Passing functions as arguments

I remember reading a while back on how to pass a function into a function, but I forgot where. Does anyone know how to do this? Can you provide a simple example please? Or does anyone know where I can find info on this. I have been searching for a while and havent found anything.

Thanks

Eric

Code:

---

#include <iostream.h>

void one (void);
void two (void);

void doThis (void (*f) (void));

void main (void)
{
        void (*func) (void) = one;

        doThis (func);  // Pass an already declared pointer, or...
        doThis (two);  // Pass the address of function directly.
}


void one (void)
{
        cout << "One.\n";
}

void two (void)
{
        cout << "Two.\n";
}

void doThis (void (*f) (void))
{
        f ();
}

---

Remeber, the functions must be of the same return and arg types.