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Diffstat (limited to 'libstdc++/include/debug/safe_sequence.h')
| -rw-r--r-- | libstdc++/include/debug/safe_sequence.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libstdc++/include/debug/safe_sequence.h b/libstdc++/include/debug/safe_sequence.h new file mode 100644 index 0000000..b5d6cce --- /dev/null +++ b/libstdc++/include/debug/safe_sequence.h @@ -0,0 +1,188 @@ +// Safe sequence implementation -*- C++ -*- + +// Copyright (C) 2003, 2004, 2005, 2006 +// 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +/** @file debug/safe_sequence.h + * This file is a GNU debug extension to the Standard C++ Library. + */ + +#ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_H +#define _GLIBCXX_DEBUG_SAFE_SEQUENCE_H 1 + +#include <debug/debug.h> +#include <debug/macros.h> +#include <debug/functions.h> +#include <debug/safe_base.h> + +namespace __gnu_debug +{ + template<typename _Iterator, typename _Sequence> + class _Safe_iterator; + + /** A simple function object that returns true if the passed-in + * value is not equal to the stored value. It saves typing over + * using both bind1st and not_equal. + */ + template<typename _Type> + class _Not_equal_to + { + _Type __value; + + public: + explicit _Not_equal_to(const _Type& __v) : __value(__v) { } + + bool + operator()(const _Type& __x) const + { return __value != __x; } + }; + + /** A function object that returns true when the given random access + iterator is at least @c n steps away from the given iterator. */ + template<typename _Iterator> + class _After_nth_from + { + typedef typename std::iterator_traits<_Iterator>::difference_type + difference_type; + + _Iterator _M_base; + difference_type _M_n; + + public: + _After_nth_from(const difference_type& __n, const _Iterator& __base) + : _M_base(__base), _M_n(__n) { } + + bool + operator()(const _Iterator& __x) const + { return __x - _M_base >= _M_n; } + }; + + /** + * @brief Base class for constructing a "safe" sequence type that + * tracks iterators that reference it. + * + * The class template %_Safe_sequence simplifies the construction of + * "safe" sequences that track the iterators that reference the + * sequence, so that the iterators are notified of changes in the + * sequence that may affect their operation, e.g., if the container + * invalidates its iterators or is destructed. This class template + * may only be used by deriving from it and passing the name of the + * derived class as its template parameter via the curiously + * recurring template pattern. The derived class must have @c + * iterator and @const_iterator types that are instantiations of + * class template _Safe_iterator for this sequence. Iterators will + * then be tracked automatically. + */ + template<typename _Sequence> + class _Safe_sequence : public _Safe_sequence_base + { + public: + /** Invalidates all iterators @c x that reference this sequence, + are not singular, and for which @c pred(x) returns @c + true. The user of this routine should be careful not to make + copies of the iterators passed to @p pred, as the copies may + interfere with the invalidation. */ + template<typename _Predicate> + void + _M_invalidate_if(_Predicate __pred); + + /** Transfers all iterators that reference this memory location + to this sequence from whatever sequence they are attached + to. */ + template<typename _Iterator> + void + _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x); + }; + + template<typename _Sequence> + template<typename _Predicate> + void + _Safe_sequence<_Sequence>:: + _M_invalidate_if(_Predicate __pred) + { + typedef typename _Sequence::iterator iterator; + typedef typename _Sequence::const_iterator const_iterator; + + __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex()); + for (_Safe_iterator_base* __iter = _M_iterators; __iter;) + { + iterator* __victim = static_cast<iterator*>(__iter); + __iter = __iter->_M_next; + if (!__victim->_M_singular()) + { + if (__pred(__victim->base())) + __victim->_M_invalidate_single(); + } + } + + for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;) + { + const_iterator* __victim = static_cast<const_iterator*>(__iter2); + __iter2 = __iter2->_M_next; + if (!__victim->_M_singular()) + { + if (__pred(__victim->base())) + __victim->_M_invalidate_single(); + } + } + } + + template<typename _Sequence> + template<typename _Iterator> + void + _Safe_sequence<_Sequence>:: + _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x) + { + _Safe_sequence_base* __from = __x._M_sequence; + if (!__from) + return; + + typedef typename _Sequence::iterator iterator; + typedef typename _Sequence::const_iterator const_iterator; + + __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex()); + for (_Safe_iterator_base* __iter = __from->_M_iterators; __iter;) + { + iterator* __victim = static_cast<iterator*>(__iter); + __iter = __iter->_M_next; + if (!__victim->_M_singular() && __victim->base() == __x.base()) + __victim->_M_attach_single(static_cast<_Sequence*>(this)); + } + + for (_Safe_iterator_base* __iter2 = __from->_M_const_iterators; + __iter2;) + { + const_iterator* __victim = static_cast<const_iterator*>(__iter2); + __iter2 = __iter2->_M_next; + if (!__victim->_M_singular() && __victim->base() == __x.base()) + __victim->_M_attach_single(static_cast<_Sequence*>(this)); + } + } +} // namespace __gnu_debug + +#endif |
