C++ 类成员函数作为参数

#include <iostream>
using namespace std;

typedef int int32_t;

struct IMsgBody{
    int body;
};

struct Arg{
    int arg;
};

class A;

typedef int32_t (A::*GetArg_Fun)(IMsgBody *pMsgBody, Arg *stArg);    //函数指针

class A
{
public:
    A(){}
    ~A(){}
    int32_t GetArg_GameEnd(IMsgBody *pMsgBody,Arg *stArg);
    int32_t GetTaskArg(IMsgBody *pMsgBody,Arg *stArg,GetArg_Fun getArg_Fun);
    int32_t GetTaskArg(IMsgBody *pMsgBody,Arg *stArg);
};

int32_t main()
{
    IMsgBody msgBody;
    Arg arg;
    msgBody.body = 78;
    arg.arg = 45;
    A a;
    a.GetTaskArg(&msgBody,&arg);
    return 0;
}

int32_t A::GetArg_GameEnd(IMsgBody *pMsgBody,Arg *stArg)
{
    cout<<"pMsgBody:"<<pMsgBody->body<<endl;
    cout<<"Arg:"<<stArg->arg<<endl;
    return 123;
}

int32_t A::GetTaskArg(IMsgBody *pMsgBody,Arg *stArg,GetArg_Fun getArg_Fun)
{
    int ret = 0;
    ret = (this->*getArg_Fun)(pMsgBody,stArg);
    cout<<"ret = "<<ret<<endl;
    return 0;
}

int32_t A::GetTaskArg(IMsgBody *pMsgBody,Arg *stArg)
{
    GetTaskArg(pMsgBody,stArg,&A::GetArg_GameEnd);
    return 0;
}