1 // -*- c++ -*-
2 /*
3 * Copyright 2002, The libsigc++ Development Team
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21 #include <sigc++/trackable.h>
22 #include <iostream>
23
24 SIGC_USING_STD(ostream)
25
26 using namespace std;
27
28 namespace sigc
29 {
30
trackable()31 trackable::trackable()
32 : callback_list_(0)
33 {}
34
35 /* Don't copy the notification list.
36 The objects watching src don't need to be notified when the new object dies. */
trackable(const trackable &)37 trackable::trackable(const trackable& /*src*/)
38 : callback_list_(0)
39 {}
40
operator =(const trackable & src)41 trackable& trackable::operator=(const trackable& src)
42 {
43 if(this != &src)
44 notify_callbacks(); //Make sure that we have finished with existing stuff before replacing it.
45
46 return *this;
47 }
48
~trackable()49 trackable::~trackable()
50 {
51 notify_callbacks();
52 }
53
add_destroy_notify_callback(void * data,func_destroy_notify func) const54 void trackable::add_destroy_notify_callback(void* data, func_destroy_notify func) const
55 {
56 callback_list()->add_callback(data, func);
57 }
58
remove_destroy_notify_callback(void * data) const59 void trackable::remove_destroy_notify_callback(void* data) const
60 {
61 callback_list()->remove_callback(data);
62 }
63
notify_callbacks()64 void trackable::notify_callbacks()
65 {
66 if (callback_list_)
67 delete callback_list_; //This invokes all of the callbacks.
68
69 callback_list_ = 0;
70 }
71
callback_list() const72 internal::trackable_callback_list* trackable::callback_list() const
73 {
74 if (!callback_list_)
75 callback_list_ = new internal::trackable_callback_list;
76
77 return callback_list_;
78 }
79
80
81 namespace internal
82 {
83
~trackable_callback_list()84 trackable_callback_list::~trackable_callback_list()
85 {
86 clearing_ = true;
87
88 for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
89 (*i).func_((*i).data_);
90 }
91
add_callback(void * data,func_destroy_notify func)92 void trackable_callback_list::add_callback(void* data, func_destroy_notify func)
93 {
94 if (!clearing_) // TODO: Is it okay to silently ignore attempts to add dependencies when the list is being cleared?
95 // I'd consider this a serious application bug, since the app is likely to segfault.
96 // But then, how should we handle it? Throw an exception? Martin.
97 callbacks_.push_back(trackable_callback(data, func));
98 }
99
clear()100 void trackable_callback_list::clear()
101 {
102 clearing_ = true;
103
104 for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
105 (*i).func_((*i).data_);
106
107 callbacks_.clear();
108
109 clearing_ = false;
110 }
111
remove_callback(void * data)112 void trackable_callback_list::remove_callback(void* data)
113 {
114 if (clearing_) return; // No circular notices
115
116 for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
117 if ((*i).data_ == data)
118 {
119 callbacks_.erase(i);
120 return;
121 }
122 }
123
124 } /* namespace internal */
125
126
127 } /* namespace sigc */
128