forked from OSchip/llvm-project
110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_COMMON_VIEW_H
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#define _LIBCPP___RANGES_COMMON_VIEW_H
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#include <__config>
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#include <__iterator/common_iterator.h>
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#include <__iterator/iterator_traits.h>
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#include <__ranges/access.h>
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#include <__ranges/all.h>
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#include <__ranges/concepts.h>
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#include <__ranges/enable_borrowed_range.h>
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#include <__ranges/size.h>
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#include <__ranges/view_interface.h>
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#include <__utility/move.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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#if !defined(_LIBCPP_HAS_NO_RANGES)
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namespace ranges {
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template<view _View>
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requires (!common_range<_View> && copyable<iterator_t<_View>>)
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class common_view : public view_interface<common_view<_View>> {
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_View __base_ = _View();
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public:
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_LIBCPP_HIDE_FROM_ABI
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common_view() requires default_initializable<_View> = default;
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_LIBCPP_HIDE_FROM_ABI
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constexpr explicit common_view(_View __v) : __base_(_VSTD::move(__v)) { }
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_LIBCPP_HIDE_FROM_ABI
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constexpr _View base() const& requires copy_constructible<_View> { return __base_; }
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_LIBCPP_HIDE_FROM_ABI
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constexpr _View base() && { return _VSTD::move(__base_); }
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto begin() {
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if constexpr (random_access_range<_View> && sized_range<_View>)
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return ranges::begin(__base_);
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else
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return common_iterator<iterator_t<_View>, sentinel_t<_View>>(ranges::begin(__base_));
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}
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto begin() const requires range<const _View> {
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if constexpr (random_access_range<const _View> && sized_range<const _View>)
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return ranges::begin(__base_);
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else
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return common_iterator<iterator_t<const _View>, sentinel_t<const _View>>(ranges::begin(__base_));
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}
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto end() {
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if constexpr (random_access_range<_View> && sized_range<_View>)
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return ranges::begin(__base_) + ranges::size(__base_);
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else
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return common_iterator<iterator_t<_View>, sentinel_t<_View>>(ranges::end(__base_));
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}
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto end() const requires range<const _View> {
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if constexpr (random_access_range<const _View> && sized_range<const _View>)
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return ranges::begin(__base_) + ranges::size(__base_);
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else
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return common_iterator<iterator_t<const _View>, sentinel_t<const _View>>(ranges::end(__base_));
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}
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto size() requires sized_range<_View> {
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return ranges::size(__base_);
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}
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto size() const requires sized_range<const _View> {
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return ranges::size(__base_);
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}
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};
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template<class _Range>
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common_view(_Range&&)
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-> common_view<views::all_t<_Range>>;
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template<class _View>
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inline constexpr bool enable_borrowed_range<common_view<_View>> = enable_borrowed_range<_View>;
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} // namespace ranges
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_COMMON_VIEW_H
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