186 lines
6.7 KiB
C++
186 lines
6.7 KiB
C++
// Safe container/iterator base implementation -*- C++ -*-
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// Copyright (C) 2011-2022 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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// 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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// 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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/** @file debug/safe_unordered_base.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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#ifndef _GLIBCXX_DEBUG_SAFE_UNORDERED_BASE_H
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#define _GLIBCXX_DEBUG_SAFE_UNORDERED_BASE_H 1
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#include <debug/safe_base.h>
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namespace __gnu_debug
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{
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class _Safe_unordered_container_base;
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/** \brief Basic functionality for a @a safe iterator.
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*
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* The %_Safe_local_iterator_base base class implements the functionality
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* of a safe local iterator that is not specific to a particular iterator
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* type. It contains a pointer back to the container it references
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* along with iterator version information and pointers to form a
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* doubly-linked list of local iterators referenced by the container.
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*
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* This class must not perform any operations that can throw an
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* exception, or the exception guarantees of derived iterators will
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* be broken.
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*/
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class _Safe_local_iterator_base : public _Safe_iterator_base
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{
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protected:
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/** Initializes the iterator and makes it singular. */
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_Safe_local_iterator_base()
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{ }
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/** Initialize the iterator to reference the container pointed to
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* by @p __seq. @p __constant is true when we are initializing a
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* constant local iterator, and false if it is a mutable local iterator.
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* Note that @p __seq may be NULL, in which case the iterator will be
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* singular. Otherwise, the iterator will reference @p __seq and
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* be nonsingular.
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*/
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_Safe_local_iterator_base(const _Safe_sequence_base* __seq, bool __constant)
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{ this->_M_attach(const_cast<_Safe_sequence_base*>(__seq), __constant); }
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/** Initializes the iterator to reference the same container that
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@p __x does. @p __constant is true if this is a constant
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iterator, and false if it is mutable. */
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_Safe_local_iterator_base(const _Safe_local_iterator_base& __x,
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bool __constant)
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{ this->_M_attach(__x._M_sequence, __constant); }
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~_Safe_local_iterator_base() { this->_M_detach(); }
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_Safe_unordered_container_base*
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_M_get_container() const noexcept;
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/** Attaches this iterator to the given container, detaching it
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* from whatever container it was attached to originally. If the
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* new container is the NULL pointer, the iterator is left
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* unattached.
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*/
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void
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_M_attach(_Safe_sequence_base* __seq, bool __constant);
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/** Likewise, but not thread-safe. */
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void
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_M_attach_single(_Safe_sequence_base* __seq, bool __constant) throw ();
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/** Detach the iterator for whatever container it is attached to,
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* if any.
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*/
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void
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_M_detach();
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/** Likewise, but not thread-safe. */
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void
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_M_detach_single() throw ();
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};
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/**
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* @brief Base class that supports tracking of local iterators that
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* reference an unordered container.
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*
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* The %_Safe_unordered_container_base class provides basic support for
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* tracking iterators into an unordered container. Containers that track
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* iterators must derived from %_Safe_unordered_container_base publicly, so
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* that safe iterators (which inherit _Safe_iterator_base) can
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* attach to them. This class contains four linked lists of
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* iterators, one for constant iterators, one for mutable
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* iterators, one for constant local iterators, one for mutable local
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* iterators and a version number that allows very fast
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* invalidation of all iterators that reference the container.
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*
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* This class must ensure that no operation on it may throw an
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* exception, otherwise @a safe containers may fail to provide the
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* exception-safety guarantees required by the C++ standard.
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*/
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class _Safe_unordered_container_base : public _Safe_sequence_base
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{
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friend class _Safe_local_iterator_base;
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typedef _Safe_sequence_base _Base;
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public:
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/// The list of mutable local iterators that reference this container
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_Safe_iterator_base* _M_local_iterators;
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/// The list of constant local iterators that reference this container
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_Safe_iterator_base* _M_const_local_iterators;
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protected:
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// Initialize with a version number of 1 and no iterators
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_Safe_unordered_container_base() noexcept
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: _M_local_iterators(nullptr), _M_const_local_iterators(nullptr)
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{ }
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// Copy constructor does not copy iterators.
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_Safe_unordered_container_base(const _Safe_unordered_container_base&)
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noexcept
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: _Safe_unordered_container_base() { }
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// When moved unordered containers iterators are swapped.
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_Safe_unordered_container_base(_Safe_unordered_container_base&& __x)
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noexcept
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: _Safe_unordered_container_base()
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{ this->_M_swap(__x); }
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/** Notify all iterators that reference this container that the
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container is being destroyed. */
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~_Safe_unordered_container_base() noexcept
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{ this->_M_detach_all(); }
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/** Detach all iterators, leaving them singular. */
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void
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_M_detach_all();
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/** Swap this container with the given container. This operation
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* also swaps ownership of the iterators, so that when the
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* operation is complete all iterators that originally referenced
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* one container now reference the other container.
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*/
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void
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_M_swap(_Safe_unordered_container_base& __x) noexcept;
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private:
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/** Attach an iterator to this container. */
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void
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_M_attach_local(_Safe_iterator_base* __it, bool __constant);
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/** Likewise but not thread safe. */
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void
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_M_attach_local_single(_Safe_iterator_base* __it, bool __constant) throw ();
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/** Detach an iterator from this container */
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void
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_M_detach_local(_Safe_iterator_base* __it);
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/** Likewise but not thread safe. */
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void
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_M_detach_local_single(_Safe_iterator_base* __it) throw ();
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};
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} // namespace __gnu_debug
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#endif
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