1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
// -*- c++ -*-
/*
* Copyright 2002, The libsigc++ Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sigc++/trackable.h>
#include <iostream>
using namespace std;
namespace sigc
{
trackable::trackable()
: callback_list_(0)
{}
/* Don't copy the notification list.
The objects watching src don't need to be notified when the new object dies. */
trackable::trackable(const trackable& /*src*/)
: callback_list_(0)
{}
trackable& trackable::operator=(const trackable& src)
{
if(this != &src)
notify_callbacks(); //Make sure that we have finished with existing stuff before replacing it.
return *this;
}
trackable::~trackable()
{
notify_callbacks();
}
void trackable::add_destroy_notify_callback(void* data, func_destroy_notify func) const
{
callback_list()->add_callback(data, func);
}
void trackable::remove_destroy_notify_callback(void* data) const
{
callback_list()->remove_callback(data);
}
void trackable::notify_callbacks()
{
if (callback_list_)
delete callback_list_; //This invokes all of the callbacks.
callback_list_ = 0;
}
internal::trackable_callback_list* trackable::callback_list() const
{
if (!callback_list_)
callback_list_ = new internal::trackable_callback_list;
return callback_list_;
}
namespace internal
{
trackable_callback_list::~trackable_callback_list()
{
clearing_ = true;
for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
(*i).func_((*i).data_);
}
void trackable_callback_list::add_callback(void* data, func_destroy_notify func)
{
if (!clearing_) // TODO: Is it okay to silently ignore attempts to add dependencies when the list is being cleared?
// I'd consider this a serious application bug, since the app is likely to segfault.
// But then, how should we handle it? Throw an exception? Martin.
callbacks_.push_back(trackable_callback(data, func));
}
void trackable_callback_list::clear()
{
clearing_ = true;
for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
(*i).func_((*i).data_);
callbacks_.clear();
clearing_ = false;
}
void trackable_callback_list::remove_callback(void* data)
{
if (clearing_) return; // No circular notices
for (callback_list::iterator i = callbacks_.begin(); i != callbacks_.end(); ++i)
if ((*i).data_ == data)
{
callbacks_.erase(i);
return;
}
}
} /* namespace internal */
} /* namespace sigc */
|
