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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___ALGORITHM_RANGES_ITERATOR_CONCEPT_H |
| 10 | #define _LIBCPP___ALGORITHM_RANGES_ITERATOR_CONCEPT_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__iterator/concepts.h> |
| 14 | #include <__iterator/iterator_traits.h> |
| 15 | #include <__type_traits/remove_cvref.h> |
| 16 | |
| 17 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 18 | # pragma GCC system_header |
| 19 | #endif |
| 20 | |
| 21 | _LIBCPP_PUSH_MACROS |
| 22 | #include <__undef_macros> |
| 23 | |
| 24 | #if _LIBCPP_STD_VER >= 20 |
| 25 | |
| 26 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 27 | |
| 28 | namespace ranges { |
| 29 | |
| 30 | template <class _IterMaybeQualified> |
| 31 | consteval auto __get_iterator_concept() { |
| 32 | using _Iter = __remove_cvref_t<_IterMaybeQualified>; |
| 33 | |
| 34 | if constexpr (contiguous_iterator<_Iter>) |
| 35 | return contiguous_iterator_tag(); |
| 36 | else if constexpr (random_access_iterator<_Iter>) |
| 37 | return random_access_iterator_tag(); |
| 38 | else if constexpr (bidirectional_iterator<_Iter>) |
| 39 | return bidirectional_iterator_tag(); |
| 40 | else if constexpr (forward_iterator<_Iter>) |
| 41 | return forward_iterator_tag(); |
| 42 | else if constexpr (input_iterator<_Iter>) |
| 43 | return input_iterator_tag(); |
| 44 | } |
| 45 | |
| 46 | template <class _Iter> |
| 47 | using __iterator_concept _LIBCPP_NODEBUG = decltype(ranges::__get_iterator_concept<_Iter>()); |
| 48 | |
| 49 | } // namespace ranges |
| 50 | _LIBCPP_END_NAMESPACE_STD |
| 51 | |
| 52 | #endif // _LIBCPP_STD_VER >= 20 |
| 53 | |
| 54 | _LIBCPP_POP_MACROS |
| 55 | |
| 56 | #endif // _LIBCPP___ALGORITHM_RANGES_ITERATOR_CONCEPT_H |
| 57 |
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