类成员函数指针指向类成员

point_to_menber_func.cpp

#include <iostream>

using namespace std;

class A {
public:
    A() {
        q=&A::funcA;
        cout << "q=" << q << endl;
        //(this ->* ((A*)this)->A::q) ();
        (this ->* q) ();

        q=&A::funcB;
        cout << "q=" << q << endl;
        (this ->* q) ();
    }
    void funcA() {
        cout << "funcA" << endl;
    }

    void funcB() {
        cout << "funcB" << endl;
    }
    void (A::*q)();
    void (*pq) ();
};

void func() {
    cout << "func" << endl;
}

int main(int argc, char** argv) {
    A a;
    a.q = &A::funcA;
    (a.*(a.q)) ();
    a.q = &A::funcB;
    (a.*(a.q)) ();

    a.pq = func;
    a.pq();


    void (A::*p)() = &A::funcA;
    cout << "p=" << p << endl;
    (a.*p)();
    p = &A::funcB;
    cout << "p=" << p << endl;
    (a.*p)();
    return 0;
}