类成员函数作为回调函数

CommonFunctions.h
class CommonFunctions
{
public:
    CommonFunctions();
    static int add_test(int a, int b);
};

CommonFunctions.cpp
#include "CommonFunctions.h"
CommonFunctions::CommonFunctions()
{
}

int CommonFunctions::add_test(int a, int b)
{
    return a + b;
}

#include <iostream>
#include "CommonFunctions.h"
typedef int(*CallBackFunction)(int a, int b);
CallBackFunction CallBackFunction_PTR;

void set_call_back(CallBackFunction cbf)
{
    CallBackFunction_PTR = cbf;
}

int main()
{
    set_call_back(CommonFunctions::add_test);
    std::cout << CallBackFunction_PTR(5, 6);
    std::cout << "\r\n";
    system("pause");
}