C++ Class object as argument of function

Question

I have two functions in two different files

in file A.cpp

void func(int x, A a){...}

in file B.cpp

void func(int x, B b){...}

These two functions do pretty much the same thing, so I would like to merge them, ie, create a function in file C.cpp who will look like this

void func(int x, AorB c){...} . I don't want my function to look like void func(int x, A a, B b){...}

I'd like to create a class AorB such that my c object is either of type A or B depending on which object I pass to the function.

Answer 1

Templates could help here, if the processing is the same:

template <class X>
void func(int x, X b) {
    ...
}

But beware, templates have to be resolved at compile time, so they have to reside in header files and not in separate compilation units.