mirror of
https://github.com/jart/cosmopolitan.git
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142 lines
4.3 KiB
C++
142 lines
4.3 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 <__concepts/constructible.h>
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#include <__concepts/copyable.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/range_adaptor.h>
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#include <__ranges/size.h>
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#include <__ranges/view_interface.h>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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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 common_view()
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requires default_initializable<_View>
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= default;
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_LIBCPP_HIDE_FROM_ABI constexpr explicit common_view(_View __v) : __base_(std::move(__v)) {}
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_LIBCPP_HIDE_FROM_ABI constexpr _View base() const&
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requires copy_constructible<_View>
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{
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return __base_;
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}
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_LIBCPP_HIDE_FROM_ABI constexpr _View base() && { return std::move(__base_); }
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_LIBCPP_HIDE_FROM_ABI 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 constexpr auto begin() const
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requires range<const _View>
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{
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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 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 constexpr auto end() const
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requires range<const _View>
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{
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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 constexpr auto size()
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requires sized_range<_View>
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{
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return ranges::size(__base_);
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}
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_LIBCPP_HIDE_FROM_ABI constexpr auto size() const
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requires sized_range<const _View>
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{
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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&&) -> 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 views {
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namespace __common {
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struct __fn : __range_adaptor_closure<__fn> {
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template <class _Range>
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requires common_range<_Range>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range) const noexcept(
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noexcept(views::all(std::forward<_Range>(__range)))) -> decltype(views::all(std::forward<_Range>(__range))) {
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return views::all(std::forward<_Range>(__range));
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}
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template <class _Range>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range) const noexcept(noexcept(common_view{
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std::forward<_Range>(__range)})) -> decltype(common_view{std::forward<_Range>(__range)}) {
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return common_view{std::forward<_Range>(__range)};
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}
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};
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} // namespace __common
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inline namespace __cpo {
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inline constexpr auto common = __common::__fn{};
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} // namespace __cpo
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} // namespace views
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANGES_COMMON_VIEW_H
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