Am am missing something or does the new ...names() in R-devel not work
right?
> a <- function(x, ...) ...names()
> a(a=stop("a"), b=stop("b"))
[1] "a" ""
> a(stop("x"), stop("unnamed"), c=stop("c"), d=stop("d"))
[1] NA "" ""
> version
_
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status Under development (unstable)
major 4
minor 1.0
year 2020
month 05
day 19
svn rev 78492
language R
version.string R Under development (unstable) (2020-05-19 r78492)
nickname Unsuffered Consequences
The following seems to do the right thing
alt...names <- function() evalq(names(substitute(...())),
envir=parent.frame())
However I wonder if it would be better to give the user a function, say
...args_unevaluated(...) to get the unevaluated ... arguments directlly
without having to know about the substitute(...()) trick. Then the user
could get the length, the n'th, or the names using the usual length(), [[,
and names() functions instead of ...length(), ...elt(), and ...names().
Bill Dunlap
TIBCO Software
wdunlap tibco.com
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