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 want std::function, a polymorphic function object, and std::bind to create function objects by binding arguments to the parameters of other functors.

If you can't use C++11, then boost::function and boost::bind are equivalent, although slightly more restrictive.

std::function my_fun;

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

while (my_fun()) 
{ ... }