Passing function pointer in a variable

We are continuing with the previous example, and now we want to pass a pointer to a function in our process_integers() method. Shall we add an overload for just function pointers, or is there a more elegant way?

Getting ready

This recipe is continuing the previous one. You must read the previous recipe first.

How to do it...

Nothing needs to be done as boost::function<> is also constructible from the function pointers:

void my_ints_function(int i); 

int main() { 
    process_integers(&my_ints_function); 
}

How it works...

A pointer to my_ints_function will be stored inside the boost::function class, and calls to boost::function will be forwarded to the stored pointer.

There's more...

The Boost.Function library provides a good performance for pointers to functions, and it will not allocate memory on heap. Standard library std::function is also effective in storing function pointers. Since Boost 1.58, the Boost.Function library can store functions and...