On 2010 Apr 6, at 10:59 AM, Christophe Grand wrote:
The cycles are gone but the identity john-doe aand its curren-state
are still conflated so you get the same problem:
Thus, since simple trees have the exact same issues, circularity is
not the problem.
Really, to me the problem isn't creating cyclic data-structures but
updating them: the system must know which mutual references are to
the identity (and should be updated) and which are not. You have to
give this information to the system one way or the other, the system
can't guess.
To rephrase what you've said:
"the system must know which references are to the identity and
which are not."
Clojure already has that covered, but it won't do it for you behind
your back. :)
And this is not unique to circularity and it is not caused by
circularity.
There is an issue that you cannot create immutable mutual references,
but that is a -separate- issue.
Btw, to some extent, one can create cyclic data-structures in
Clojure...
I think Per was showing something similar.
Please don't blame circularity for identity/value problems. ;)
-Doug
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