToArgs>
384 using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{}));
385 template <class _FromArgs, class _ToArgs>
386 using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{}));
389 // __tuple_convertible
391 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
392 bool = __tuple_like<_Up>::value>
393 struct __tuple_convertible
394 : public false_type {};
396 template <class _Tp, class _Up>
397 struct __tuple_convertible<_Tp, _Up, true, true>
398 : public __tuple_sfinae_base::__convertible<
399 typename __make_tuple_types<_Tp>::type
400 , typename __make_tuple_types<_Up>::type
404 // __tuple_constructible
406 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
407 bool = __tuple_like<_Up>::value>
408 struct __tuple_constructible
409 : public false_type {};
411 template <class _Tp, class _Up>
412 struct __tuple_constructible<_Tp, _Up, true, true>
413 : public __tuple_sfinae_base::__constructible<
414 typename __make_tuple_types<_Tp>::type
415 , typename __make_tuple_types<_Up>::type
419 // __tuple_assignable
421 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
422 bool = __tuple_like<_Up>::value>
423 struct __tuple_assignable
424 : public false_type {};
426 template <class _Tp, class _Up>
427 struct __tuple_assignable<_Tp, _Up, true, true>
428 : public __tuple_sfinae_base::__assignable<
429 typename __make_tuple_types<_Tp>::type
430 , typename __make_tuple_types<_Up&>::type
434 #endif // _LIBCPP_HAS_NO_VARIADICS
436 _LIBCPP_END_NAMESPACE_STD
438 #endif // _LIBCPP___TUPLE