On 30/06/2015 1:57 PM, Hadley Wickham wrote: > A slightly simpler formulation of the problem is: > > show <- function(...) stop("My show!") > methods::setClass("Person", slots = list(name = "character")) > methods::new("Person", name = "Tom") > #> Error in (function (...) : My show!
Just to be clear: the complaint is that the auto-called show() is not methods::show? I.e. after x <- methods::new("Person", name = "Tom") you would expect show(x) to give the error, but not x ?? Duncan Murdoch > > Hadley > > On Tue, Jun 30, 2015 at 9:02 AM, Dean Attali <daatt...@gmail.com> wrote: >> Hi r-devel >> >> If you define a function named `show` or attach a package with an exported >> `show` function, then printing/vieweing S4 objects breaks. This is probably >> because the `print` function calls `show`, which is now masked. >> >> Example: >> >> show <- function() {} >>> setClass("Person", slots = list(name = "character")) >>> tom <- new("Person", name = "Tom") >>> tom # error >>> methods::show(tom) # works >> >> >> The error was a surprise to me because I was under the assumption that >> `show` would be namespaced and therefore should not break. >> I'm wondering if this is intended behaviour, or if this is a problem. My >> intuition, and Hadley agreed on Twitter, is that defining a `show` method >> should not have such a grave effect on printing S4 objects. >> >> Thanks >> >> --- >> http://deanattali.com >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel