funptr2.cpp
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#include <iostream>
using namespace std;
class X {
protected:
int val;
public:
X(int v) : val(v){};
virtual void f(double a)
{
cout << a + val << endl;
}
virtual ~X(){};
};
class Y : public X {
public:
Y(int v) : X(v){};
void f(double a)
{
cout << 2 * a + val << endl;
}
};
typedef void (X::*pf)(double); // pointer to member
void test(X* p, X* q)
{
pf m = &X::f;
(p->*m)(6.0);
(q->*m)(7.0);
}
int main()
{
X i(3);
Y j(4);
test(&i, &j);
}