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0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008 
0009 #ifndef _LIBCPP___CXX03___ALGORITHM_RANGES_COUNT_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_COUNT_H
0011 
0012 #include <__cxx03/__algorithm/count.h>
0013 #include <__cxx03/__algorithm/iterator_operations.h>
0014 #include <__cxx03/__config>
0015 #include <__cxx03/__functional/identity.h>
0016 #include <__cxx03/__functional/ranges_operations.h>
0017 #include <__cxx03/__iterator/concepts.h>
0018 #include <__cxx03/__iterator/incrementable_traits.h>
0019 #include <__cxx03/__iterator/iterator_traits.h>
0020 #include <__cxx03/__iterator/projected.h>
0021 #include <__cxx03/__ranges/access.h>
0022 #include <__cxx03/__ranges/concepts.h>
0023 #include <__cxx03/__utility/move.h>
0024 
0025 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0026 #  pragma GCC system_header
0027 #endif
0028 
0029 _LIBCPP_PUSH_MACROS
0030 #include <__cxx03/__undef_macros>
0031 
0032 #if _LIBCPP_STD_VER >= 20
0033 
0034 _LIBCPP_BEGIN_NAMESPACE_STD
0035 
0036 namespace ranges {
0037 namespace __count {
0038 struct __fn {
0039   template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
0040     requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
0041   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter>
0042   operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const {
0043     return std::__count<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __proj);
0044   }
0045 
0046   template <input_range _Range, class _Type, class _Proj = identity>
0047     requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
0048   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range>
0049   operator()(_Range&& __r, const _Type& __value, _Proj __proj = {}) const {
0050     return std::__count<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), __value, __proj);
0051   }
0052 };
0053 } // namespace __count
0054 
0055 inline namespace __cpo {
0056 inline constexpr auto count = __count::__fn{};
0057 } // namespace __cpo
0058 } // namespace ranges
0059 
0060 _LIBCPP_END_NAMESPACE_STD
0061 
0062 #endif // _LIBCPP_STD_VER >= 20
0063 
0064 _LIBCPP_POP_MACROS
0065 
0066 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_COUNT_H