xref: /llvm-project/libcxx/include/__cxx03/__algorithm/ranges_count.h (revision ce7771902dc50d900de639d499a60486b83f70e0)

//===----------------------------------------------------------------------===//
//
// 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___CXX03___ALGORITHM_RANGES_COUNT_H
#define _LIBCPP___CXX03___ALGORITHM_RANGES_COUNT_H

#include <__cxx03/__algorithm/count.h>
#include <__cxx03/__algorithm/iterator_operations.h>
#include <__cxx03/__config>
#include <__cxx03/__functional/identity.h>
#include <__cxx03/__functional/ranges_operations.h>
#include <__cxx03/__iterator/concepts.h>
#include <__cxx03/__iterator/incrementable_traits.h>
#include <__cxx03/__iterator/iterator_traits.h>
#include <__cxx03/__iterator/projected.h>
#include <__cxx03/__ranges/access.h>
#include <__cxx03/__ranges/concepts.h>
#include <__cxx03/__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__cxx03/__undef_macros>

#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*>
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
  operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const {
    return std::__count<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __proj);
  }

  template <input_range _Range, class _Type, class _Proj = identity>
    requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range>
  operator()(_Range&& __r, const _Type& __value, _Proj __proj = {}) const {
    return std::__count<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), __value, __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

_LIBCPP_POP_MACROS

#endif // _LIBCPP___CXX03___ALGORITHM_RANGES_COUNT_H