C++ - 2 classes 1 file

Question

Suppose I want something of this sort, in one .cpp source file:

class A {
    public:
        void doSomething(B *b) {};
};

class B {
    publi         


        

Answer 1

You can try a forward declaration like

class B;
class A {
  void Method( B* );
};
class B{
};

but you will only be able to declare pointer and reference variables for B then. If you want more (like a method that dereferences B* variable) you can provide a declaration only and define methods later in the same file - at the point where both classes declaration is already available.