Re: [Rd] Changes to correct problems with classes in namespaces

From: Prof Brian Ripley <>
Date: Wed 25 Aug 2004 - 03:59:39 EST


Looks like several packages are failing to dump or load with messages like (SparseM)

Error in warning("Undefined slot classes in definition of \"", classDef@className, :

        Object "classDef" not found

So far I have seen this with SparseM, dynamicGraph (and hence deal and gRbase). Should that be `ClassDef'? And is this a new error detected?


On Tue, 24 Aug 2004, John Chambers wrote:

> An extensive set of changes to the methods package has been committed
> today to allow non-exported classes from packages with namespaces (and
> some related fixes in dealing with generic functions from namespaces as
> well).
> The namespace mechanism requires packages to export any class
> definitions that are part of the API. Unfortunately, NOT exporting
> classes has never really worked.
> The problem was essentially that computations such as method dispatch
> used the character-string name of a class, with no information about
> where that class came from. For non-exported classes, this caused many
> computations down the line to fail. Related problems came from not
> using the generic function objects and the class definition objects.
> The modified code passes the usual check and check-devel tests, plus
> some tests for dealing with private classes, but if you have packages
> that use methods extensively, please try these with the current r-devel
> as soon as possible.
> John

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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