Glib::VariantBase usage examples

[Povietkin Konstantin <povetkin k gmail com>]

Hi, all!
The result of Gio::DBus::call_sync is a Glib::VariantBase instance of
type "ao", which, in my opinion, is Glib::Variant< std::vector<
Glib::ustring > >.

What is the wright way to cast it to Glib::Variant< std::vector<
Glib::ustring > > with Glib::VariantBase::cast_dynamics?

I think I miss something, but I don't understand what one. 
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