Simple C++ Decorator Pattern example

DecoratorMain.cpp

// Simple decorator pattern example
// (c) Daniel Livingstone 2012
// CC-BY-SA

#include <string>
#include <iostream>
using namespace std;

class AbstractNPC {
public:
	virtual void render() = 0;
};

class NPC: public AbstractNPC {
private:
	string name;
public:
	NPC(string basename) { name.assign(basename); }
	NPC(char * basename) { name.assign(basename); }
	void render() { cout << name; }
};

class NPCDecorator: public AbstractNPC {
private:
	AbstractNPC * npc;
public:
	NPCDecorator(AbstractNPC *n) { npc = n; }
	void render() { npc->render(); } // delegate render to npc data member
};

class Elite: public NPCDecorator {
public:
	Elite(AbstractNPC *n): NPCDecorator(n) { }
	void render() {
		cout << "Elite "; // render special features
		NPCDecorator::render(); // delegate to base class
	}
};

class Captain: public NPCDecorator {
public:
	Captain(AbstractNPC *n): NPCDecorator(n) { }
	void render() {
		cout << "Captain "; // render special features
		NPCDecorator::render(); // delegate to base class
	}
};

class Shaman: public NPCDecorator {
public:
	Shaman(AbstractNPC *n): NPCDecorator(n) { }
	void render() {
		NPCDecorator::render(); // delegate to base class
		cout << " Shaman "; // render special features *after* base
	}
};

int main(int argc, char **argv)
{
	AbstractNPC *goblin1= new Elite(new Shaman(new NPC("Goblin")));
	AbstractNPC *orc1= new Elite(new Captain(new NPC("Orc")));
	goblin1->render(); cout << endl;
	orc1->render(); cout << endl;

	delete goblin1;
	delete orc1;
	cin.get();
	return 0;
}

I have not dealt fully with destructors in these examples

Very helpful, thx.