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.
78 lines
2.5 KiB
C++
78 lines
2.5 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_COUNT_IF_H
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#define _LIBCPP___ALGORITHM_RANGES_COUNT_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/incrementable_traits.h>
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#include <__iterator/iterator_traits.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 <__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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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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template <class _Iter, class _Sent, class _Proj, class _Pred>
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_LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
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__count_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
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iter_difference_t<_Iter> __counter(0);
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for (; __first != __last; ++__first) {
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if (std::invoke(__pred, std::invoke(__proj, *__first)))
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++__counter;
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}
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return __counter;
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}
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struct __count_if {
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template <input_iterator _Iter,
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sentinel_for<_Iter> _Sent,
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class _Proj = identity,
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indirect_unary_predicate<projected<_Iter, _Proj>> _Predicate>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
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operator()(_Iter __first, _Sent __last, _Predicate __pred, _Proj __proj = {}) const {
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return ranges::__count_if_impl(std::move(__first), std::move(__last), __pred, __proj);
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}
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template <input_range _Range,
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class _Proj = identity,
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indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Predicate>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range>
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operator()(_Range&& __r, _Predicate __pred, _Proj __proj = {}) const {
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return ranges::__count_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj);
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}
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};
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inline namespace __cpo {
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inline constexpr auto count_if = __count_if{};
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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_COUNT_IF_H
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