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// Safe container implementation -*- C++ -*-
// Copyright (C) 2014-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file debug/safe_container.h
* This file is a GNU debug extension to the Standard C++ Library.
*/
#ifndef _GLIBCXX_DEBUG_SAFE_CONTAINER_H
#define _GLIBCXX_DEBUG_SAFE_CONTAINER_H 1
#include <ext/alloc_traits.h>
namespace __gnu_debug
{
/// Safe class dealing with some allocator dependent operations.
template<typename _SafeContainer,
typename _Alloc,
template<typename> class _SafeBase,
bool _IsCxx11AllocatorAware = true>
class _Safe_container
: public _SafeBase<_SafeContainer>
{
typedef _SafeBase<_SafeContainer> _Base;
_SafeContainer&
_M_cont() _GLIBCXX_NOEXCEPT
{ return *static_cast<_SafeContainer*>(this); }
protected:
#if __cplusplus >= 201103L
_Safe_container() = default;
_Safe_container(const _Safe_container&) = default;
_Safe_container(_Safe_container&&) = default;
private:
_Safe_container(_Safe_container&& __x, const _Alloc&, std::true_type)
: _Safe_container(std::move(__x))
{ }
_Safe_container(_Safe_container&& __x, const _Alloc& __a, std::false_type)
: _Safe_container()
{
if (__x._M_cont().get_allocator() == __a)
_Base::_M_swap(__x);
else
__x._M_invalidate_all();
}
protected:
_Safe_container(_Safe_container&& __x, const _Alloc& __a)
: _Safe_container(std::move(__x), __a,
typename std::allocator_traits<_Alloc>::is_always_equal{})
{ }
#endif
// Copy assignment invalidate all iterators.
_Safe_container&
operator=(const _Safe_container&) _GLIBCXX_NOEXCEPT
{
this->_M_invalidate_all();
return *this;
}
#if __cplusplus >= 201103L
_Safe_container&
operator=(_Safe_container&& __x) noexcept
{
if (std::__addressof(__x) == this)
{
// Standard containers have a valid but unspecified value after
// self-move, so we invalidate all debug iterators even if the
// underlying container happens to preserve its contents.
this->_M_invalidate_all();
return *this;
}
if (_IsCxx11AllocatorAware)
{
typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits;
bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign()
|| _M_cont().get_allocator() == __x._M_cont().get_allocator();
if (__xfer_memory)
_Base::_M_swap(__x);
else
this->_M_invalidate_all();
}
else
_Base::_M_swap(__x);
__x._M_invalidate_all();
return *this;
}
void
_M_swap(_Safe_container& __x) noexcept
{
if (_IsCxx11AllocatorAware)
{
typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits;
if (!_Alloc_traits::_S_propagate_on_swap())
__glibcxx_check_equal_allocs(this->_M_cont()._M_base(),
__x._M_cont()._M_base());
}
_Base::_M_swap(__x);
}
#endif
};
} // namespace __gnu_debug
#endif
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