1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___ALGORITHM_RANGES_COUNT_H
10#define _LIBCPP___ALGORITHM_RANGES_COUNT_H
11
12#include <__algorithm/count.h>
13#include <__algorithm/iterator_operations.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__functional/ranges_operations.h>
17#include <__iterator/concepts.h>
18#include <__iterator/incrementable_traits.h>
19#include <__iterator/iterator_traits.h>
20#include <__iterator/projected.h>
21#include <__ranges/access.h>
22#include <__ranges/concepts.h>
23#include <__utility/move.h>
24
25#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
26# pragma GCC system_header
27#endif
28
29_LIBCPP_PUSH_MACROS
30#include <__undef_macros>
31
32#if _LIBCPP_STD_VER >= 20
33
34_LIBCPP_BEGIN_NAMESPACE_STD
35
36namespace ranges {
37struct __count {
38 template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
39 requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
40 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
41 operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const {
42 return std::__count<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __proj);
43 }
44
45 template <input_range _Range, class _Type, class _Proj = identity>
46 requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
47 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range>
48 operator()(_Range&& __r, const _Type& __value, _Proj __proj = {}) const {
49 return std::__count<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), __value, __proj);
50 }
51};
52
53inline namespace __cpo {
54inline constexpr auto count = __count{};
55} // namespace __cpo
56} // namespace ranges
57
58_LIBCPP_END_NAMESPACE_STD
59
60#endif // _LIBCPP_STD_VER >= 20
61
62_LIBCPP_POP_MACROS
63
64#endif // _LIBCPP___ALGORITHM_RANGES_COUNT_H
65