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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_RANGES_COUNT_H
#define _LIBCPP___ALGORITHM_RANGES_COUNT_H
#include <__algorithm/ranges_count_if.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/incrementable_traits.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/projected.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
namespace __count {
struct __fn {
template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const {
auto __pred = [&](auto&& __e) { return __e == __value; };
return ranges::__count_if_impl(std::move(__first), std::move(__last), __pred, __proj);
}
template <input_range _Range, class _Type, class _Proj = identity>
requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range>
operator()(_Range&& __r, const _Type& __value, _Proj __proj = {}) const {
auto __pred = [&](auto&& __e) { return __e == __value; };
return ranges::__count_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj);
}
};
} // namespace __count
inline namespace __cpo {
inline constexpr auto count = __count::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 20
#endif // _LIBCPP___ALGORITHM_RANGES_COUNT_H
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