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
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