mirror of
https://github.com/ziglang/zig.git
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138 lines
4.0 KiB
C++
Vendored
138 lines
4.0 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
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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_AS_RVALUE_H
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#define _LIBCPP___RANGES_AS_RVALUE_H
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#include <__concepts/constructible.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__iterator/move_iterator.h>
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#include <__iterator/move_sentinel.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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#if _LIBCPP_STD_VER >= 23
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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template <view _View>
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requires input_range<_View>
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class as_rvalue_view : public view_interface<as_rvalue_view<_View>> {
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_LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
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public:
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_LIBCPP_HIDE_FROM_ABI as_rvalue_view()
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requires default_initializable<_View>
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= default;
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_LIBCPP_HIDE_FROM_ABI constexpr explicit as_rvalue_view(_View __base) : __base_(std::move(__base)) {}
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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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requires(!__simple_view<_View>)
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{
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return move_iterator(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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return move_iterator(ranges::begin(__base_));
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}
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_LIBCPP_HIDE_FROM_ABI constexpr auto end()
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requires(!__simple_view<_View>)
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{
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if constexpr (common_range<_View>) {
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return move_iterator(ranges::end(__base_));
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} else {
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return move_sentinel(ranges::end(__base_));
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}
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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 (common_range<const _View>) {
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return move_iterator(ranges::end(__base_));
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} else {
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return move_sentinel(ranges::end(__base_));
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}
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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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as_rvalue_view(_Range&&) -> as_rvalue_view<views::all_t<_Range>>;
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template <class _View>
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inline constexpr bool enable_borrowed_range<as_rvalue_view<_View>> = enable_borrowed_range<_View>;
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namespace views {
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namespace __as_rvalue {
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struct __fn : __range_adaptor_closure<__fn> {
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template <class _Range>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range) const
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noexcept(noexcept(/**/ as_rvalue_view(std::forward<_Range>(__range))))
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-> decltype(/*--*/ as_rvalue_view(std::forward<_Range>(__range))) {
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return /*-------------*/ as_rvalue_view(std::forward<_Range>(__range));
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}
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template <class _Range>
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requires same_as<range_rvalue_reference_t<_Range>, range_reference_t<_Range>>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range) const
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noexcept(noexcept(/**/ views::all(std::forward<_Range>(__range))))
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-> 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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};
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} // namespace __as_rvalue
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inline namespace __cpo {
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constexpr auto as_rvalue = __as_rvalue::__fn{};
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} // namespace __cpo
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} // namespace views
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 23
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#endif // _LIBCPP___RANGES_AS_RVALUE_H
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