Question

If I have a function pointer

MyFunctionPointer myFunctionPointer;

I can pass it parameters like:

myFunctionPointer(1,2);

I am looking to do something similar, but call a particular function on an object. I currently have something like this:

if(case1)
  myObject.Case1();
else if(case2)
  myObject.Case2();

Instead, is there any way to do something like:

  myObject.myFunctionPointer();

?

Thanks,

David

Answer 1

If you declare a function pointer as a member function of a class then yes you can assign your function to that member function and then later call the function.

so if you declare a function pointer in your class

int (*foo)(int) = NULL; // takes int arg, returns int

once you assign the method to a function you can call it as you desire:

myObject.foo(42);

e.g.

class myfoo
{
public:
    int (*foo)(int);
};

int myfoofunc(int n)
{
    return n/2;
}

...

myfoo f;
f.foo = myfoofunc;
cout << f.foo(2) << endl; // would output 1