I have another problem with NextMethod. Not sure if its related
to the last problem.
In this example, we have a generic called ff with methods
for AsIs and test classes. We call the generic with an
object of AsIs class. The corresponding method adds 1 to it
and then changes the class to test followed by issuing a
NextMethod. However, that results in this error (using R
2.0.0, 2004-10-04 Windows XP):
Error in NextMethod("ff") : No method to invoke
Why can't NextMethod find ff.test ?
I also tried a number of variations of this including adding x = x
to the NExtMethod argument list but none of these variations worked.
---
ff <- function(x, ...) UseMethod("ff")
ff.AsIs <- function(x, ...) {
x <- x + 1
class(x) <- "test"
NextMethod("ff")
}
ff.test <- function(x, ...) cat(x, class(x), ..., "\n")
ff(I(3))
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