[Rd] reference classes: question on inheritance

From: Janko Thyson <janko.thyson_at_ku-eichstaett.de>
Date: Mon, 22 Nov 2010 00:31:25 +0100


Dear list,

I have a reference class which should act as a "generic" superclass for other classes. I've read the respective section at ?setRefClass and put the name of the superclass to the 'contains' argument of an example subclass (see class defs below). Classnames are set in a way that shouldn't result in collation issues (virtual def sourced before superclass def sourced before subclass). Yet, this results in the following error:

Warnmeldung:
unable to find a consistent ordering of superclasses for class "Shabubu": order chosen is inconsistent with the superclasses of "JObject"

###### CLASS DEFS #####
setClass("JObjectVirtual")
setRefClass(

	Class="JObject",
	fields=list(
		# GENERIC FIELDS (DON'T CHANGE !!!)

.BUFFER="environment",
.GENESIS="environment",
.HISTORY="environment",
.IMAGES="environment",
.LOGS="environment",
.OPTS="environment",
.PLUGINS="environment",
.TMP="environment",
.UID="character",
DATA="data.frame" # / ), contains=c("JObjectVirtual"), methods=list(
...
)

)
setRefClass(
	Class="Shabubu",
	fields=list(
		# CUSTOM FIELDS (ADAPT TO YOUR NEEDS)
		a="numeric",
		b="character",
		c="logical",
		d="data.frame",
		e="matrix",
		f="list",
		derived.field="function"
		# /
	),
	contains=c("JObject")

)

What am I doing wrong here?

Thanks,
Janko



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