Quoth William Dunlap on Setting Orange, the 72nd of Discord:
> > f <- function(...) {
> + dotArgList <- substitute(list(...))
> + dotArgList
> + }
> > f(cat("foo\n"), stop("Oops"), warning("Hmm"))
> list(cat("foo\n"), stop("Oops"), warning("Hmm"))
> > # i.e., no argument was evaluated
Thanks, William! Something like this works perfectly:
> debug <- function(...) {
+ promises <- as.list(substitute(list(...)))[-1]
+ str(structure(Map(eval, promises),
+ names=Map(deparse, promises)))
+ }
>
> a <- 2
> debug(a, a + a)
List of 2
$ a : num 2
$ a + a: num 4
>
For some reason, I had tried every permutation of `substitute', `list'
and `...' except that one; coming to the erroneous conclusion that I
couldn't avoid eval-ing `...'.
I may have to screw around with the evaluation environment; but,
otherwise, this is fantastic!
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