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_PUSH_MACROS
  21 #include <__undef_macros>
  22
  23 _LIBCPP_BEGIN_NAMESPACE_STD
  24
  25 template <class _ForwardIterator, class _Predicate>
  26 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
  27 remove_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