Dear all,
I was wondering if they were a way to define a record type with identity as
an equality semantic?
(defrecord A[]
Object
(hashCode ...)
(equals ...))
do not work.
Is there a way to do that?
(Defining a deftype around the defrecord is a bit annoying)
Best regards,
Nicolas.
--
No. Use identical? if you want to test for object identity. IIRC
Rich commented that the inability to override equals/hashCode was
intentional as value equality was the correct approach. See
http://clojure.org/state
On Jul 17, 7:00 am, Nicolas Oury wrote:
> Dear all,
>
> I was wondering if th
Well. I totally agree that value equality is the correct approach. And I am
very happy it is the default.
But, in some situations, you want to have accessors but do want to have
identity as an equality.
You cannot use identical? in Clojure data structures, for example.
I am in a situation where
More specifically, I am trying to build Hash Consed trees whose nodes are
records.
http://en.wikipedia.org/wiki/Hash_consing
This is a necessary step in a lot of algorithms. It is a benefit of being
principled about not mutating values.
And it can not be implemented, without overriding hashCode
