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_NO_SUBRANGE_H 10 #define _LIBCPP___TUPLE_TUPLE_LIKE_NO_SUBRANGE_H 11 12 #include <__config> 13 #include <__fwd/array.h> 14 #include <__fwd/complex.h> 15 #include <__fwd/pair.h> 16 #include <__fwd/tuple.h> 17 #include <__tuple/tuple_size.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 inline constexpr bool __tuple_like_no_subrange_impl = false; 31 32 template <class... _Tp> 33 inline constexpr bool __tuple_like_no_subrange_impl<tuple<_Tp...>> = true; 34 35 template <class _T1, class _T2> 36 inline constexpr bool __tuple_like_no_subrange_impl<pair<_T1, _T2>> = true; 37 38 template <class _Tp, size_t _Size> 39 inline constexpr bool __tuple_like_no_subrange_impl<array<_Tp, _Size>> = true; 40 41 # if _LIBCPP_STD_VER >= 26 42 43 template <class _Tp> 44 inline constexpr bool __tuple_like_no_subrange_impl<complex<_Tp>> = true; 45 46 # endif 47 48 template <class _Tp> 49 concept __tuple_like_no_subrange = __tuple_like_no_subrange_impl<remove_cvref_t<_Tp>>; 50 51 // This is equivalent to the exposition-only type trait `pair-like`, except that it is false for specializations of 52 // `ranges::subrange`. This is more useful than the pair-like concept in the standard because every use of `pair-like` 53 // excludes `ranges::subrange`. 54 template <class _Tp> 55 concept __pair_like_no_subrange = __tuple_like_no_subrange<_Tp> && tuple_size<remove_cvref_t<_Tp>>::value == 2; 56 57 #endif // _LIBCPP_STD_VER >= 20 58 59 _LIBCPP_END_NAMESPACE_STD 60 61 #endif // _LIBCPP___TUPLE_TUPLE_LIKE_NO_SUBRANGE_H 62