org.freedesktop.DBus.ObjectManager in glibmm?

[Johannes Dohmen <johannes dohmen amano eu>]

Hi there.

I have a question regarding glibmm and its dbus implementation.
Does glibmm (directly) support an ObjectManager 
(org.freedesktop.DBus.ObjectManager) like Gio (I think) does? If not is 
there a different/better approach to answer a "GetManagedObjects" call I 
receive through dbus?

At the moment I try to provided an answer through a allback given by 
Gio::DBus::InterfaceVTable

However I cannot construct a valid answer and I am not sure if this is 
the proper way of doing it.
Anyway, I tried the following:

typedef std::map<Glib::ustring, map<Glib::ustring, 
std::map<Glib::ustring, Glib::VariantBase> > > managed_objects_t;
Glib::Variant<managed_objects_t> response = 
Glib::Variant<managed_objects_t>::create(tmp);
invocation->return_value(Glib::Variant<managed_objects_t>::create_tuple(response));

But when the callback is executed I get:
(process:22695): GLib-GIO-WARNING **: Type of return value is incorrect: 
expected '(a{oa{sa{sv}}})', got '(a{sa{sa{sv}}})''

I cannot change the first template argument of managed_objects_t to
Glib::VariantStringBase
which could hold an Object-path, but does not have operator< implemented 
(needed for std::map).

Background information:
I think I need this because bluez seems to rely on the GetManagedObjects 
method of the ObjectManager interface.

Thanks for your help

Johannes

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