blob: 5110f483324b950485c4e8517edaa817fc8ba504 (
plain)
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
|
#ifndef __pbd_shiva_h__
#define __pbd_shiva_h__
#include <sigc++/sigc++.h>
namespace PBD {
template<typename ObjectWithGoingAway, typename ObjectToBeDestroyed>
/* named after the Hindu god Shiva, The Destroyer */
class Shiva {
public:
Shiva (ObjectWithGoingAway& emitter, ObjectToBeDestroyed& receiver) {
/* if the emitter goes away, destroy the receiver */
_connection1 = emitter.GoingAway.connect
(sigc::bind (sigc::mem_fun
(*this, &Shiva<ObjectWithGoingAway,ObjectToBeDestroyed>::destroy),
&receiver));
/* if the receiver goes away, forget all this nonsense */
_connection2 = receiver.GoingAway.connect
(sigc::mem_fun (*this, &Shiva<ObjectWithGoingAway,ObjectToBeDestroyed>::forget));
}
~Shiva() {
forget ();
}
private:
sigc::connection _connection1;
sigc::connection _connection2;
void destroy (ObjectToBeDestroyed* obj) {
delete obj;
forget ();
}
void forget () {
_connection1.disconnect ();
_connection2.disconnect ();
}
};
}
#endif /* __pbd_shiva_h__ */
|
