靜態成員函式可以通過引用類物件訪問類成員變數；

test.h

#ifndef TEST_H
#define TEST_H


class Test
{
public:
    Test();
    Test( int a, int b );

    static void print( Test &test );

private:
    int m;
    int n;
    int sum;
};

#endif // TEST_H

#include "test.h"

#include <iostream>

using namespace std;

Test::Test()
{

}

Test::Test(int a, int b)
{
    m = a;
    n = b;
    sum = m + n;
}

void Test::print(Test &test)
{
    cout << "m:" << test.m << endl
         << "n:" << test.n << endl
         << "sum:" << test.sum << endl;
}
 

#include "test.h"

#include <iostream>

using namespace std;

//宣告函式指標,宣告時注意函式返回值型別及引數型別要保持一致
int (*p)( int, int );
void (*funcp)();

//函式宣告
int add_ret(int a, int b);
int add(int a, int b, int (*p)(int, int));
void FileFunc();
void EditFunc();

int main(int argc, char *argv[])
{
    int a, b;
    cout << "please enter two number(eg:a b):";
    cin >> a >> b;

    Test test( a, b );
    Test::print( test );            //靜態成員函式的呼叫

    p = add_ret;                    //把函式 add_ret 的地址賦給函式指標 p
    int sum = p( a, b );            //呼叫函式指標
    cout << "int (*p)( int, int ):" << sum << endl;
    sum += add( a, b, p );          //呼叫回撥函式
    cout << "int add(int a, int b, int (*p)(int, int)):" << sum << endl;

    cout << "int (*p)( int, int ):" << endl;
    funcp = FileFunc;               //把函式 FileFunc 的地址賦給函式指標 funcp
    funcp();                        //呼叫函式指標
    funcp = EditFunc;               //把函式 EditFunc 的地址賦給函式指標 funcp
    (*funcp)();                     //呼叫函式指標

    cout << "void(*pfunarr[2])():" << endl;
    void(*pfunarr[2])();            //函式指標陣列
    pfunarr[0] = FileFunc;
    pfunarr[1] = EditFunc;

    pfunarr[0]();                   //函式指標陣列呼叫
    pfunarr[1]();

    cout << "void(*(*ppfunarr)[2])():" << endl;
    void(*(*ppfunarr)[2])();
    ppfunarr = &pfunarr;             //函式指標陣列指標賦值
    (*ppfunarr)[0]();
    (*ppfunarr)[1]();

    return 0;
}

int add_ret( int a, int b )
{
    return a + b;
}

//回撥函式
int add( int a, int b, int (*p)(int , int ))
{
    return (*p)( a, b );
}

void FileFunc()
{
    cout << "FileFunc!" << endl;
}

void EditFunc()
{
    cout << "EditFunc!" << endl;
}
 

輸出如圖所示：

參考文件：