[Rd] Wishlist: Writing R Extensions suggestions RE: [R] vague errors on R CMD check for very minimal S4-style package (PR#8944)

[Steven.Roels at mpi.com]

Ah yes. There they are right on page 4 of "Writing R Extensions".

The "LazyLoad: yes" was sufficient to avoid the check errors, but I'll
add the "Depends: methods" as well.

For the manual-impaired like me, it _may_ be worth reiterating these two
requirements in section 1.6.6 "Name spaces with formal classes and
methods" - right where the .onLoad requirement is mentioned.  

Also, at may be worth mentioning in "Writing R Extensions" that the
stats4 package can serve as a template/example for S4-style packages (at
least a quick search for "stats4" didn't find anything there or in the
FAQ).

Thanks to you both.

-Steve

>This is an S4-using package but missing a dependence on 'methods'.
>
>To run R CMD check the package has to load under minimal conditions,
e.g.
>
>R_DEFAULT_PACKAGES=NULL R
>...
>> library(foo)
>
>should work.  'methods' is quite expensive to load, and so is only used
in
>checking if explicitly requested.

>> Try adding LazyLoad: yes to DESCRIPTION (or SaveImage: yes).
>>
>And
>
>Depends: methods
>
>Package stats4 is provided in part as an example of a small S4-using
>package for people to copy.


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Steve Roels, Ph.D.                       
Senior Scientist I
Computational Biology               Phone: (617) 761-6820
Millennium Pharmaceuticals, Inc.    FAX:   (617) 577-3555
640 Memorial Drive                  Email: roels at mpi.com
Cambridge, MA 02139-4815
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