C++: Accessing Virtual Methods

Question

I'm trying to use the virtual method table to call functions by index in a class... Suppose we have the following code:

class Base
{
public:
    Base() {}
    virtual ~Base() {}

    virtual Base* call_func(unsigned int func_number)
    {
       // Some way to call f_n
    }
protected:
    virtual Base* f_1() const = 0;
    virtual Base* f_2() const = 0;
    virtual Base* f_3() const = 0;
};

I've already implemented this using function arrays, if-statement and case-statement... so, Is there a a better approach to call methods using just pointers (accessing to the vtable for example) or something like that?

Sorry for my horrible English :S... and thanks in advance!

EDIT: Thanks for all the suggestion! I'm going to expand my question:

After resolve this i'm going to create derived classes (for example derived1 and derived 2) with different implementations of f_1, f_2, f_3 and have a class control like this:

class Control
{
protected:
    Base* current;

public:
    Control(Base* curr = new derived1): current(curr) {}
    virtual ~Control() 
    {
        delete current;
    }
    virtual void do_something(unsigned int func_numb)
    {
        delete current
        Base* new = current->next_state(stl);
        current = new;
    }
};

Answer 1

Either a switch statement:

switch (func_number)
{
    case 1:
        f_1();
        break;
    case 2:
        f_2();
        break;
    case 3:
        f_3();
        break;
}

Or use an array of function pointers.