GreeterExplicit.cpp

#include <iostream>

using namespace std;

struct GenericGreeterVTable {
  void (*GreetFn) (void*, const char*)
};

class GenericGreeter {
public:
  GenericGreeterVTable* myGreeterVTable;

  GenericGreeter() {
    myGreeterVTable = ... some static piece of memory with the GenericGreeter VTable ...;
  }

  void Greet(const char* name) {
    GenericGreeterVTable->GreetFn(name);
  }
};

class FriendlyGreeter {
public:
  FriendlyGreeter() {
    myGreeterVTable = ... some static piece of memory with the FriendlyGreeter VTable ...;
  }
};