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- // 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
-