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class Shape
{
    virtual void Draw() = 0; // pure virtual function
};

class Circle : public Shape
{
	virtual void Draw()
	{
		// draw shape as a circle
	}
};

class Rectangle : public Shape
{
	virtual void Draw()
	{
		// draw shape as a rectangle
	}
};

class Triangle : public Shape
{
	void Draw()
	{
		// draw shape as a triangle
	}
};

void drawShapes(std::list<Shape*> shapes)
{
	std::list<Shape*>::iterator pShape = shapes.begin();
	std::list<Shape*>::iterator pEnd = shapes.end();
	for ( ; pShape != pEnd; ++pShape)
	{
		pShape->Draw();
	}
}