libcxx/include/__algorithm/remove_if.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_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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _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