Re: [gnome-db] libgda: Take class hierarchy into account in gda_dict_declare_object?

["Vivien Malerba" <vmalerba gmail com>]

On 1/12/07, Armin Burgmeier <armin arbur net> wrote:
> When wrapping GdaQuery for libgdamm I noticed that every time one wants
> to use a GdaQuery in C++ libgda prints an ugly warning to the screen
> (and probably does not behave correctly) that is caused by the GdaDict
> object declaration system (namely gda_dict_declare_object_as() ).
> libgdamm subclasses GdaQuery to allow implementing default signal
> handlers and stuff in C++ but this causes said function not to recognize
> it as a GdaQuery anymore.
>
> I am not sure about the semantics of that dict object declaration stuff,
> this is why I am asking: Would it be possible to take parent types into
> account if no GdaRegisterDictStruct for the given GType was found? I
> could come up with a patch if you think that this is OK.

You can try to change gda_dict_declare_object() in gda-query.c with
gda_dict_declare_object_as() specifying GDA_TYPE_QUERY as the last
argument. This causes GdaDict to take the specified data type instead
of the one determined by the object itself (which is obviously not
GDA_TYPE_QUERY if you subclass it). This is done for the GdaGraphQuery
object which registers itself as a GDA_TYPE_GRAPH.

Tell me if it works.

Cheers,

Vivien