// Safe sequence implementation -*- C++ -*- // Copyright (C) 2003, 2004 // 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // 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. #ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_H #define _GLIBCXX_DEBUG_SAFE_SEQUENCE_H 1 #include <debug/debug.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; 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(); } } 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(); } } } 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; 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(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(static_cast<_Sequence*>(this)); } } } // namespace __gnu_debug #endif