On Wed, 2009-12-09 at 23:13 +0100, Jiří Zárevúcky wrote:
> Xavier Bestel píše v St 09. 12. 2009 v 22:42 +0100:
> > [...]
> >
> > Excuse me, but I'm a bit lost: I thought the question mark was for
> > nullable types. What's the link with "boxed" types ?
> >
> > Thanks,
> > Xav
> >
>
> In order to make a value type nullable, you need to convert it to a
> reference type. That's what you call boxing. So nullable and "boxed"
> types are essentially the same (in C# anyway I think). Though I believe
> Vala doesn't actually treat nullable types as reference types, because
> there is no way to track reference count (someone correct me if I'm
> mistaken). A nullable variable is implemented as a simple pointer here.
So that means you can't have boxed non-nullable types ?
And that means a "double" has a different behavior than a "double?" ?
Non-obvious.
Xav
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