funptr1.cpp
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#include <iostream>
using namespace std;
class X {
double g(double a)
{
return a * a + 5.0;
}
double h(double a)
{
return a - 13;
}
public:
void test(X*, X);
};
typedef double (X::*pf)(double); // pointer to member
void X::test(X* p, X q)
{
double g5 = p->g(5.0); // call directly
double h5 = p->h(5.0); // call directly
double g10 = q.g(10); // call directly
double h10 = q.h(10); // call directly
cout << "g5 = " << g5 << "\n ";
cout << "h5 = " << h5 << "\n ";
cout << "g10 = " << g10 << "\n ";
cout << "h10 = " << h10 << "\n ";
pf m1 = &X::g;
pf m2 = &X::h;
double g6 = (p->*m1)(6.0); // call through pointer to member
double h6 = (p->*m2)(6.0); // call through pointer to member
double g12 = (q.*m1)(12); // call through pointer to member
double h12 = (q.*m2)(12); // call through pointer to member
cout << "g6 = " << g6 << "\n ";
cout << "h6 = " << h6 << "\n ";
cout << "g12 = " << g12 << "\n ";
cout << "h12 = " << h12 << "\n";
}
int main()
{
X i;
i.test(&i, i);
}