🚀 go-pugleaf

"Karl Heinz Buchegger" <kbuchegg@gascad.at> skrev i meddelandet
news:3CE4C209.7010606@gascad.at...
>
>
> Christopher Deli wrote:
>
> > The thing is that the assignment I am working with demands that I have a
> > base class A with two subclasses (B and C) and I need to make ONE list
with
> > both B and C objects. A should be an abstract class. So I need to create
an
> > A pointer which sometimes points on B objects and sometimes on C
objects.
> > And on top of that I need an operator which can add two B objects. If I
only
> > put the operator in class B it wont work if the pointers I try to add
have
> > static type A and dynamic type B.
> >
>
>
> First of all: please don't top post.
> Scroll to the section you want to reply to, and insert
> your comments there.
>
> As you have seen, there is a technical problem with having
> an operator: the return type.
> Are you sure you *must* implement an operator or will an
> ordinary member function be sufficient?
> If your assignment explicitely states an operator, then I
> would suggest to ask your teacher, how he thinks this should
> work (Hint: it is impossible, since operator+ has to return
> an object, but for polymorphism you would need a pointer or
> a reference).
>
> --
> Karl Heinz Buchegger
> kbuchegg@gascad.at
>

Can I create a member function which serves the same function as an operator
(is it possible to write a = c + b?)? I tried to make a friend operator
aswell but the same things happened.. Isn't it possible to change the static
type of my pointer by type casting or something so it could be enough with
and operator in the subclass?

//Christopher