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_PUSH_MACROS
21#include <__undef_macros>
22
23_LIBCPP_BEGIN_NAMESPACE_STD
24
25template <class _ForwardIterator, class _Predicate>
26[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
27remove_if(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
28  __first = std::find_if<_ForwardIterator, _Predicate&>(__first, __last, __pred);
29  if (__first != __last) {
30    _ForwardIterator __i = __first;
31    while (++__i != __last) {
32      if (!__pred(*__i)) {
33        *__first = std::move(*__i);
34        ++__first;
35      }
36    }
37  }
38  return __first;
39}
40
41_LIBCPP_END_NAMESPACE_STD
42
43_LIBCPP_POP_MACROS
44
45#endif // _LIBCPP___ALGORITHM_REMOVE_IF_H