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1 // Safe sequence implementation -*- C++ -*-
3 // Copyright (C) 2003, 2004
4 // Free Software Foundation, Inc.
5 //
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)
10 // any later version.
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 // USA.
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/safe_base.h>
37 namespace __gnu_debug
39 template<typename _Iterator, typename _Sequence>
40 class _Safe_iterator;
42 /** A simple function object that returns true if the passed-in
43 * value is not equal to the stored value. It saves typing over
44 * using both bind1st and not_equal.
46 template<typename _Type>
47 class _Not_equal_to
49 _Type __value;
51 public:
52 explicit _Not_equal_to(const _Type& __v) : __value(__v) { }
54 bool
55 operator()(const _Type& __x) const
56 { return __value != __x; }
59 /** A function object that returns true when the given random access
60 iterator is at least @c n steps away from the given iterator. */
61 template<typename _Iterator>
62 class _After_nth_from
64 typedef typename std::iterator_traits<_Iterator>::difference_type
65 difference_type;
67 _Iterator _M_base;
68 difference_type _M_n;
70 public:
71 _After_nth_from(const difference_type& __n, const _Iterator& __base)
72 : _M_base(__base), _M_n(__n) { }
74 bool
75 operator()(const _Iterator& __x) const
76 { return __x - _M_base >= _M_n; }
79 /**
80 * @brief Base class for constructing a "safe" sequence type that
81 * tracks iterators that reference it.
83 * The class template %_Safe_sequence simplifies the construction of
84 * "safe" sequences that track the iterators that reference the
85 * sequence, so that the iterators are notified of changes in the
86 * sequence that may affect their operation, e.g., if the container
87 * invalidates its iterators or is destructed. This class template
88 * may only be used by deriving from it and passing the name of the
89 * derived class as its template parameter via the curiously
90 * recurring template pattern. The derived class must have @c
91 * iterator and @const_iterator types that are instantiations of
92 * class template _Safe_iterator for this sequence. Iterators will
93 * then be tracked automatically.
95 template<typename _Sequence>
96 class _Safe_sequence : public _Safe_sequence_base
98 public:
99 /** Invalidates all iterators @c x that reference this sequence,
100 are not singular, and for which @c pred(x) returns @c
101 true. The user of this routine should be careful not to make
102 copies of the iterators passed to @p pred, as the copies may
103 interfere with the invalidation. */
104 template<typename _Predicate>
105 void
106 _M_invalidate_if(_Predicate __pred);
108 /** Transfers all iterators that reference this memory location
109 to this sequence from whatever sequence they are attached
110 to. */
111 template<typename _Iterator>
112 void
113 _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x);
116 template<typename _Sequence>
117 template<typename _Predicate>
118 void
119 _Safe_sequence<_Sequence>::
120 _M_invalidate_if(_Predicate __pred)
122 typedef typename _Sequence::iterator iterator;
123 typedef typename _Sequence::const_iterator const_iterator;
125 for (_Safe_iterator_base* __iter = _M_iterators; __iter; )
127 iterator* __victim = static_cast<iterator*>(__iter);
128 __iter = __iter->_M_next;
129 if (!__victim->_M_singular())
131 if (__pred(__victim->base()))
132 __victim->_M_invalidate();
136 for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2; )
138 const_iterator* __victim = static_cast<const_iterator*>(__iter2);
139 __iter2 = __iter2->_M_next;
140 if (!__victim->_M_singular())
142 if (__pred(__victim->base()))
143 __victim->_M_invalidate();
148 template<typename _Sequence>
149 template<typename _Iterator>
150 void
151 _Safe_sequence<_Sequence>::
152 _M_transfer_iter(const _Safe_iterator<_Iterator, _Sequence>& __x)
154 _Safe_sequence_base* __from = __x._M_sequence;
155 if (!__from)
156 return;
158 typedef typename _Sequence::iterator iterator;
159 typedef typename _Sequence::const_iterator const_iterator;
161 for (_Safe_iterator_base* __iter = __from->_M_iterators; __iter; )
163 iterator* __victim = static_cast<iterator*>(__iter);
164 __iter = __iter->_M_next;
165 if (!__victim->_M_singular() && __victim->base() == __x.base())
166 __victim->_M_attach(static_cast<_Sequence*>(this));
169 for (_Safe_iterator_base* __iter2 = __from->_M_const_iterators;
170 __iter2;)
172 const_iterator* __victim = static_cast<const_iterator*>(__iter2);
173 __iter2 = __iter2->_M_next;
174 if (!__victim->_M_singular() && __victim->base() == __x.base())
175 __victim->_M_attach(static_cast<_Sequence*>(this));
178 } // namespace __gnu_debug
180 #endif