libcxx/include/__iterator/erase_if_container.h

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef _LIBCPP___ITERATOR_ERASE_IF_CONTAINER_H
  11 #define _LIBCPP___ITERATOR_ERASE_IF_CONTAINER_H
  12
  13 #include <__config>
  14
  15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  16 #  pragma GCC system_header
  17 #endif
  18
  19 _LIBCPP_PUSH_MACROS
  20 #include <__undef_macros>
  21
  22 _LIBCPP_BEGIN_NAMESPACE_STD
  23
  24 template <class _Container, class _Predicate>
  25 _LIBCPP_HIDE_FROM_ABI
  26 typename _Container::size_type
  27 __libcpp_erase_if_container(_Container& __c, _Predicate& __pred) {
  28   typename _Container::size_type __old_size = __c.size();
  29
  30   const typename _Container::iterator __last = __c.end();
  31   for (typename _Container::iterator __iter = __c.begin(); __iter != __last;) {
  32     if (__pred(*__iter))
  33       __iter = __c.erase(__iter);
  34     else
  35       ++__iter;
  36   }
  37
  38   return __old_size - __c.size();
  39 }
  40
  41 _LIBCPP_END_NAMESPACE_STD
  42
  43 _LIBCPP_POP_MACROS
  44
  45 #endif // _LIBCPP___ITERATOR_ERASE_IF_CONTAINER_H