Forgive the multiple posts, but I am resending a issue under a new
subject so it doesn't get lost. There is inconsistent behavior between
is and extends for class ANY. All classes (even non-existent ones)
extend ANY according to methods::extends, but only S4 objects are of
class ANY according to methods::is. This could be reconciled if is()
checked if methods:::.identC(class2, "ANY") before it performed an
S3Case test.
> is(factor(), "ANY")
[1] FALSE
> extends("factor", "ANY")
[1] TRUE
> is(lm(I(1:10) ~ rnorm(10)), "ANY")
[1] FALSE
> extends("lm", "ANY")
[1] TRUE
> sessionInfo()
R version 2.10.0 Under development (unstable) (2009-09-07 r49613)
i386-apple-darwin9.8.0
locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Patrick
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