1 // Safe sequence implementation -*- C++ -*-
3 // Copyright (C) 2003, 2004, 2005
4 // Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 2, or (at your option)
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING. If not, write to the Free
19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
31 #ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_H
32 #define _GLIBCXX_DEBUG_SAFE_SEQUENCE_H 1
34 #include <debug/debug.h>
35 #include <debug/macros.h>
36 #include <debug/functions.h>
37 #include <debug/safe_base.h>
43 template<typename _Iterator, typename _Sequence>
46 /** A simple function object that returns true if the passed-in
47 * value is not equal to the stored value. It saves typing over
48 * using both bind1st and not_equal.
50 template<typename _Type>
56 explicit _Not_equal_to(const _Type& __v) : __value(__v) { }
59 operator()(const _Type& __x) const
60 { return __value != __x; }
63 /** A function object that returns true when the given random access
64 iterator is at least @c n steps away from the given iterator. */
65 template<typename _Iterator>
68 typedef typename std::iterator_traits<_Iterator>::difference_type
75 _After_nth_from(const difference_type& __n, const _Iterator& __base)
76 : _M_base(__base), _M_n(__n) { }
79 operator()(const _Iterator& __x) const
80 { return __x - _M_base >= _M_n; }
84 * @brief Base class for constructing a "safe" sequence type that
85 * tracks iterators that reference it.
87 * The class template %_Safe_sequence simplifies the construction of
88 * "safe" sequences that track the iterators that reference the
89 * sequence, so that the iterators are notified of changes in the
90 * sequence that may affect their operation, e.g., if the container
91 * invalidates its iterators or is destructed. This class template
92 * may only be used by deriving from it and passing the name of the
93 * derived class as its template parameter via the curiously
94 * recurring template pattern. The derived class must have @c
95 * iterator and @const_iterator types that are instantiations of
96 * class template _Safe_iterator for this sequence. Iterators will
97 * then be tracked automatically.
99 template<typename _Sequence>
100 class _Safe_sequence : public _Safe_sequence_base
103 /** Invalidates all iterators @c x that reference this sequence,
104 are not singular, and for which @c pred(x) returns @c
105 true. The user of this routine should be careful not to make
106 copies of the iterators passed to @p pred, as the copies may
107 interfere with the invalidation. */
108 template<typename _Predicate>
110 _M_invalidate_if(_Predicate __pred);
112 /** Transfers all iterators that reference this memory location
113 to this sequence from whatever sequence they are attached
115 template<typename _Iterator>
117 _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x);
120 template<typename _Sequence>
121 template<typename _Predicate>
123 _Safe_sequence<_Sequence>::
124 _M_invalidate_if(_Predicate __pred)
126 typedef typename _Sequence::iterator iterator;
127 typedef typename _Sequence::const_iterator const_iterator;
129 for (_Safe_iterator_base* __iter = _M_iterators; __iter; )
131 iterator* __victim = static_cast<iterator*>(__iter);
132 __iter = __iter->_M_next;
133 if (!__victim->_M_singular())
135 if (__pred(__victim->base()))
136 __victim->_M_invalidate();
140 for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2; )
142 const_iterator* __victim = static_cast<const_iterator*>(__iter2);
143 __iter2 = __iter2->_M_next;
144 if (!__victim->_M_singular())
146 if (__pred(__victim->base()))
147 __victim->_M_invalidate();
152 template<typename _Sequence>
153 template<typename _Iterator>
155 _Safe_sequence<_Sequence>::
156 _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x)
158 _Safe_sequence_base* __from = __x._M_sequence;
162 typedef typename _Sequence::iterator iterator;
163 typedef typename _Sequence::const_iterator const_iterator;
165 for (_Safe_iterator_base* __iter = __from->_M_iterators; __iter; )
167 iterator* __victim = static_cast<iterator*>(__iter);
168 __iter = __iter->_M_next;
169 if (!__victim->_M_singular() && __victim->base() == __x.base())
170 __victim->_M_attach(static_cast<_Sequence*>(this));
173 for (_Safe_iterator_base* __iter2 = __from->_M_const_iterators;
176 const_iterator* __victim = static_cast<const_iterator*>(__iter2);
177 __iter2 = __iter2->_M_next;
178 if (!__victim->_M_singular() && __victim->base() == __x.base())
179 __victim->_M_attach(static_cast<_Sequence*>(this));
182 } // namespace __gnu_debug