On Fri, 2010-02-26 at 15:08 +0100, Jiří Zárevúcky wrote:
> Sam Wilson píše v Čt 25. 02. 2010 v 21:58 -0500:
> >
> > Would this also be a valid way to check for null?
> >
> >
> > T unbox<T>(T? v, string str)
> > {
> > if (v == null)
> > throw new MyError.FAILED(str);
> >
> > return (T)v;
> > }
>
> I suppose it should work quite the same, but I'm not sure how does Vala
> cope with nullable -> non-nullable casts.
>
When I try and compile the following code, I get this error:
"unnull.vala:17.9-17.62: error: Assignment: Cannot convert from `T' to
`GLib.Object'"
Is this a bug, or are templates meant to work like this?
[code]
errordomain MyError
{
FAILED;
}
T unbox<T>(T? v, string message)
{
if (v == null)
throw new MyError.FAILED(message);
return (T)v;
}
int main(string[] args)
{
Object? nullable = new Object();
Object not_nullable = unbox(nullable, "The object was null!");
return 0;
}
[/code]
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