list(...) evaluates the things in ...
E.g.,
> f0 <- function(x, ...) list(...)
> f0(1, warning("Hmm"), stop("Oops"), cat("some output\n"))[[2]]
Error in f0(1, warning("Hmm"), stop("Oops"), cat("some output\n")) : Oops
In addition: Warning message:
In f0(1, warning("Hmm"), stop("Oops"), cat("some output\n")) : Hmm
You can use the odd idiom substitute(...()) to get the unevaluated ...
arguments:
> f1 <- function(x, ...) substitute(...())
> f1(1, warning("Hmm"), stop("Oops"), cat("some output\n"))
[[1]]
warning("Hmm")
[[2]]
stop("Oops")
[[3]]
cat("some output\n")
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of S Ellison
> Sent: Monday, July 23, 2012 2:12 PM
> To: Jochen Voß
> Cc: r-help@r-project.org
> Subject: Re: [R] turning R expressions into functions?
>
> >> One of the things I would love to add to my package would be the
> >> ability to compare more than two expressions in one call. But
> >> unfortunately, I haven't found out so far whether (and if so, how) it
> >> is possible to extract the elements of a "..." object without
> >> evaluating them.
> >
> >Have a look at match.call.
>
> ... or use
> dotlist <- list(...)
>
> to get a list of everything included in ...
>
> S Ellison
>
> *****************************************************************
> **
> This email and any attachments are confidential. Any use...{{dropped:8}}
>
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