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
|
#ifndef _support_refcount_h_
#define _support_refcount_h_
class refcountable {
public:
refcountable();
virtual ~refcountable();
void grab();
void release();
int get_refcount() const;
protected:
virtual void destructor();
private:
int _refcount;
};
class auto_grab {
public:
auto_grab(refcountable *_t) : t(_t) {
t->grab();
}
~auto_grab() {
if (t)
t->release();
}
private:
refcountable *t;
};
inline refcountable::refcountable() : _refcount(0) {}
inline refcountable::~refcountable() { /* assert(_refcount == 0); */ }
inline void refcountable::grab() {
_refcount ++;
}
inline void refcountable::release() {
_refcount --;
if (_refcount == 0)
destructor();
}
inline int refcountable::get_refcount() const {
return _refcount;
}
inline void refcountable::destructor() {
delete this;
}
#endif
|
