blob: de89bf9ccfc597b33a9b025aa13d895c528aac28 (
plain) (
blame)
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
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @author Peter Boros
* @date 2004/08/20
* @version $Id$
* @file refcountable.h
* @brief Reference countable template
*/
#pragma once
#include "mutex.h"
namespace fsa {
// {{{ class RefCountable
/**
* @class RefCountable
* @brief Reference countable template
*
* Subclass this template, and use the addReference and removeReference
* methods to keep track of how many references the object has. When
* the last reference is removed, the object blows up (well, destroys
* itself).
*/
template <typename T>
class RefCountable
{
protected:
/** Reference count */
int _refCount;
/** Lock */
Mutex _sequencerLock;
/**
* @brief Destroy the object
*
* @return True.
*/
virtual bool destroy(void)
{
delete this;
return true;
};
private:
/** Unimplemented private copy constructor. */
RefCountable(const RefCountable &original);
/** Unimplemented private assignment operator. */
const RefCountable& operator=(const RefCountable &original);
public:
/**
* @brief Constructor
*/
RefCountable(void)
: _refCount(0),
_sequencerLock()
{
}
/**
* @brief Destructor
*/
virtual ~RefCountable(void) {}
/**
* @brief Increase reference count.
*/
virtual void addReference(void)
{
_sequencerLock.lock();
_refCount++;
_sequencerLock.unlock();
}
/**
* @brief Decrease reference count, and destroy object if no
* references are left.
*
* @return True if the object was destroyed.
*/
virtual bool removeReference(void)
{
bool destroyed = false;
_sequencerLock.lock();
_refCount--;
if(_refCount<1){
_sequencerLock.unlock();
destroyed = destroy();
}
else{
_sequencerLock.unlock();
}
return destroyed;
}
};
// }}}
} // namespace fsa
|
