forked from OSchip/llvm-project
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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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___ALGORITHM_RANGES_FIND_IF_H
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#define _LIBCPP___ALGORITHM_RANGES_FIND_IF_H
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__functional/ranges_operations.h>
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#include <__iterator/concepts.h>
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#include <__iterator/projected.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__ranges/dangling.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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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template <class _Ip, class _Sp, class _Pred, class _Proj>
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_LIBCPP_HIDE_FROM_ABI static constexpr
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_Ip __find_if_impl(_Ip __first, _Sp __last, _Pred& __pred, _Proj& __proj) {
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for (; __first != __last; ++__first) {
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if (std::invoke(__pred, std::invoke(__proj, *__first)))
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break;
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}
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return __first;
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}
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namespace __find_if {
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struct __fn {
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template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity,
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indirect_unary_predicate<projected<_Ip, _Proj>> _Pred>
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_LIBCPP_HIDE_FROM_ABI constexpr
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_Ip operator()(_Ip __first, _Sp __last, _Pred __pred, _Proj __proj = {}) const {
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return ranges::__find_if_impl(std::move(__first), std::move(__last), __pred, __proj);
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}
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template <input_range _Rp, class _Proj = identity,
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indirect_unary_predicate<projected<iterator_t<_Rp>, _Proj>> _Pred>
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_LIBCPP_HIDE_FROM_ABI constexpr
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borrowed_iterator_t<_Rp> operator()(_Rp&& __r, _Pred __pred, _Proj __proj = {}) const {
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return ranges::__find_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj);
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}
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};
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} // namespace __find_if
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inline namespace __cpo {
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inline constexpr auto find_if = __find_if::__fn{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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#endif // _LIBCPP___ALGORITHM_RANGES_FIND_IF_H
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