C++: Function pointer to functions with variable number of arguments

Question

I\'m trying to figure out a way of how to be able to assign a function pointer to functions with different number of arguments.

I have a while loop which takes a nu

Answer 1

You could use std::function<> and std::bind().

#include 

using std::placeholders::_1;

typedef std::function my_fun_t;
my_fun_t my_fun;

if (condition1)
    my_fun = std::bind(&MyClass::function_one, _1);
else if (condition2)
    my_fun = std::bind(&MyClass::function_two, _1, a, b);
else if (condition3)
    my_fun = std::bind(&MyClass::function_three, _1, a, b, c);
else if (condition4)
    my_fun = std::bind(&MyClass::function_four, _1, a, b, c, d);

while (my_fun(my_class)) { ... }

These assumes you will use C++11. If you can't use C++11 but can use TR1, replace all std:: with std::tr1::. There is also a Boost implementation.