pugs-comm...@feather.perl6.nl wrote:
Log:
[S02] clarify that Pairs and Mappings are mutable in value, but not in key
<snip>
KeyHash Perl hash that autodeletes values matching default
KeySet KeyHash of Bool (does Set in list/array context)
KeyBag KeyHash of UInt (does Bag in list/array context)
+ Pair A single key-to-value association
+ Mapping Set of Pairs with no duplicate keys
<snip>
+As with C<Hash> types, C<Pair> and C<Mapping> are mutable in their
+values but not in their keys. (A key can be a reference to a mutable
+object, but cannot change its C<.WHICH> identity. In contrast,
+the value may be rebound to a different object, just as a hash
+element may.)
Following this change, it looks to me like Mapping is exactly the same as Hash.
So under what circumstances should one now choose whether they want to use a
Hash or a Mapping? How do they still differ? -- Darren Duncan
