[代码] c++观察者模式简易示例
01 |
#include <iostream> |
02 |
#include <string> |
03 |
#include <vector> |
04 |
#include <algorithm> |
05 |
using namespace std; |
06 |
07 |
class button; |
08 |
09 |
struct button_listener{ |
10 |
button_listener(){} |
11 |
virtual ~button_listener(){} |
12 |
virtual void button_clicked(button* btn)=0; |
13 |
}; |
14 |
15 |
class button{ |
16 |
private: |
17 |
vector<button_listener*> listeners; |
18 |
typedef vector<button_listener*>::iterator bit_type; |
19 |
string name; |
20 |
public: |
21 |
string get_name(){return name;}; |
22 |
button(string n):name(n){} |
23 |
~button(){} |
24 |
void add_button_listener(button_listener* bls){ |
25 |
listeners.push_back(bls); |
26 |
} |
27 |
void remove_button_listener(button_listener* bls){ |
28 |
listeners.erase(remove( |
29 |
listeners.begin(),listeners.end(),bls), |
30 |
listeners.end()); |
31 |
} |
32 |
void run(){ |
33 |
for(bit_type it=listeners.begin();it!=listeners.end();++it){ |
34 |
button_listener* bls = *it; |
35 |
bls->button_clicked(this); |
36 |
} |
37 |
} |
38 |
}; |
39 |
40 |
41 |
class my_button_listener:public button_listener{ |
42 |
private: |
43 |
int i; |
44 |
public: |
45 |
my_button_listener(int ii):i(ii){} |
46 |
void button_clicked(button* btn){ |
47 |
cout<<btn->get_name()<<" "<<i<<endl; |
48 |
} |
49 |
}; |
50 |
51 |
int main(){ |
52 |
button* btn = new button("nihao"); |
53 |
button_listener* bls1 = new my_button_listener(1); |
54 |
button_listener* bls2 = new my_button_listener(2); |
55 |
|
56 |
btn->add_button_listener(bls1); |
57 |
btn->add_button_listener(bls2); |
58 |
btn->run(); |
59 |
60 |
btn->remove_button_listener(bls1); |
61 |
btn->run(); |
62 |
63 |
delete btn; |
64 |
delete bls1; |
65 |
delete bls2; |
66 |
return 0; |
67 |
} |