| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TUPLE_TUPLE_LIKE_NO_SUBRANGE_H |
| #define _LIBCPP___TUPLE_TUPLE_LIKE_NO_SUBRANGE_H |
| |
| #include <__config> |
| #include <__fwd/array.h> |
| #include <__fwd/complex.h> |
| #include <__fwd/pair.h> |
| #include <__fwd/tuple.h> |
| #include <__tuple/tuple_size.h> |
| #include <__type_traits/remove_cvref.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| template <class _Tp> |
| inline constexpr bool __tuple_like_no_subrange_impl = false; |
| |
| template <class... _Tp> |
| inline constexpr bool __tuple_like_no_subrange_impl<tuple<_Tp...>> = true; |
| |
| template <class _T1, class _T2> |
| inline constexpr bool __tuple_like_no_subrange_impl<pair<_T1, _T2>> = true; |
| |
| template <class _Tp, size_t _Size> |
| inline constexpr bool __tuple_like_no_subrange_impl<array<_Tp, _Size>> = true; |
| |
| # if _LIBCPP_STD_VER >= 26 |
| |
| template <class _Tp> |
| inline constexpr bool __tuple_like_no_subrange_impl<complex<_Tp>> = true; |
| |
| # endif |
| |
| template <class _Tp> |
| concept __tuple_like_no_subrange = __tuple_like_no_subrange_impl<remove_cvref_t<_Tp>>; |
| |
| // This is equivalent to the exposition-only type trait `pair-like`, except that it is false for specializations of |
| // `ranges::subrange`. This is more useful than the pair-like concept in the standard because every use of `pair-like` |
| // excludes `ranges::subrange`. |
| template <class _Tp> |
| concept __pair_like_no_subrange = __tuple_like_no_subrange<_Tp> && tuple_size<remove_cvref_t<_Tp>>::value == 2; |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TUPLE_TUPLE_LIKE_NO_SUBRANGE_H |