Re: CListBoxGetItemDataPtr and dynamic cast

"Joseph M. Newcomer" <newcomer@flounder.com> ha scritto nel messaggio
news:9k64l3dgmr5dtfl3cc65t3s67lh2rjp48d@4ax.com...


Hi Joe,

I may be missing something, but I think that using 'virtual' in this context
would not be of important help.

The problem here is the type of the return value. If you have a method
declared as virtual, this does not help much.

The help that virtual gives is when you want to use polymorphism and
pointers, e.g.

 class Base
 {
    ...
    public:
       virtual void * GetSomething();
 };

 class Derived : public Base
 {
   ...
   public:
      virtual void * GetSomething();
 };

And so if you have:

  Base * p = new Derived();
  p->GetSomething();

then Derived::GetSomething() is called (and not Base::GetSomething).

I think that using templates would have helped better (because the return
type can be made a template type), but I see several problems when I try to
mix templates and MFC... for example, for message maps.

What do you think about this (templates and MFC) ?

Thanks,
Giovanni