Author: allison
Date: Tue Jul 17 11:59:34 2007
New Revision: 19934
Modified:
trunk/docs/pdds/draft/pdd17_pmc.pod
Log:
[pdd] Add a note to PMC PDD on return values for unset elements of aggregate
PMCs.
Modified: trunk/docs/pdds/draft/pdd17_pmc.pod
==============================================================================
--- trunk/docs/pdds/draft/pdd17_pmc.pod (original)
+++ trunk/docs/pdds/draft/pdd17_pmc.pod Tue Jul 17 11:59:34 2007
@@ -105,6 +105,14 @@
pmclass Foo does bar extends baz is_core {
+=item *
+
+ResizablePMCArray returns Undef for unset elements (so does the new object
+model, because it uses ResizablePMCArray for storage), but Hash returns null.
+Various other PMCs return different values for undefinedness. Pick a standard.
+The current favorite is a singleton Null PMC. Check the implementation of
+PMCNULL.
+
=back
=head1 DESCRIPTION
