[R-pkg-devel] unregistered S3 methods in a package

[Toby Hocking]

I got this warning too, so I filed an issue to ask
https://github.com/r-lib/roxygen2/issues/1654

On Mon, Sep 2, 2024 at 2:58 PM John Fox <jfox using mcmaster.ca> wrote:
>
> As it turned out, I was able to avoid redefining coef.merMod(), etc., by
> making a simple modification to the cv package.
>
> I'm still curious about whether it's OK to have unregistered S3 methods
> for internal use in a package even though that's no longer necessary for
> the cv package.
>
> On 2024-09-02 11:34 a.m., John Fox wrote:
> > Caution: External email.
> >
> >
> > Dear R-package-devel list members,
> >
> > I want to introduce several unregistered S3 methods into the cv package
> > (code at <https://github.com/gmonette/cv>). These methods have the form
> >
> >         coef.merMod <- function(object, ...) lme4::fixef(object)
> >
> > The object is to mask, e.g., lme4:::coef.merMod(), which returns BLUPs
> > rather than fixed effects, internally in the cv package but *not* to
> > mask the lme4 version of the method for users of the cv package -- that
> > could wreak havoc with their work. Doing this substantially simplifies
> > some of the code in the cv package.
> >
> > My question: Is it legitimate to define a method in a package for
> > internal use without registering it?
> >
> > This approach appears to work fine, and R CMD check doesn't complain,
> > although Roxygen does complain that the method isn't "exported"
> > (actually, isn't registered).
> >
> > Any advice or relevant information would be appreciated.
> >
> > Thank you,
> >   John
> > --
> > John Fox, Professor Emeritus
> > McMaster University
> > Hamilton, Ontario, Canada
> > web: https://www.john-fox.ca/
> > --
> >
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