[R] deparse(substitute(x)) on an object with S3 class

[R. Michael Weylandt]

Note that print.testclass(testlist) also works as expected so it might
be there's a forced evaluation somewhere inside S3 dispatch -- I was
playing around with this the other day, having gotten myself confused
by it and stumbled across the internal logic (or at least something
that made sense to me), though I seem to have forgotten it again.
Hopefully someone else can clarify.

Michael

On Thu, May 3, 2012 at 6:15 AM, Remko Duursma <remkoduursma at gmail.com> wrote:
> Dear list,
>
>
> can someone explain to me why deparse(substitute(x)) does not seem to work
> when x is of a user-defined S3 class?
> In my actual problem, my print method is part of a package, and the method
> is registered in the NAMESPACE, if that should make a difference.
>
>> print.testclass <- function(x,...){
>  xname <- deparse(substitute(x))
>  cat("Your object name is",xname,"\n")
> }
>
> testlist <- list()
> testlist[[1]] <- 1:10
> class(testlist) <- "testclass"
>
> # This does not work as expected:
>> testlist
> Your object name is structure(list(1:10), class = "testclass")
>
> # But this does :
>> testlist2 <- unclass(testlist)
>> print.testclass(testlist2)
> Your object name is testlist2
>
>
>
> thanks,
> Remko Duursma
>
>
> --
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>
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