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Re: Versioned pointers: a new method of representing snapshots
- To: xanadu@xxxxxxxxxx
- Subject: Re: Versioned pointers: a new method of representing snapshots
- From: Andrew Pam <xanni@xxxxxxxxxxxxxxxxx>
- Date: Thu, 10 Jul 2008 17:00:26 +0930
- Organization: Glass Wings
Daniel Phillips wrote:
> I wouldn't have guessed it. How so?
The Xanadu team did a lot of work on versioning using tree structures;
I'll have to hunt around to find the relevant documentation. See
especially the POOMfilade (Permutation Of Order Matrix Enfilade) which
provides a Variant - to - Invariant address mapping and vice versa.
Invariant addresses are analogous to underlying storage addresses, while
variant addresses are the logical addresses providing one or more