类成员函数指针的问题，编译不通过，大家帮忙看下。(已解决)

mikkoyue

源文件如下：

1. 
   
2.   1 #ifndef _USERLOGIN_PROTOCOL_H
   
3.   2 #       define _USERLOGIN_PROTOCOL_H
   
4.   3
   
5.   4 #include "protocols.h"
   
6.   5
   
7.   6 //typedef int (*pro_Action)(int);
   
8.   7
   
9.   8 class protocolController
   
10.   9 {
    
11. 10 public:
    
12. 11         protocolController();
    
13. 12 private:
    
14. 13         //pro_Action action[30];
    
15. 14         int (protocolController::*action[30])(int) const;
    
16. 15
    
17. 16         int action_NULL(int signal) const;
    
18. 17         int action_ServerStatus(int signal) const;
    
19. 18         int action_LoginUsername(int signal) const;
    
20. 19         int action_LoginPassword(int signal) const;
    
21. 20         int action_RegisterUsername(int signal) const;
    
22. 21         int action_RegisterPassword(int signal) const;
    
23. 22         int action_RegisterEmail(int signal) const;
    
24. 23 };
    
25. 24
    
26. 25 typedef int (protocolController::*pro_Action)(int);
    
27. 26 #endif
    

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1. 
   
2.   1 #include "protocolController.h"
   
3.   2 #include "protocols.h"
   
4.   3 #include <string.h>
   
5.   4
   
6.   5 protocolController::protocolController()
   
7.   6 {
   
8.   7         for (int i = 0; i < 30; i++)
   
9.   8         {
   
10.   9                 action[i] = &(protocolController::action_NULL);
    
11. 10         }
    
12. 11         action[C_BEDEFINE_0]        = &action_NULL;
    
13. 12         action[C_SERVER_STATUS]     = &action_ServerStatus;
    
14. 13         action[C_LOGIN_USERNAME]    = &action_LoginUsername;
    
15. 14         action[C_LOGIN_PASSWORD]    = &action_LoginPassword;
    
16. 15         action[C_REGISTER_USERNAME] = &action_RegisterUsername;
    
17. 16         action[C_REGISTER_PASSWORD] = &action_RegisterPassword;
    
18. 17         action[C_REGISTER_EMAIL]    = &action_RegisterEmail;
    
19. 18 }
    

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编译结果如下：

1. 
   
2. $ g++ -c protocolController.cpp -o protocolController.o
   
3. protocolController.cpp: In constructor 'protocolController::protocolController()':
   
4. protocolController.cpp:9: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_NULL'
   
5. protocolController.cpp:11: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_NULL'
   
6. protocolController.cpp:12: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_ServerStatus'
   
7. protocolController.cpp:13: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_LoginUsername'
   
8. protocolController.cpp:14: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_LoginPassword'
   
9. protocolController.cpp:15: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_RegisterUsername'
   
10. protocolController.cpp:16: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_RegisterPassword'
    
11. protocolController.cpp:17: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member function to form a pointer to member function.  Say '&protocolController::action_RegisterEmail'
    
12. $
    

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x11

不行就改成static，参数加上this

mikkoyue

我试过了，一样不通过。

zlbruce

Say '&protocolController::action_NULL'
这样??

mikkoyue

问题已经解决，楼上的正解。我竟然加了没用的括号。
有时候“画蛇添足”还真是不经意的。