复习 C++ 中类的函数指针

 1 #include <iostream>
 2 #include <map>
 3 
 4 enum MsgCode
 5 {
 6     MSGCODE1 = 1,
 7     MSGCODE2 = 2,
 8 };
 9 
10 class Fuck
11 {
12 public:
13     Fuck(int i=0):f(i){
14         // register functions
15         mapFunction[MSGCODE1] = &Fuck::method1;
16         mapFunction[MSGCODE2] = &Fuck::method2;
17         // ...
18     }
19 
20 public:
21     int method1(int i);
22     int method2(int i);
23     // ...
24 
25 public:
26     bool processMsg(int msg_code, int msg_data);
27 
28 private:
29     int f;
30 
31 private:
32     std::map<int, int (Fuck::*)(int i)> mapFunction;
33     // int (Fuck::*mapFunction[1024])(int i);
34     // std::map<std::string, int (Fuck::*)(int i)> mapFunction;
35 };
36 
37 int Fuck::method1(int i)
38 {
39     return i * f;
40 }
41 
42 int Fuck::method2(int i)
43 {
44     return i * f + 1;
45 }
46 
47 bool Fuck::processMsg(int msg_code, int msg_data)
48 {
49     std::map<int, int (Fuck::*)(int i)>::iterator it = mapFunction.find(msg_code);
50     if(it == mapFunction.end())
51         return 0;
52 
53     int result = (this->*it->second)(msg_data);
54     std::cout << result << std::endl;
55 
56     return 1;
57 }
58 
59 int main(int argc, char** argv)
60 {
61     Fuck fuck(1);
62 
63     int msg_code = MSGCODE1;
64     int msg_data = 1;
65     fuck.processMsg(msg_code, msg_data);
66 
67     msg_code = MSGCODE2;
68     msg_data = 1;
69     fuck.processMsg(msg_code, msg_data);
70 
71     return 0;
72 }