Re: [Vala] Warning while casting custom classes

[Stephen Smally <eco stefi fastwebnet it>]

Il 23/07/2012 02:02, Nor Jaidi Tuah ha scritto:
> > When casting to PicassoLine or PicassoRectangle it pop up:
> > (Picasso:10091): GLib-GObject-WARNING **: invalid cast from
> > `PicassoPicassoItem' to `PicassoPicassoRectangle' (or PicassoPicassoLine)
>
> Try changing
>
> ((PicassoLine) canvas.preview).....
>
> to
>
> (canvas.preview as PicassoLine)....
>
> If that still gives you warnings, try declaring
> PicassoItem class as *abstract* so that you don't
> accidentally do something like this:
>
>    var type = ItemType.NONE;
>    PicassoItem item = new PicassoItem(0, 0, type); // big mistake!
>    item.type = ItemType.CIRCLE;   // big mistake!
>
> By the way, I'm sure you don't need ItemType.
> Vala supports runtime class check.
>
> hand
>
>
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Thanks but i already solved this problem, i was casting PicassoItem to 
PicassoLine without having PicassoLine initialized...