libcxx/include/__algorithm/copy_if.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_COPY_IF_H
  10 #define _LIBCPP___ALGORITHM_COPY_IF_H
  11
  12 #include <__config>
  13
  14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  15 #  pragma GCC system_header
  16 #endif
  17
  18 _LIBCPP_BEGIN_NAMESPACE_STD
  19
  20 template<class _InputIterator, class _OutputIterator, class _Predicate>
  21 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  22 _OutputIterator
  23 copy_if(_InputIterator __first, _InputIterator __last,
  24         _OutputIterator __result, _Predicate __pred)
  25 {
  26     for (; __first != __last; ++__first)
  27     {
  28         if (__pred(*__first))
  29         {
  30             *__result = *__first;
  31             ++__result;
  32         }
  33     }
  34     return __result;
  35 }
  36
  37 _LIBCPP_END_NAMESPACE_STD
  38
  39 #endif // _LIBCPP___ALGORITHM_COPY_IF_H