someTypeToStoreFunction func;

constructor()
{
     if(argcount == 1)
           func = func_which_takes_1_arg;
	else if(argount == 2)
  		func = func_which_takes_2_arg;
    else
      func = func_which_takes_3_arg;
}

executeit2()
{
     func(a,b);
}