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, class _OutputIterator2, class _Predicate>
  23 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_OutputIterator1, _OutputIterator2> partition_copy(
  24     _InputIterator __first,
  25     _InputIterator __last,
  26     _OutputIterator1 __out_true,
  27     _OutputIterator2 __out_false,
  28     _Predicate __pred) {
  29   for (; __first != __last; ++__first) {
  30     if (__pred(*__first)) {
  31       *__out_true = *__first;
  32       ++__out_true;
  33     } else {
  34       *__out_false = *__first;
  35       ++__out_false;
  36     }
  37   }
  38   return pair<_OutputIterator1, _OutputIterator2>(__out_true, __out_false);
  39 }
  40
  41 _LIBCPP_END_NAMESPACE_STD
  42
  43 #endif // _LIBCPP___ALGORITHM_PARTITION_COPY_H