On 05/15/2017 07:28 AM, peter dalgaard wrote:
I think Hervé's idea was just that if switch can evaluate arguments selectively, so can stopifnot().
Yep. Thanks, H.
But switch() is .Primitive, so does it from C. I think it is almost a no-brainer to implement a sequential stopifnot if dropping to C code is allowed. In R it gets trickier, but how about this: Stopifnot <- function(...) { n <- length(match.call()) - 1 for (i in 1:n) { nm <- as.name(paste0("..",i)) if (!eval(nm)) stop("not all true") } } Stopifnot(2+2==4) Stopifnot(2+2==5, print("Hey!!!") == "Hey!!!") Stopifnot(2+2==4, print("Hey!!!") == "Hey!!!") Stopifnot(T,T,T,T,T,T,T,T,T,T,T,T,T,T,T,T,F,T)On 15 May 2017, at 15:37 , Martin Maechler <maech...@stat.math.ethz.ch> wrote: I'm still curious about Hervé's idea on using switch() for the issue.
-- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org Phone: (206) 667-5791 Fax: (206) 667-1319 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
