Question

I have something like the attached. I basically have a Doer class in which I want to call Func() from it’s member without using virtual or with the least code duplication possible. Also, boost is not an option either. I know the example may not be so clear but I hope you get the idea. B

class Base { // a bunch of shared base functionality. Cannot be instantiated by itself  }

class D1 : public Base
{
   void Func();
}

class D2 : public Base
{
   void Func();
}

//----

class Doer
{
   Doer(Base* b) : base(b) { } 

   void DoIt()
   {
      base->Func();
   }

   Base* base;
}

Answer 1

Well, you can make Doer templated:

template<class T>
class Doer
{
public:
   Doer(T* b) : base(b) { } 

   void DoIt()
   {
      base->Func();
   }

private:
   T* base;
};

But for this I would just add a virtual void Func() to Base instead.

Note that you’ll probably want to make Func public in either case 🙂