73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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_IF_H
|
|
#define _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H
|
|
|
|
#include <__config>
|
|
#include <__functional/identity.h>
|
|
#include <__functional/invoke.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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
namespace ranges {
|
|
template <class _Iter, class _Sent, class _Proj, class _Pred>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr
|
|
iter_difference_t<_Iter> __count_if_impl(_Iter __first, _Sent __last,
|
|
_Pred& __pred, _Proj& __proj) {
|
|
iter_difference_t<_Iter> __counter(0);
|
|
for (; __first != __last; ++__first) {
|
|
if (std::invoke(__pred, std::invoke(__proj, *__first)))
|
|
++__counter;
|
|
}
|
|
return __counter;
|
|
}
|
|
|
|
namespace __count_if {
|
|
struct __fn {
|
|
template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Proj = identity,
|
|
indirect_unary_predicate<projected<_Iter, _Proj>> _Predicate>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr
|
|
iter_difference_t<_Iter> operator()(_Iter __first, _Sent __last, _Predicate __pred, _Proj __proj = {}) const {
|
|
return ranges::__count_if_impl(std::move(__first), std::move(__last), __pred, __proj);
|
|
}
|
|
|
|
template <input_range _Range, class _Proj = identity,
|
|
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Predicate>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr
|
|
range_difference_t<_Range> operator()(_Range&& __r, _Predicate __pred, _Proj __proj = {}) const {
|
|
return ranges::__count_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj);
|
|
}
|
|
};
|
|
} // namespace __count_if
|
|
|
|
inline namespace __cpo {
|
|
inline constexpr auto count_if = __count_if::__fn{};
|
|
} // namespace __cpo
|
|
} // namespace ranges
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
|
|
|
|
#endif // _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H
|