Forum: C++: Hjälp med en övning, någon?

 
// samma betydelse
TheShapeList[i]->move(dx,dy);
(*this).TheShapeList[i]->move(dx,dy);
this->.TheShapeList[i]->move(dx,dy);
 

 
Group::~Group() {
 
    for(int i=0;i<TheShapeList.size();i++)
        delete [] TheShapeList[i];
 
delete [] TheShapeList;
}
 

 
Group::~Group() {
 
    for(int i=0;i<TheShapeList.size();i++)
        delete TheShapeList[i];
}
 

 
class Shape {
public:
    Shape(QWidget *aWidget,const char *n,QColor c,Point p);
    void getName(char *str) const;
    virtual ~Shape();
    QColor getColor() const;
    void setColor(QColor c);
    Point getPos() const;
    void moveTo(Point p);
    virtual void move(int dx,int dy);
    // pure virtual functions
    virtual void draw() const = 0;      // only implemented
    virtual void erase() const = 0;     // in subclasses
    virtual Shape* clone() const = 0;
protected:
    char myName[100];
    QColor myColor;
    Point myPos;
    QWidget *theWidget;
};
 
 

 
Shape *Shape::Clone () const
{
	Shape *shape = new Shape(m_number);
 
	return shape;
}
 

 
Group::Group( const Group & x) : Shape(x) {
 
     Group &x2 = const_cast<Group&>(x);
 
     vector<Shape *>::iterator it = x2.beginIterator();
     TheShapeList.clear();
     for (; it != x2.endIterator(); ++it)
        TheShapeList.push_back ((*it)->clone()); // innan utan clone()
 

 
Rectangle* Rectangle::clone()const {
Rectangle *rp = new Rectangle(theWidget,myName,myColor,myPos,myWidth,myHeight);
return rp;
 

 
Group* Group::clone()const {
    Group *gp = new Group(*this);
return gp;
}
 

 
Group::~Group() {
    for(int i=0;i<TheShapeList.size();i++)
        delete TheShapeList[i];
}
 

 
class Base{
public:
virtual void f(){ cout << "base";}
....
}
 
class Sub : public Base{
public:
void f(){ cout << "sub";} // slipper skriva virtual om jag vill ha dynamiskt binding pga den ärvs från Base ända ner till SubSub
....
}
 
 
class SubSub : public Sub{
public:
void f(){ cout << "subsub";}
....
}