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Diffstat (limited to 'gcc-4.9/libstdc++-v3/include/debug/safe_unordered_base.h')
| -rw-r--r-- | gcc-4.9/libstdc++-v3/include/debug/safe_unordered_base.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/gcc-4.9/libstdc++-v3/include/debug/safe_unordered_base.h b/gcc-4.9/libstdc++-v3/include/debug/safe_unordered_base.h new file mode 100644 index 0000000..bbb274f --- /dev/null +++ b/gcc-4.9/libstdc++-v3/include/debug/safe_unordered_base.h @@ -0,0 +1,185 @@ +// Safe container/iterator base implementation -*- C++ -*- + +// Copyright (C) 2011-2014 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_unordered_base.h + * This file is a GNU debug extension to the Standard C++ Library. + */ + +#ifndef _GLIBCXX_DEBUG_SAFE_UNORDERED_BASE_H +#define _GLIBCXX_DEBUG_SAFE_UNORDERED_BASE_H 1 + +#include <debug/safe_base.h> + +namespace __gnu_debug +{ + class _Safe_unordered_container_base; + + /** \brief Basic functionality for a @a safe iterator. + * + * The %_Safe_local_iterator_base base class implements the functionality + * of a safe local iterator that is not specific to a particular iterator + * type. It contains a pointer back to the container it references + * along with iterator version information and pointers to form a + * doubly-linked list of local iterators referenced by the container. + * + * This class must not perform any operations that can throw an + * exception, or the exception guarantees of derived iterators will + * be broken. + */ + class _Safe_local_iterator_base : public _Safe_iterator_base + { + protected: + /** Initializes the iterator and makes it singular. */ + _Safe_local_iterator_base() + { } + + /** Initialize the iterator to reference the container pointed to + * by @p __seq. @p __constant is true when we are initializing a + * constant local iterator, and false if it is a mutable local iterator. + * Note that @p __seq may be NULL, in which case the iterator will be + * singular. Otherwise, the iterator will reference @p __seq and + * be nonsingular. + */ + _Safe_local_iterator_base(const _Safe_sequence_base* __seq, bool __constant) + { this->_M_attach(const_cast<_Safe_sequence_base*>(__seq), __constant); } + + /** Initializes the iterator to reference the same container that + @p __x does. @p __constant is true if this is a constant + iterator, and false if it is mutable. */ + _Safe_local_iterator_base(const _Safe_local_iterator_base& __x, + bool __constant) + { this->_M_attach(__x._M_sequence, __constant); } + + _Safe_local_iterator_base& + operator=(const _Safe_local_iterator_base&); + + explicit + _Safe_local_iterator_base(const _Safe_local_iterator_base&); + + ~_Safe_local_iterator_base() { this->_M_detach(); } + + _Safe_unordered_container_base* + _M_get_container() const _GLIBCXX_NOEXCEPT; + + public: + /** Attaches this iterator to the given container, detaching it + * from whatever container it was attached to originally. If the + * new container is the NULL pointer, the iterator is left + * unattached. + */ + void _M_attach(_Safe_sequence_base* __seq, bool __constant); + + /** Likewise, but not thread-safe. */ + void _M_attach_single(_Safe_sequence_base* __seq, bool __constant) throw (); + + /** Detach the iterator for whatever container it is attached to, + * if any. + */ + void _M_detach(); + + /** Likewise, but not thread-safe. */ + void _M_detach_single() throw (); + }; + + /** + * @brief Base class that supports tracking of local iterators that + * reference an unordered container. + * + * The %_Safe_unordered_container_base class provides basic support for + * tracking iterators into an unordered container. Containers that track + * iterators must derived from %_Safe_unordered_container_base publicly, so + * that safe iterators (which inherit _Safe_iterator_base) can + * attach to them. This class contains four linked lists of + * iterators, one for constant iterators, one for mutable + * iterators, one for constant local iterators, one for mutable local + * iterators and a version number that allows very fast + * invalidation of all iterators that reference the container. + * + * This class must ensure that no operation on it may throw an + * exception, otherwise @a safe containers may fail to provide the + * exception-safety guarantees required by the C++ standard. + */ + class _Safe_unordered_container_base : public _Safe_sequence_base + { + typedef _Safe_sequence_base _Base; + public: + /// The list of mutable local iterators that reference this container + _Safe_iterator_base* _M_local_iterators; + + /// The list of constant local iterators that reference this container + _Safe_iterator_base* _M_const_local_iterators; + + protected: + // Initialize with a version number of 1 and no iterators + _Safe_unordered_container_base() + : _M_local_iterators(nullptr), _M_const_local_iterators(nullptr) + { } + + // Initialize with a version number of 1 and no iterators + _Safe_unordered_container_base(const _Safe_unordered_container_base&) + noexcept + : _Safe_unordered_container_base() { } + + _Safe_unordered_container_base(_Safe_unordered_container_base&& __x) + noexcept + : _Safe_unordered_container_base() + { this->_M_swap(__x); } + + /** Notify all iterators that reference this container that the + container is being destroyed. */ + ~_Safe_unordered_container_base() + { this->_M_detach_all(); } + + /** Detach all iterators, leaving them singular. */ + void + _M_detach_all(); + + /** Swap this container with the given container. This operation + * also swaps ownership of the iterators, so that when the + * operation is complete all iterators that originally referenced + * one container now reference the other container. + */ + void + _M_swap(_Safe_unordered_container_base& __x); + + public: + /** Attach an iterator to this container. */ + void + _M_attach_local(_Safe_iterator_base* __it, bool __constant); + + /** Likewise but not thread safe. */ + void + _M_attach_local_single(_Safe_iterator_base* __it, bool __constant) throw (); + + /** Detach an iterator from this container */ + void + _M_detach_local(_Safe_iterator_base* __it); + + /** Likewise but not thread safe. */ + void + _M_detach_local_single(_Safe_iterator_base* __it) throw (); + }; +} // namespace __gnu_debug + +#endif |