134 lines
3.8 KiB
C++
134 lines
3.8 KiB
C++
// -*- C++ -*-
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//===--------------------- __ranges/concepts.h ----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANGES_CONCEPTS_H
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#define _LIBCPP___RANGES_CONCEPTS_H
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/iter_move.h>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/readable_traits.h>
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#include <__ranges/access.h>
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#include <__ranges/enable_borrowed_range.h>
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#include <__ranges/data.h>
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#include <__ranges/enable_view.h>
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#include <__ranges/size.h>
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#include <concepts>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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// clang-format off
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#if !defined(_LIBCPP_HAS_NO_RANGES)
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namespace ranges {
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// [range.range]
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template <class _Tp>
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concept range = requires(_Tp& __t) {
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ranges::begin(__t); // sometimes equality-preserving
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ranges::end(__t);
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};
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template<class _Range>
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concept borrowed_range = range<_Range> &&
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(is_lvalue_reference_v<_Range> || enable_borrowed_range<remove_cvref_t<_Range>>);
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// `iterator_t` defined in <__ranges/access.h>
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template <range _Rp>
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using sentinel_t = decltype(ranges::end(declval<_Rp&>()));
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template <range _Rp>
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using range_difference_t = iter_difference_t<iterator_t<_Rp>>;
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template <range _Rp>
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using range_value_t = iter_value_t<iterator_t<_Rp>>;
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template <range _Rp>
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using range_reference_t = iter_reference_t<iterator_t<_Rp>>;
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template <range _Rp>
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using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp>>;
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// [range.sized]
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template <class _Tp>
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concept sized_range = range<_Tp> && requires(_Tp& __t) { ranges::size(__t); };
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template<sized_range _Rp>
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using range_size_t = decltype(ranges::size(declval<_Rp&>()));
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// `disable_sized_range` defined in `<__ranges/size.h>`
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// [range.view], views
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// `enable_view` defined in <__ranges/enable_view.h>
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// `view_base` defined in <__ranges/enable_view.h>
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template <class _Tp>
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concept view =
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range<_Tp> &&
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movable<_Tp> &&
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enable_view<_Tp>;
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template<class _Range>
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concept __simple_view =
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view<_Range> && range<const _Range> &&
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same_as<iterator_t<_Range>, iterator_t<const _Range>> &&
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same_as<sentinel_t<_Range>, iterator_t<const _Range>>;
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// [range.refinements], other range refinements
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template <class _Rp, class _Tp>
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concept output_range = range<_Rp> && output_iterator<iterator_t<_Rp>, _Tp>;
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template <class _Tp>
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concept input_range = range<_Tp> && input_iterator<iterator_t<_Tp>>;
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template <class _Tp>
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concept forward_range = input_range<_Tp> && forward_iterator<iterator_t<_Tp>>;
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template <class _Tp>
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concept bidirectional_range = forward_range<_Tp> && bidirectional_iterator<iterator_t<_Tp>>;
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template <class _Tp>
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concept random_access_range =
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bidirectional_range<_Tp> && random_access_iterator<iterator_t<_Tp>>;
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template<class _Tp>
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concept contiguous_range =
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random_access_range<_Tp> &&
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contiguous_iterator<iterator_t<_Tp>> &&
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requires(_Tp& __t) {
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{ ranges::data(__t) } -> same_as<add_pointer_t<range_reference_t<_Tp>>>;
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};
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template <class _Tp>
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concept common_range = range<_Tp> && same_as<iterator_t<_Tp>, sentinel_t<_Tp>>;
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template<class _Tp>
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concept viewable_range =
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range<_Tp> && (
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(view<remove_cvref_t<_Tp>> && constructible_from<remove_cvref_t<_Tp>, _Tp>) ||
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(!view<remove_cvref_t<_Tp>> && borrowed_range<_Tp>)
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);
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} // namespace ranges
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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// clang-format on
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_CONCEPTS_H
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