Glib::Variant does not feature templates for std::tuple. This makes it impossible to create Glib tuples just using Glibmm, which makes it hard to use Giomm::DBus with tuple types.

I tried following workarounds:

Glib::Variant< std::map<guint16, Glib::VariantContainerBase> > driver_map;
m_userman->get_cached_property(driver_map, "DriverList");
auto data = driver_map.get();
Throws following error:
 
In file included from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:25:0,
from /usr/include/glibmm-2.4/glibmm/object.h:34,
from /usr/include/giomm-2.4/giomm/dbusconnection.h:29,
from dbushandler.h:3,
from dbushandler.cpp:1:
/usr/include/glibmm-2.4/glibmm/variant.h: In instantiation of ‘std::pair<_T1, _T2> Glib::Variant<std::pair<_T1, _T2> >::get() const [with K = short int; V = Glib::VariantContainerBase]’:
/usr/include/glibmm-2.4/glibmm/variant.h:1722:5: required from ‘std::map<K, V> Glib::Variant<std::map<K, V> >::get() const [with K = short int; V = Glib::VariantContainerBase]’
dbushandler.cpp:88:36: required from here
/usr/include/glibmm-2.4/glibmm/variant.h:1549:48: error: ‘class Glib::Variant<Glib::VariantContainerBase>’ has no member named ‘get’
std::pair<K, V> result(key.get(), value.get());
^
/usr/include/glibmm-2.4/glibmm/variant.h: In instantiation of ‘static const Glib::VariantType& Glib::Variant<std::pair<_T1, _T2> >::variant_type() [with K = short int; V = Glib::VariantContainerBase]’:
/usr/include/glibmm-2.4/glibmm/variant.h:1643:71: required from ‘static const Glib::VariantType& Glib::Variant<std::map<K, V> >::variant_type() [with K = short int; V = Glib::VariantContainerBase]’
/usr/include/glibmm-2.4/glibmm/variant.h:1731:53: required from ‘Glib::VariantIter Glib::Variant<std::map<K, V> >::get_iter() const [with K = short int; V = Glib::VariantContainerBase]’
/usr/include/glibmm-2.4/glibmm/variant.h:1717:30: required from ‘std::map<K, V> Glib::Variant<std::map<K, V> >::get() const [with K = short int; V = Glib::VariantContainerBase]’
dbushandler.cpp:88:36: required from here
/usr/include/glibmm-2.4/glibmm/variant.h:1520:29: error: ‘variant_type’ is not a member of ‘Glib::Variant<Glib::VariantContainerBase>’
Variant<V>::variant_type().gobj()));

I also tried this second approach:​
​
Glib::Variant< std::map<guint16, Glib::Variant<std::vector<Glib::VariantBase> > > > driver_map;
m_userman->get_cached_property(driver_map, "DriverList");
auto data = driver_map.get();
​
Which throws following error at runtime:
(launcher:10778): GLib-CRITICAL **: the GVariant format string 'a{qv}' has a type of 'a{qv}' but the given value has a type of 'a{q(qsb)}'

(launcher:10778): GLib-CRITICAL **: g_variant_get: assertion 'valid_format_string (format_string, TRUE, value)' failed

(launcher:10778): GLib-CRITICAL **: g_variant_iter_next_value: assertion 'is_valid_iter (iter)' failed