1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___TUPLE_TUPLE_LIKE_H 10 #define _LIBCPP___TUPLE_TUPLE_LIKE_H 11 12 #include <__config> 13 #include <__fwd/array.h> 14 #include <__fwd/pair.h> 15 #include <__fwd/subrange.h> 16 #include <__fwd/tuple.h> 17 #include <__type_traits/integral_constant.h> 18 #include <__type_traits/remove_cvref.h> 19 #include <cstddef> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 #endif 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 #if _LIBCPP_STD_VER >= 20 28 29 template <class _Tp> 30 struct __tuple_like_impl : false_type {}; 31 32 template <class... _Tp> 33 struct __tuple_like_impl<tuple<_Tp...> > : true_type {}; 34 35 template <class _T1, class _T2> 36 struct __tuple_like_impl<pair<_T1, _T2> > : true_type {}; 37 38 template <class _Tp, size_t _Size> 39 struct __tuple_like_impl<array<_Tp, _Size> > : true_type {}; 40 41 template <class _Ip, class _Sp, ranges::subrange_kind _Kp> 42 struct __tuple_like_impl<ranges::subrange<_Ip, _Sp, _Kp> > : true_type {}; 43 44 template <class _Tp> 45 concept __tuple_like = __tuple_like_impl<remove_cvref_t<_Tp>>::value; 46 47 #endif // _LIBCPP_STD_VER >= 20 48 49 _LIBCPP_END_NAMESPACE_STD 50 51 #endif // _LIBCPP___TUPLE_TUPLE_LIKE_H 52