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// Safe container implementation -*- C++ -*- |
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// Copyright (C) 2014-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file debug/safe_container.h |
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* This file is a GNU debug extension to the Standard C++ Library. |
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*/ |
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|
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#ifndef _GLIBCXX_DEBUG_SAFE_CONTAINER_H |
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#define _GLIBCXX_DEBUG_SAFE_CONTAINER_H 1 |
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|
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#include <ext/alloc_traits.h> |
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|
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namespace __gnu_debug |
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{ |
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/// Safe class dealing with some allocator dependent operations. |
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template<typename _SafeContainer, |
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typename _Alloc, |
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template<typename> class _SafeBase, |
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bool _IsCxx11AllocatorAware = true> |
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class _Safe_container |
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: public _SafeBase<_SafeContainer> |
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{ |
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typedef _SafeBase<_SafeContainer> _Base; |
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|
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_SafeContainer& |
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_M_cont() _GLIBCXX_NOEXCEPT |
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{ return *static_cast<_SafeContainer*>(this); } |
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|
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protected: |
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_Safe_container& |
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_M_safe() _GLIBCXX_NOEXCEPT |
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{ return *this; } |
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|
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#if __cplusplus >= 201103L |
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_Safe_container() = default; |
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_Safe_container(const _Safe_container&) = default; |
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_Safe_container(_Safe_container&&) = default; |
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|
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_Safe_container(_Safe_container&& __x, const _Alloc& __a) |
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: _Safe_container() |
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{ |
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if (__x._M_cont().get_allocator() == __a) |
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_Base::_M_swap(__x); |
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else |
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__x._M_invalidate_all(); |
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} |
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#endif |
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|
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public: |
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// Copy assignment invalidate all iterators. |
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_Safe_container& |
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operator=(const _Safe_container&) _GLIBCXX_NOEXCEPT |
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{ |
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this->_M_invalidate_all(); |
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return *this; |
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} |
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|
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#if __cplusplus >= 201103L |
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_Safe_container& |
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operator=(_Safe_container&& __x) noexcept |
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{ |
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if (std::__addressof(__x) == this) |
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{ |
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// Standard containers have a valid but unspecified value after |
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// self-move, so we invalidate all debug iterators even if the |
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// underlying container happens to preserve its contents. |
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this->_M_invalidate_all(); |
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return *this; |
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} |
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|
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if (_IsCxx11AllocatorAware) |
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{ |
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typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; |
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|
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bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign() |
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|| _M_cont().get_allocator() == __x._M_cont().get_allocator(); |
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if (__xfer_memory) |
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_Base::_M_swap(__x); |
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else |
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this->_M_invalidate_all(); |
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} |
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else |
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_Base::_M_swap(__x); |
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|
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__x._M_invalidate_all(); |
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return *this; |
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} |
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|
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void |
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_M_swap(_Safe_container& __x) noexcept |
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{ |
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if (_IsCxx11AllocatorAware) |
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{ |
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typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; |
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|
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if (!_Alloc_traits::_S_propagate_on_swap()) |
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__glibcxx_check_equal_allocs(this->_M_cont()._M_base(), |
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__x._M_cont()._M_base()); |
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} |
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|
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_Base::_M_swap(__x); |
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} |
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#endif |
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}; |
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|
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} // namespace __gnu_debug |
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|
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#endif |
