类成员函数指针的问题，编译不通过，大家帮忙看下。

yxmab

代码如下：

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

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

编译结果如下：

1. $ g++ -c protocolController.cpp -o protocolController.o
   
2. protocolController.cpp: In constructor 'protocolController::protocolController()':
   
3. 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'
   
4. 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'
   
5. 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'
   
6. 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'
   
7. 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'
   
8. 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'
   
9. 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'
   
10. 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'
    
11. $

复制代码

[ 本帖最后由 yxmab 于 2007-11-15 09:05 编辑 ]

ypxing

>>action = &action_NULL;

你觉得action是个什么东东???

yxmab

是我初始化的一个函数指针，准备来调用各个函数用的，循环里的变量在粘贴时出错把下标丢了，不过，下面的都是对的。

ypxing

&protocolController::action_NULL

yxmab

我竟然对&protocolController::action_NULL加了括号，成了&(protocolController::action_NULL)，结果怎么也成功不了，现在成功了
在一成员函数里用“(this->*action[x])(strData);”语句调用成功。