Hello,
list2env generates an error on empty lists.
> l <- list()
> list2env( l )
Erreur dans list2env(l) : names(x) must be valid character(length(x)).
This is consistent with the requirement that the list must be a
__named__ list, so this works:
> names(l) <- character(0)
> list2env( l )
<environment: 0x102b8fbc8>
But I was wondering if it would make sense to make a special case of
zero sized lists, with this:
Index: src/main/envir.c
===================================================================
--- src/main/envir.c (revision 52910)
+++ src/main/envir.c (working copy)
@@ -1555,7 +1555,7 @@
x = CAR(args); args = CDR(args);
n = LENGTH(x);
xnms = getAttrib(x, R_NamesSymbol);
- if (TYPEOF(xnms) != STRSXP || LENGTH(xnms) != n)
+ if (n && (TYPEOF(xnms) != STRSXP || LENGTH(xnms) != n) )
error(_("names(x) must be valid character(length(x))."));
envir = CAR(args); args = CDR(args);
if (TYPEOF(envir) == NILSXP) {
Romain
Romain Francois Professional R Enthusiast +33(0) 6 28 91 30 30 http://romainfrancois.blog.free.fr |- http://bit.ly/cCmbgg : Rcpp 0.8.6 |- http://bit.ly/bzoWrs : Rcpp svn revision 2000 `- http://bit.ly/b8VNE2 : Rcpp at LondonR, oct 5th