The type of the @introspect function in #GDBusSubtreeVTable.
Subtrees are flat. @node, if non-%NULL, is always exactly one
segment of the object path (ie: it never contains a slash).
This function should return %NULL to indicate that there is no object
at this node.
If this function returns non-%NULL, the return value is expected to
be a %NULL-terminated array of pointers to #GDBusInterfaceInfo
structures describing the interfaces implemented by @node. This
array will have g_dbus_interface_info_unref() called on each item
before being freed with g_free().
The difference between returning %NULL and an array containing zero
items is that the standard DBus interfaces will returned to the
remote introspector in the empty array case, but not in the %NULL
case.
The type of the @introspect function in #GDBusSubtreeVTable.
Subtrees are flat. @node, if non-%NULL, is always exactly one segment of the object path (ie: it never contains a slash).
This function should return %NULL to indicate that there is no object at this node.
If this function returns non-%NULL, the return value is expected to be a %NULL-terminated array of pointers to #GDBusInterfaceInfo structures describing the interfaces implemented by @node. This array will have g_dbus_interface_info_unref() called on each item before being freed with g_free().
The difference between returning %NULL and an array containing zero items is that the standard DBus interfaces will returned to the remote introspector in the empty array case, but not in the %NULL case.