Returns the corresponding #GTypeInterface structure of the parent type
of the instance type to which g_iface belongs. This is useful when
deriving the implementation of an interface from the parent type and
then possibly overriding some methods.
Adds prerequisite_type to the list of prerequisites of interface_type.
This means that any type implementing interface_type must also implement
prerequisite_type. Prerequisites can be thought of as an alternative to
interface derivation (which GType doesn't support). An interface can have
at most one instantiatable prerequisite type.
#GType value of an interface type
#GType value of an interface or instantiatable type
Returns the #GTypePlugin structure for the dynamic interface
interface_type which has been added to instance_type, or %NULL
if interface_type has not been added to instance_type or does
not have a #GTypePlugin structure. See g_type_add_interface_dynamic().
#GType of an instantiatable type
#GType of an interface type
Returns the most specific instantiatable prerequisite of an interface type. If the interface type has no instantiatable prerequisite, %G_TYPE_INVALID is returned.
See g_type_interface_add_prerequisite() for more information about prerequisites.
an interface type
Returns the #GTypeInterface structure of an interface to which the passed in class conforms.
a #GTypeClass structure
an interface ID which this class conforms to
An opaque structure used as the base of all interface types.