gTypeGetAncestors(type)
gTypeGetInterfaces(type)
gTypeFromName(name)
gTypeGetClass(type)
gTypeGetSignals(type)GType, either its name or numeric value, see belowGTypegTypeGetAncestors returns a vector of type names from which
type inherits.gTypeGetInterfaces names the interfaces implemented by
type.gTypeFromName retrieves the numeric value of a type from its
name.gTypeGetClass returns the class instance for the type, for
example GtkWidgetClass.gTypeGetSignals returns a list of signal ids with names for the
signals supported by the type.
GType system supports inheritance and interfaces, enabling the
psuedo-object-oriented system known as GObject. However, they
also encompass all fundamental (primitive) types.A GType is considered a transparent-type in RGtk2,
since you may specify one as either the type name or the numeric value
retrieved from some API function like gTypeFromName. The
GType system obviously names primitive types different from the
corresponding types in R, but this is automatically taken care of for
you, so you can use R type names (ie, "character", "logical", etc) when
specifying a GType. This means that gTypeFromName is not
that useful to the RGtk2 programmer.
All R objects representing external RGtk2 objects have their hierarchy
stored in the class attribute. Everything descends from
"RGtkObject", then, for example, "GObject", etc. The types do not
necessarily correspond to GTypes, but they do for all
GObjects and others. Thus, gTypeGetAncestors is also of
little use unless one is working with pure GTypes.
GObject