Structural Patterns - Adapter

Adapter

//Structural Patterns - Adapter
#include <iostream>
using namespace std;

typedef int Coordinate;
typedef int Dimension;

// Desired interface
class Rectangle
{
public:
    virtual void draw() = 0;
};

// Legacy component
class LegacyRectangle
{
public:
    LegacyRectangle(Coordinate x1, Coordinate y1, Coordinate x2, Coordinate y2)
    {
        x1_ = x1;
        y1_ = y1;
        x2_ = x2;
        y2_ = y2;
        cout << "LegacyRectangle:  create.  (" << x1_ << "," << y1_ << ") => ("
            << x2_ << "," << y2_ << ")" << endl;
    }
    void oldDraw()
    {
        cout << "LegacyRectangle:  oldDraw.  (" << x1_ << "," << y1_ << 
            ") => (" << x2_ << "," << y2_ << ")" << endl;
    }
private:
    Coordinate x1_;
    Coordinate y1_;
    Coordinate x2_;
    Coordinate y2_;
};

// Adapter wrapper
class RectangleAdapter: public Rectangle, private LegacyRectangle
{
public:
    RectangleAdapter(Coordinate x, Coordinate y, Dimension w, Dimension h):
      LegacyRectangle(x, y, x + w, y + h)
      {
          cout << "RectangleAdapter: create.  (" << x << "," << y <<"), width = " << w << ", height = " << h << endl;
      }
      virtual void draw()
      {
          cout << "RectangleAdapter: draw." << endl;
          oldDraw();
      }
};

int main()
{
    Rectangle *r = new RectangleAdapter(120, 200, 60, 40);
    r->draw();
}