xref: /freebsd/contrib/llvm-project/libcxx/include/__algorithm/partition_copy.h (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5)
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_CONSTEXPR_AFTER_CXX17 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
48