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unique
2011 Dec 15
1
S4 NAMESPACE method imports and exports do not include (promoted?) generics
...setMethod(unique, "B",
function(x, incomparables=FALSE, ...) unique(x at b))
NAMESPACE:
importFrom(PkgA, unique)
exportClasses(B)
exportMethods(unique)
and PkgC wants to import PkgB's classes and methods
DESCRIPTION
Imports: methods, PkgB
R/f.R
cunique <- function(x) unique(x)
NAMESPACE
importMethodsFrom(PkgB, unique)
export(cunique)
then
(a) the 'unique' generic is not available to the user of PkgB
> library(PkgB)
> unique(new("B", b=1:5))
Error in unique.default(new("B", b = 1:5)) :
unique(...