73 lines
2.4 KiB
C++
73 lines
2.4 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_MIN_ELEMENT_H
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#define _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_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/forward.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 !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __min_element {
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struct __fn {
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template <class _Ip, class _Sp, class _Proj, class _Comp>
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_LIBCPP_HIDE_FROM_ABI static constexpr
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_Ip __go(_Ip __first, _Sp __last, _Comp& __comp, _Proj& __proj) {
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if (__first == __last)
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return __first;
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_Ip __i = __first;
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while (++__i != __last)
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if (std::invoke(__comp, std::invoke(__proj, *__i), std::invoke(__proj, *__first)))
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__first = __i;
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return __first;
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}
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template <forward_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity,
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indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
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_LIBCPP_HIDE_FROM_ABI constexpr
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_Ip operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
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return __go(__first, __last, __comp, __proj);
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}
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template <forward_range _Rp, class _Proj = identity,
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indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
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_LIBCPP_HIDE_FROM_ABI constexpr
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borrowed_iterator_t<_Rp> operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
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return __go(ranges::begin(__r), ranges::end(__r), __comp, __proj);
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}
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};
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} // namespace __min_element
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inline namespace __cpo {
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inline constexpr auto min_element = __min_element::__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 // !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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#endif // _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
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