Re: [Rd] S3 methods in default namespace

From: Hadley Wickham <>
Date: Mon, 29 Aug 2011 07:20:00 -0500

>> So doesn't that break packages that use S3 but don't have a NAMESPACE?
> Maybe, but since the methods are exported as functions they are also found
> for method dispatch and imported, if another package imports from the
> Namspace. The problem I see is what happens if method dispatch is done on a
> package that is not attached but just the Namespace is only loaded.
> Anyway, we should really recommend that package authors write NAMESPACE
> files in case their packages are not trivial.
> Note that there are many CRAN packages that fail under R-devel, some of them
> sue to NAMESPACE issues.

I'm not sure I understand the approach of providing a default NAMESPACE. Why not just make it a requirement to pass R CMD check? That seems like it would be a safer approach, although it would create some work for people who have not yet started using namespaces.


Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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