Hi Kjell,
On 2015.04.08. 18:08, Kjell Ahlstedt wrote:
> A reply, at long last! I have filed bug
> https://bugzilla.gnome.org/show_bug.cgi?id=747508 with a patch that I think
> fixes your problem.
>
> It would be fine if you could test the patch with your quite complicated type
> of Variant. Can you apply and test a patch without great trouble?
Thanks for the patch, I'll try it later and will let you know about the results.
> If not, I can send you updated versions of the glibmm/variant.h and
> variant.cc files.
No need, thanks, patch is enough for me.
>
> Kjell
>
> Den 2015-03-31 13:43, Andrejs Hanins skrev:
>> Hi,
>>
>> Currently in Glibmm GDBus it seems no straightforward way to
>> dynamically cast VariantBase containing some signature with object paths (o)
>> into strictly typed Variant container. I faced the problem when interpreting
>> (casting) the result of standard DBus
>> org.freedesktop.DBus.ObjectManager.GetManagedObjects() method call which
>> return signature is a{oa{sa{sv}}} (note 'o'). Typed Variant in my code is
>> defined like this:
>>
>> Glib::Variant<std::map<Glib::ustring, std::map<Glib::ustring,
>> std::map<Glib::ustring, Glib::VariantBase>>>>
>>
>> but the Glib::VariantBase::cast_dynamic fails with bad_cast, because the
>> type signature of the typed Variant is a{sa{sa{sv}}}, thats is, object 'o'
>> is replaced with just 's'.
>>
>> My question - is there some ready-to-use type which can be used as a
>> parameter of Variant<> template to specify that the Variant holds an object
>> path, not just ordinary string?
>>
>> Of course, it is possible to create such a class in the client code
>> like this (pseudo code):
>>
>> class obj_path_t : public Glib::ustring;
>>
>> template<>
>> class Variant<obj_path_t> : public Variant<Glib::ustring>
>> {
>> static const VariantType& variant_type() { return
>> VARIANT_TYPE_OBJECT_PATH; }
>> };
>>
>> so that typed Variant looks like this:
>>
>> Glib::Variant<std::map<obj_path_t, std::map<Glib::ustring,
>> std::map<Glib::ustring, Glib::VariantBase>>>>
>>
>> and it actually works for me (cast_dynamic is OK), but IMO it should be
>> provided by the Glibmm itself. Did I overlook something? Or this is just a
>> missing feature?
>>
>>
>> BR, Andrey
>>
>
_______________________________________________
gtkmm-list mailing list
[email protected]
https://mail.gnome.org/mailman/listinfo/gtkmm-list
