Returns the number of instances allocated of the particular type;
this is only available if GLib is built with debugging support and
the instance_count debug flag is set (by setting the GOBJECT_DEBUG
variable to include instance-count).
Available since:
2.44
Parameters
type
GType
A GType.
Return value
Returns:
int
The number of instances allocated of the given type;
if instance counts are not available, returns 0.