[R-pkg-devel] import 'as' from another package

[Tim Keitt]

Thanks for pointing to the bug.

Now I am finding I cannot use the 'as' definitions from 'raster' without
loading the package. Do I need an @import directive that specifies the
definitions in the 'raster' package? My understanding is that the 'setAs'
function generates a 'coerce,...' signature but I'm not sure how to import
it to my package.

Thanks again.

THK

On Mon, Jul 20, 2020 at 2:25 PM Sebastian Meyer <seb.meyer using fau.de> wrote:

> Yes, indeed, it is confusing. You don't need to file a new bug report,
> though. There is one already:
>
> https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17179
>
> Please feel free to comment there. This thread could serve as another
> confirmation. :-)
>
> Best regards,
> Sebastian
>
> Am 20. Juli 2020 18:36:21 MESZ schrieb Ben Bolker <bbolker using gmail.com>:
> >    I think this is a classic confusing R message.  Try adding methods
> >to the Imports: statement in your DESCRIPTION file and see if that
> >helps. (Maybe I should file a bug report about that error message - it
> >confuses me every time.)
> >
> >On 7/20/20 12:34 PM, Tim Keitt wrote:
> >> It works but "check" gives
> >>
> >> > checking package dependencies ... ERROR
> >>   Namespace dependency not required: ‘methods’
> >>
> >> THK
> >>
> >> On Mon, Jul 20, 2020 at 11:24 AM Ben Bolker <bbolker using gmail.com
> >> <mailto:bbolker using gmail.com>> wrote:
> >>
> >>     @importFrom methods as
> >>
> >>     ?
> >>
> >>     On 7/20/20 12:06 PM, Tim Keitt wrote:
> >>     > I have
> >>     >
> >>     >    if (!inherits(x, "RasterLayer")) x <- as(x, "RasterLayer")
> >>     >
> >>     > in a package and its not finding the coerce definition from the
> >>     raster
> >>     > package. I know I need to add an @import roxygen2 directive of
> >>     some kind,
> >>     > but I'm not sure the correct syntax. My first try generated a
> >>     warning that
> >>     > it was not needed.
> >>     >
> >>     > What is the correct way to do this? Or does raster need to
> >>     export this
> >>     > definition?
> >>     >
> >>     > THK
> >>     >
> >>     >       [[alternative HTML version deleted]]
> >>     >
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> >
> >       [[alternative HTML version deleted]]
> >
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