[squeak-dev] Re: immutibility

Igor Stasenko siguctua at gmail.com
Thu Mar 18 18:03:23 UTC 2010

On 18 March 2010 19:11, Brent Pinkney <brent at zamail.co.za> wrote:
> Ahoy,
> I would like to contribute to this thread by explaining a problem that occurs often in telecommunications and logistics.
> It is common to have planning tools that allow the user to 'fork' the master view of the 'domain model' and make local changes to
> explore "what ifs". Alas. the domain model is a directed graph of many thousands of instances, born of hundreds of classes, so
> duplicating all of this is not feasible.
> I have always wanted an object mechanism to detect 'copy of write', so that I might slay this pesky problem. If I had "OCOW"
> (Object Copy on Write), I could let the happy users work on the master object graph and manage the small portion that was changed
> by an such user experimentation. Obviously, there would need to be a nice exceptions or dependencies to wrap all this.
> My question (I really do not know) then is: does immutability, as proposed in this thread, help ?
I saw a paper which addressing exactly this problem, as well as an
If i'm not mistaken, Lucas Renggli wrote it.

> Brent

Best regards,
Igor Stasenko AKA sig.

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