Question

Would like to know the best way to handle this situation. How it would be possible to avoid duplicate element.

class ABO -> Need method A and B
method C

class AO : O
method A
class BO : O
method B

class O

Thanks!

Answer 1

You could avoid inheritance. If you only need a functionality and not an IS-A relationship, just use composition.

Hold 2 local members of the needed classes, and create a wrapper function that will call the member’s functions.

C-like pseudo code example:

class ABO
{
   AO m_ao;
   BO m_bo;

public:

   MethodA ()
   {
       m_ao.MethodA();
   }

   MethodB()
   {
      m_bo.MethodB();
   }
}