Re: member access
On May 16, 10:02 am, Valeriu Catina <cat...@hf-technik.uni-bremen.de>
wrote:
Hi,
consider the Shape class from the FAQ:
class Shape{
public:
Shape();
virtual ~Shape();
virtual void draw() = 0;
};
Now we have several derived shapes:
class Rectangle : public Shape{
public:
Rectangle();
void draw();
private:
double a; // width
double b; // height
};
class Circle{
public:
Circle();
void draw();
private:
double r; // radius
};
// more derived shapes follow
For each shape I would need to access its member variables. For this one
can add member functions in each derived class, for instance,
something like this in the Rectangle class:
double get_width() const
{
return a;
}
For a Shape derived class which would have many member variables, I
find it rather annoying and not very elegant to implement one get/set
member function for each member variable.
Is there any other way to gain access to the derived classes data,
(except making its member variables public)
Greetings,
Vali
For what purpose? Give an example. You could provide pointers or
references but the question is why?
Consider a virtual member function that calculates area(). Its the
member function that requires access to the members. Each type
calculates area in its own special way. I don't need to access the
circle's radius or the rectangle's width and height to calculate
area().
Let a virtual member function area() do it for me.
class Shape{
public:
Shape();
virtual ~Shape();
virtual void draw() = 0;
double area() const = 0;
};
Nothing stops you from providing an accessor to the members, i just
don't see why this shoud be a requirement.
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