libcxx/include/__algorithm/partition_copy.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_PARTITION_COPY_H
  10 #define _LIBCPP___ALGORITHM_PARTITION_COPY_H
  11
  12 #include <__config>
  13 #include <__iterator/iterator_traits.h>
  14 #include <__utility/pair.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
  22 template <class _InputIterator, class _OutputIterator1,
  23           class _OutputIterator2, class _Predicate>
  24 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_OutputIterator1, _OutputIterator2>
  25 partition_copy(_InputIterator __first, _InputIterator __last,
  26                _OutputIterator1 __out_true, _OutputIterator2 __out_false,
  27                _Predicate __pred)
  28 {
  29     for (; __first != __last; ++__first)
  30     {
  31         if (__pred(*__first))
  32         {
  33             *__out_true = *__first;
  34             ++__out_true;
  35         }
  36         else
  37         {
  38             *__out_false = *__first;
  39             ++__out_false;
  40         }
  41     }
  42     return pair<_OutputIterator1, _OutputIterator2>(__out_true, __out_false);
  43 }
  44
  45 _LIBCPP_END_NAMESPACE_STD
  46
  47 #endif // _LIBCPP___ALGORITHM_PARTITION_COPY_H