| //===----------------------------------------------------------------------===// |
| // |
| // 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___ALGORITHM_RANGES_ITERATOR_CONCEPT_H |
| #define _LIBCPP___ALGORITHM_RANGES_ITERATOR_CONCEPT_H |
| |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/iterator_traits.h> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER > 17 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| |
| template <class _IterMaybeQualified> |
| consteval auto __get_iterator_concept() { |
| using _Iter = __remove_cvref_t<_IterMaybeQualified>; |
| |
| if constexpr (contiguous_iterator<_Iter>) |
| return contiguous_iterator_tag(); |
| else if constexpr (random_access_iterator<_Iter>) |
| return random_access_iterator_tag(); |
| else if constexpr (bidirectional_iterator<_Iter>) |
| return bidirectional_iterator_tag(); |
| else if constexpr (forward_iterator<_Iter>) |
| return forward_iterator_tag(); |
| else if constexpr (input_iterator<_Iter>) |
| return input_iterator_tag(); |
| } |
| |
| template <class _Iter> |
| using __iterator_concept = decltype(__get_iterator_concept<_Iter>()); |
| |
| } // namespace ranges |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER > 17 |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_ITERATOR_CONCEPT_H |
