Dear All,
In R 3.6.3 (and earlier), method dispatch used to work for methods stored in
local environments that are attached to the search path. For example:
myfun <- function(y) {
out <- list(y=y)
class(out) <- "myclass"
return(out)
}
print.myclass <- function(x, ...) print(formatC(x$y, format="f", digits=5))
myfun(1:4)
# prints: [1] "1.00000" "2.00000" "3.00000" "4.00000"
rm(print.myclass)
myenv <- new.env()
myenv$print.myclass <- local(function(x, ...) print(formatC(x$y, format="f",
digits=5)), myenv)
attach(myenv)
myfun(1:4)
# still prints: [1] "1.00000" "2.00000" "3.00000" "4.00000"
But since R 4.0.0, this no longer words and the above prints:
$y
[1] 1 2 3 4
attr(,"class")
[1] "myclass"
Is this intended? And is there a way to still make this work?
Best,
Wolfgang
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