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 <__config>
13 #include <__algorithm/find_if.h>
14 #include <utility>
15 #include <type_traits>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #pragma GCC system_header
19 #endif
20 
21 _LIBCPP_PUSH_MACROS
22 #include <__undef_macros>
23 
24 _LIBCPP_BEGIN_NAMESPACE_STD
25 
26 template <class _ForwardIterator, class _Predicate>
27 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
28 remove_if(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred)
29 {
30     __first = _VSTD::find_if<_ForwardIterator, typename add_lvalue_reference<_Predicate>::type>
31                            (__first, __last, __pred);
32     if (__first != __last)
33     {
34         _ForwardIterator __i = __first;
35         while (++__i != __last)
36         {
37             if (!__pred(*__i))
38             {
39                 *__first = _VSTD::move(*__i);
40                 ++__first;
41             }
42         }
43     }
44     return __first;
45 }
46 
47 _LIBCPP_END_NAMESPACE_STD
48 
49 _LIBCPP_POP_MACROS
50 
51 #endif // _LIBCPP___ALGORITHM_REMOVE_IF_H
52