Re: [Vala] Converting nullable to non-nullable types

[Jiří Zárevúcky <zarevucky jiri gmail com>]

Sam Wilson píše v Čt 25. 02. 2010 v 21:58 -0500:
> > Here's a little trick you might like:
> >
> > [code]
> >
> > errordomain MyError {
> >     FAILED;
> > }
> >
> > T throwerror<T> (string str) throws Error {
> >     throw new MyError.FAILED (str);
> > }
> >
> > int func ()
> > {
> >     int? i = null;
> >     int j = i ?? throwerror<int> ("hello");
> >     return j;
> > }
> >
> > [/code]
>
> 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.

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