KeyedSet

[Chris Muller]

Hi Keith, please be sure to checkout this page:

  http://minnow.cc.gatech.edu/squeak/5722

and scroll to the bottom where it says "CAUTION: Unsupported". 
KeyedSet is (implicitly) part of that list.

Set and Dictionary are handled "logically" to avoid spurious, false
change detection.  For a detailed explanation,

 
http://lists.squeakfoundation.org/pipermail/squeak-dev/2004-July/079600.html

To avoid this problem, Magma handles Sets and Dictionary's
logical-representation with indexed instance variables (i.e., stored
and retrieved like Array's).  The cost of doing this is, it exposes a
limitation of Magma that I have not yet had time to fix; support for
both named and indexed variables in the same class.

KeyedSet adds a named instance variable to a class that Magma treats as
indexed, so it is not supported.  It definitely can be, and if you wish
to work on it I would be grateful.  But it will require some careful
changes to "Ma object serialization" package and probably "Ma traverse
object graphs" too.

Regards,
  Chris

--- Keith Hodges <Keith.Hodges at warwick.ac.uk> wrote:

> I was thinking to myself that I need a nice easy way of bunging
> objects
> into a collection and getting them out again. Kind of like a
> Dictionary
> where you can retrieve and object on a key, but kind of like a Set
> too.
> I thought I know what a Set which has Keyed behaviour! Lo and behond
> I
> found just the ticket. KeyedSet! Fantastic. I popped it into my root
> object in my brand new database. Copied loads of data over and slept
> on it.
> 
> This morning I open a session on my database and discover that  when
> Magma loads the database back in it appears to have lost its
> keyBlock:
> 
> chris?
> 
> best regards
> 
> Keith
> 
> 		
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