35 lines · c
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-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H11#define _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H12 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_header18#endif19 20_LIBCPP_BEGIN_NAMESPACE_STD21 22template <class _InputIterator, class _Predicate>23_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI typename iterator_traits<_InputIterator>::difference_type24count_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_STD33 34#endif // _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H35