Re: [Vala] Bad C code generation (lvalue required as unary '&' operand)

[yannick inizan <inizan yannick gmail com>]

the old safe method :

2015-01-29 16:48 GMT+01:00 Guillaume Poirier-Morency <
guillaumepoiriermorency gmail com>:

> Le jeudi 29 janvier 2015 à 15:30 +0100, yannick inizan a écrit :
> > Vala translate your cast to a get_<type> function of your value.
> >
> > ex:
> > Value v = "toto";
> > var val = (string)v; //equals to 'var val = v.get_string();'
> >
> > so (Value)my_val is impossible because GLib.Value doesn't have a
> > get_value function.
> >
> > 2015-01-29 15:16 GMT+01:00 Guillaume Poirier-Morency
> > <guillaumepoiriermorency gmail com>:
> >         I am working on Valum, a web micro-framework written in Vala
> >         https://github.com/antono/valum
> >
> >         valac is generating very strange code that doesn't compile.
> >
> >         Part of the framework is about offering facilities to push
> >         arbitrary
> >         values into CTPL template environment.
> >
> >         At some point, I try to case a Value? to a non-null Value (I
> >         have of
> >         course tested the null case, I just want it to pass under
> >         --enable-experimental-non-null)
> >
> >                 vala --version
> >
> >                 Vala 0.26.1
> >
> >         Here's the use case:
> >
> >                 Value? v;
> >                 var val = (Value) v;
> >
> >         The error:
> >
> >
> >                 lvalue required as unary '&' operand
> >
> >         I attached the full log and the bug is easily reproducible
> >         (the sample
> >         does it).
> >
> >         --
> >         Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>
> >
> >         _______________________________________________
> >         vala-list mailing list
> >         vala-list gnome org
> >         https://mail.gnome.org/mailman/listinfo/vala-list
>
> Thanks for the answer!
>
> That kind of code should be detected by Vala compiler as an error.
>
> What approach would you recommend to cast "Value?" to "Value" ?
>
> It's not that bad if it is not yet possible, but I would really like to
> build the whole projet with --enable-experimental-non-null ;)
>
>
> --
> Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>