// pointers08.cpp
#include <utility> // pair
#include <vector>

typedef unsigned int pixelValue;
typedef std::pair<int, int> pixelIndex;

class Shape
{
public:
	Shape(int id) :m_id(id) {}

	virtual void Draw(std::vector<std::vector<pixelValue> >& bitmap) const = 0;
protected:
	void DrawLine(pixelIndex a, pixelIndex b, std::vector<std::vector<pixelValue> >& bitmap) const
	{
		// draw a line from a to b in bitmap
	}
private:
	int m_id;
};

class Triangle : public Shape
{
public:
	Triangle(int id, pixelIndex a, pixelIndex b, pixelIndex c)
		: Shape(id), m_a(a), m_b(b), m_c(c)
	{}

	void Draw(std::vector<std::vector<pixelValue> >& bitmap) const
	{
		DrawLine(m_a, m_b, bitmap);
		DrawLine(m_b, m_c, bitmap);
		DrawLine(m_c, m_a, bitmap);
	}
private:
	pixelIndex m_a;
	pixelIndex m_b;
	pixelIndex m_c;
};

int main()
{
	Triangle t(0, pixelIndex(0, 0), pixelIndex(0, 1), pixelIndex(1, 0));
	Triangle* p1 = &t;
	Shape* p2 = &t;

	return 0;
}