On 31 December 2011 08:08, Meikel Brandmeyer <m...@kotka.de> wrote:
> I think, what James wants to say is: serialising reference types is
> non-trivial. Reference types are identities. So the instance itself (as in
> identical?) carries information. When you have references to a ref you have
> to make sure that they all refer to the same ref again after thawing. Let's
> say you have a data structure like this:
>
> (let [left-and-right (ref :state)]
> {:left left-and-right :right left-and-right})
>
> What is the state of this map after thawing? Does it refer to the same ref?
> Or different ones? If it's different ones, your program is broken now. If
> left-and-right was a value, the program would now need more memory, but it
> would be still ok.
This is pretty much what I was trying to say, but Meikel puts it far
more clearly than I managed to.
Serializing refs just seems such a briar patch that I'd prefer an
exception be raised so I know something is wrong.
- James
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