| // -*- 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_COUNT_IF_H |
| #define _LIBCPP___ALGORITHM_COUNT_IF_H |
| |
| #include <__config> |
| #include <__iterator/iterator_traits.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _InputIterator, class _Predicate> |
| _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| typename iterator_traits<_InputIterator>::difference_type |
| count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred) { |
| typename iterator_traits<_InputIterator>::difference_type __r(0); |
| for (; __first != __last; ++__first) |
| if (__pred(*__first)) |
| ++__r; |
| return __r; |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ALGORITHM_COUNT_IF_H |
