I didn't find an answer elsewhere:
My package 'bit' creates a S3 generic 'clone' and exports it.
Furthermore it registers a S3 method 'clone.default' (not exported).
My package 'ff' imports package 'bit' and exports and registers a new S3
method 'clone.ff'. However, calling 'clone(ffobj)' dispatches to
clone.default instead of clone.ff !? Why?
What is the recommended way to create new S3-methods that get
dispatched? In earlier versions of the packages I simply exported
everything - that worked.
Best
Jens
> require(ff)
>
> a <- as.ff(0:9)
> class(x)
[1] "ff_vector" "ff"
>
> x <- clone(a)
> y <- bit:::clone.default(a)
> z <- clone.ff(a)
>
> # cloned ffobjects should have different filenames>
> filename(a) # original
[1] "/tmp/Rtmpk17JRZ/ff/clone1ed54cbb5060.ff"
>
> filename(x) # unexpected equal (dispatch to clone.default)
[1] "/tmp/Rtmpk17JRZ/ff/clone1ed54cbb5060.ff"
>
> filename(y) # expected equal
[1] "/tmp/Rtmpk17JRZ/ff/clone1ed54cbb5060.ff"
>
> filename(z) # OK
[1] "/tmp/Rtmpk17JRZ/ff/clone1ed551d3ee66.ff"
> version
_
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 4
minor 1.1
year 2021
month 08
day 10
svn rev 80725
language R
version.string R version 4.1.1 (2021-08-10)
nickname Kick Things
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