| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // 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___RANGES_CONCEPTS_H |
| #define _LIBCPP___RANGES_CONCEPTS_H |
| |
| #include <__concepts/constructible.h> |
| #include <__concepts/movable.h> |
| #include <__concepts/same_as.h> |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/incrementable_traits.h> |
| #include <__iterator/iter_move.h> |
| #include <__iterator/iterator_traits.h> |
| #include <__iterator/readable_traits.h> |
| #include <__ranges/access.h> |
| #include <__ranges/data.h> |
| #include <__ranges/enable_borrowed_range.h> |
| #include <__ranges/enable_view.h> |
| #include <__ranges/size.h> |
| #include <__type_traits/add_pointer.h> |
| #include <__type_traits/is_reference.h> |
| #include <__type_traits/remove_cvref.h> |
| #include <__type_traits/remove_reference.h> |
| #include <__utility/declval.h> |
| #include <initializer_list> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| namespace ranges { |
| |
| // [range.range] |
| |
| template <class _Tp> |
| concept range = requires(_Tp& __t) { |
| ranges::begin(__t); // sometimes equality-preserving |
| ranges::end(__t); |
| }; |
| |
| template <class _Tp> |
| concept input_range = range<_Tp> && input_iterator<iterator_t<_Tp>>; |
| |
| template <class _Range> |
| concept borrowed_range = |
| range<_Range> && (is_lvalue_reference_v<_Range> || enable_borrowed_range<remove_cvref_t<_Range>>); |
| |
| // `iterator_t` defined in <__ranges/access.h> |
| |
| template <range _Rp> |
| using sentinel_t = decltype(ranges::end(std::declval<_Rp&>())); |
| |
| template <range _Rp> |
| using range_difference_t = iter_difference_t<iterator_t<_Rp>>; |
| |
| template <range _Rp> |
| using range_value_t = iter_value_t<iterator_t<_Rp>>; |
| |
| template <range _Rp> |
| using range_reference_t = iter_reference_t<iterator_t<_Rp>>; |
| |
| template <range _Rp> |
| using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp>>; |
| |
| template <range _Rp> |
| using range_common_reference_t = iter_common_reference_t<iterator_t<_Rp>>; |
| |
| // [range.sized] |
| template <class _Tp> |
| concept sized_range = range<_Tp> && requires(_Tp& __t) { ranges::size(__t); }; |
| |
| template <sized_range _Rp> |
| using range_size_t = decltype(ranges::size(std::declval<_Rp&>())); |
| |
| // `disable_sized_range` defined in `<__ranges/size.h>` |
| |
| // [range.view], views |
| |
| // `enable_view` defined in <__ranges/enable_view.h> |
| // `view_base` defined in <__ranges/enable_view.h> |
| |
| template <class _Tp> |
| concept view = range<_Tp> && movable<_Tp> && enable_view<_Tp>; |
| |
| template <class _Range> |
| concept __simple_view = |
| view<_Range> && range<const _Range> && same_as<iterator_t<_Range>, iterator_t<const _Range>> && |
| same_as<sentinel_t<_Range>, sentinel_t<const _Range>>; |
| |
| // [range.refinements], other range refinements |
| template <class _Rp, class _Tp> |
| concept output_range = range<_Rp> && output_iterator<iterator_t<_Rp>, _Tp>; |
| |
| template <class _Tp> |
| concept forward_range = input_range<_Tp> && forward_iterator<iterator_t<_Tp>>; |
| |
| template <class _Tp> |
| concept bidirectional_range = forward_range<_Tp> && bidirectional_iterator<iterator_t<_Tp>>; |
| |
| template <class _Tp> |
| concept random_access_range = bidirectional_range<_Tp> && random_access_iterator<iterator_t<_Tp>>; |
| |
| template <class _Tp> |
| concept contiguous_range = random_access_range<_Tp> && contiguous_iterator<iterator_t<_Tp>> && requires(_Tp& __t) { |
| { ranges::data(__t) } -> same_as<add_pointer_t<range_reference_t<_Tp>>>; |
| }; |
| |
| template <class _Tp> |
| concept common_range = range<_Tp> && same_as<iterator_t<_Tp>, sentinel_t<_Tp>>; |
| |
| template <class _Tp> |
| inline constexpr bool __is_std_initializer_list = false; |
| |
| template <class _Ep> |
| inline constexpr bool __is_std_initializer_list<initializer_list<_Ep>> = true; |
| |
| template <class _Tp> |
| concept viewable_range = |
| range<_Tp> && |
| ((view<remove_cvref_t<_Tp>> && constructible_from<remove_cvref_t<_Tp>, _Tp>) || |
| (!view<remove_cvref_t<_Tp>> && |
| (is_lvalue_reference_v<_Tp> || |
| (movable<remove_reference_t<_Tp>> && !__is_std_initializer_list<remove_cvref_t<_Tp>>)))); |
| |
| } // namespace ranges |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___RANGES_CONCEPTS_H |