QtDesignPatterns/decoratorpattern/second_interface.h

#include "first_interface.h"

class ShapeDecorator
{
public:
    ShapeDecorator(Shape *shape)
    {
        this->shape = shape;
    }
    virtual ~ShapeDecorator(){}
    virtual void draw()
    {
        shape->draw();
    }

protected:
    Shape *shape;
};

class RedShapeDecorator: public ShapeDecorator
{
public:
    RedShapeDecorator(Shape *shape) : ShapeDecorator(shape){}
    void setRedBorder()
    {
        cout << "Border color: Red" << endl;
    }
    void draw()
    {
        shape->draw();
        setRedBorder();
    }
};