mirror of
https://github.com/jart/cosmopolitan.git
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136 lines
4.7 KiB
C++
136 lines
4.7 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_DROP_WHILE_VIEW_H
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#define _LIBCPP___RANGES_DROP_WHILE_VIEW_H
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#include <__algorithm/ranges_find_if_not.h>
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#include <__assert>
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#include <__concepts/constructible.h>
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#include <__config>
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#include <__functional/bind_back.h>
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#include <__functional/reference_wrapper.h>
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#include <__iterator/concepts.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/movable_box.h>
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#include <__ranges/non_propagating_cache.h>
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#include <__ranges/range_adaptor.h>
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#include <__ranges/view_interface.h>
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#include <__type_traits/conditional.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/is_nothrow_constructible.h>
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#include <__type_traits/is_object.h>
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#include <__utility/forward.h>
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#include <__utility/in_place.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, class _Pred>
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requires input_range<_View> && is_object_v<_Pred> && indirect_unary_predicate<const _Pred, iterator_t<_View>>
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class _LIBCPP_ABI_LLVM18_NO_UNIQUE_ADDRESS drop_while_view : public view_interface<drop_while_view<_View, _Pred>> {
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public:
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_LIBCPP_HIDE_FROM_ABI drop_while_view()
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requires default_initializable<_View> && default_initializable<_Pred>
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= default;
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_LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 drop_while_view(_View __base, _Pred __pred)
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: __base_(std::move(__base)), __pred_(std::in_place, std::move(__pred)) {}
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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 const _Pred& pred() const { return *__pred_; }
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_LIBCPP_HIDE_FROM_ABI constexpr auto begin() {
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// Note: this duplicates a check in `optional` but provides a better error message.
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
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__pred_.__has_value(),
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"drop_while_view needs to have a non-empty predicate before calling begin() -- did a previous "
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"assignment to this drop_while_view fail?");
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if constexpr (_UseCache) {
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if (!__cached_begin_.__has_value()) {
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__cached_begin_.__emplace(ranges::find_if_not(__base_, std::cref(*__pred_)));
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}
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return *__cached_begin_;
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} else {
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return ranges::find_if_not(__base_, std::cref(*__pred_));
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}
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}
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_LIBCPP_HIDE_FROM_ABI constexpr auto end() { return ranges::end(__base_); }
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private:
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_LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
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_LIBCPP_NO_UNIQUE_ADDRESS __movable_box<_Pred> __pred_;
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static constexpr bool _UseCache = forward_range<_View>;
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using _Cache = _If<_UseCache, __non_propagating_cache<iterator_t<_View>>, __empty_cache>;
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_LIBCPP_NO_UNIQUE_ADDRESS _Cache __cached_begin_ = _Cache();
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};
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template <class _View, class _Pred>
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inline constexpr bool enable_borrowed_range<drop_while_view<_View, _Pred>> = enable_borrowed_range<_View>;
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template <class _Range, class _Pred>
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drop_while_view(_Range&&, _Pred) -> drop_while_view<views::all_t<_Range>, _Pred>;
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namespace views {
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namespace __drop_while {
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struct __fn {
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template <class _Range, class _Pred>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range, _Pred&& __pred) const
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noexcept(noexcept(/**/ drop_while_view(std::forward<_Range>(__range), std::forward<_Pred>(__pred))))
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-> decltype(/*--*/ drop_while_view(std::forward<_Range>(__range), std::forward<_Pred>(__pred))) {
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return /*-------------*/ drop_while_view(std::forward<_Range>(__range), std::forward<_Pred>(__pred));
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}
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template <class _Pred>
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requires constructible_from<decay_t<_Pred>, _Pred>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Pred&& __pred) const
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noexcept(is_nothrow_constructible_v<decay_t<_Pred>, _Pred>) {
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return __range_adaptor_closure_t(std::__bind_back(*this, std::forward<_Pred>(__pred)));
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}
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};
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} // namespace __drop_while
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inline namespace __cpo {
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inline constexpr auto drop_while = __drop_while::__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_DROP_WHILE_VIEW_H
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