C++成员指针

//这程序，刚看的时候好费劲啊，贴上来大家分享一下

#include

using namespace std;

class M

{

int x;

int y;

public:

void set(int a,int b)

{

x=a;

y=b;

}

friend int sum(M m);

};

int sum(M m)

{

int M::* px = &M::x; //M::*意为“指向类M的成员的指针”

int M::* py = &M::y;

M* pm = &m;

int s=m.*px + pm->*py;

return s;

}

int main()

{

M n;

void (M::*pf)(int ,int)=&M::set;

(n.*pf)(10,20);

cout << "sum" << sum(n) << endl;

M *op = &n;

(op->*pf)(30,40);

cout << "sum" << sum(n) << endl;

return 0;

}

//结果sum30

//sum70