setGeneric("unique")
setClass("A")
unique.A <- function(x, incomparables=FALSE, ...) {}
setMethod(unique, "A", unique.A)
Both S3 and S4 methods need to be exported in the NAMESPACE
import(methods)
S3method(unique, A)
exportMethods(unique)
PkgB introduces a new class and method
setClass("B")
unique.B <- function(x, incomparables=FALSE, ...) {}
setMethod(unique, "B", unique.B)
and in the NAMESPACE has
import(methods)
importFrom(PkgA, unique)
S3method(unique, B)
exportMethods(unique)
Unfortuantely, R CMD check says that
* checking whether package 'PkgB' can be installed ... WARNING
Found the following significant warnings:
Warning: found an S4 version of 'unique' so it has not been imported correctly
See '/home/mtmorgan/tmp/PkgB.Rcheck/00install.out' for details.
This is from (svn r61253) R-devel/src/library/base/R/namespace.R:1339, where the
code finds the S4 generic, but not the S3 generic. Obviously the namespace
cannot have both the S3 and S4 symbols defined, but this seems to be required? A
workaround might extend the check to include getGeneric(genname)@default.
This scenario is reproducible in the attached tarball tar xzf PkgAB.tar.gz R CMD INSTALL PkgA R CMD check PkgB Martin Morgan -- Computational Biology / Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: Arnold Building M1 B861 Phone: (206) 667-2793
PkgAB.tar.gz
Description: GNU Zip compressed data
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