Inheritence to avoid duplicating business code.

cat.cpp

#include <ctime>
#include <cstdlib>

#include <iostream>
using namespace std;

class feline
{
	public:
		feline(void)
		{
			srand(time(0));
			cout << "Feline created!" << endl;
		}
		
		void entertain(void)
		{
			switch(rand() % 2)
			{
				case 0:
					meow();
					break;
				
				case 1:
					eat();
					break;
			}
		}
	
	protected:
		virtual void meow(void) = 0;
		virtual void eat(void) = 0;
};

class cat
	: public feline
{
	protected:
		virtual void meow(void)
		{
			cout << "Meow!" << endl;
		}
		
		virtual void eat(void)
		{
			cout << "Nom nom nom..." << endl;
		}
};

int main(void)
{
	cat annoyingThing;
	annoyingThing.entertain();
	
	return 0;
}