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_REMOVE_IF_H
10 #define _LIBCPP___ALGORITHM_REMOVE_IF_H
11 
12 #include <__algorithm/find_if.h>
13 #include <__config>
14 #include <__utility/move.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 _ForwardIterator, class _Predicate>
23 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
24 remove_if(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred)
25 {
26     __first = _VSTD::find_if<_ForwardIterator, _Predicate&>(__first, __last, __pred);
27     if (__first != __last)
28     {
29         _ForwardIterator __i = __first;
30         while (++__i != __last)
31         {
32             if (!__pred(*__i))
33             {
34                 *__first = _VSTD::move(*__i);
35                 ++__first;
36             }
37         }
38     }
39     return __first;
40 }
41 
42 _LIBCPP_END_NAMESPACE_STD
43 
44 #endif // _LIBCPP___ALGORITHM_REMOVE_IF_H
45