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1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H
11#define _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H
12
13#include <__cxx03/__config>
14#include <__cxx03/__iterator/iterator_traits.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22template <class _InputIterator, class _Predicate>
23_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI typename iterator_traits<_InputIterator>::difference_type
24count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred) {
25 typename iterator_traits<_InputIterator>::difference_type __r(0);
26 for (; __first != __last; ++__first)
27 if (__pred(*__first))
28 ++__r;
29 return __r;
30}
31
32_LIBCPP_END_NAMESPACE_STD
33
34#endif // _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H
35

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source code of libcxx/include/__cxx03/__algorithm/count_if.h