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| 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 <__cstddef/size_t.h> |
| 14 | #include <__fwd/array.h> |
| 15 | #include <__fwd/complex.h> |
| 16 | #include <__fwd/pair.h> |
| 17 | #include <__fwd/tuple.h> |
| 18 | #include <__tuple/tuple_size.h> |
| 19 | #include <__type_traits/remove_cvref.h> |
| 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 |
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