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d10dc5a06f
We originally put implementation-detail function objects into individual namespaces for `std::ranges` without a good reason for doing so. This practice was continued, presumably because there was prior art. Since there's no reason to keep these namespaces, this commit removes them, which will slightly impact binary size. This commit does not apply to CPOs, some of which need additional work.
80 lines
2.6 KiB
C++
80 lines
2.6 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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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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// TODO(ranges): `ranges::min_element` can now simply delegate to `std::__min_element`.
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template <class _Ip, class _Sp, class _Proj, class _Comp>
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_LIBCPP_HIDE_FROM_ABI constexpr _Ip __min_element_impl(_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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struct __min_element {
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template <forward_iterator _Ip,
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sentinel_for<_Ip> _Sp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip
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operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
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return ranges::__min_element_impl(__first, __last, __comp, __proj);
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}
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template <forward_range _Rp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp>
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operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
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return ranges::__min_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
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}
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};
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inline namespace __cpo {
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inline constexpr auto min_element = __min_element{};
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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 >= 20
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
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