Re: [Vala] Invalid C code in Interfaces

[Abderrahim Kitouni <a kitouni gmail com>]

Hi,
                      في ح، 03-10-2010 عند 19:30 -0400 ، كتب tecywiz121:
> Hello again!
>
> I seem to have run into a case where valac generates incorrect C code.
> I'm sure what I am doing is wrong, but I assume that valac should emit
> the error and not gcc.
Definitely, the rule of thumb is : if valac generates invalid C code
it's a bug, either in valac or (more likely) in the bindings.

> When I try to compile this snippet,
>
> public interface IFace<G> : Object
> {
>   public G[] foobar()
>   {
>     G[] storage = new G[2];
>     return storage[0:1];
>   }
> }
>
> void main(){}
>
> I get this error from gcc:
>
> In function ‘iface_foobar’:
> generic.vala.c:54: error: dereferencing pointer to incomplete type
>
> The relevant C code is:

The problem is in self->priv->g_dup_func, interfaces cannot have fields,
but the codegen is assuming otherwise. If you make your interface an
abstract class, it works.  Maybe this should be replaced with a property
access (using g_object_get) at least in interfaces.

HTH,
Abderrahim