self-aware list of objects able to sense constituent member alterations?

Reckoner reckoner at
Tue Jan 27 22:16:36 CET 2009

I'm not sure this is possible, but I would like to have
a list of  objects


where,  in the midst of a lot of processing I might do something like,


which alter the properties of the object 'a'.

The trick is that I would like A to be mysteriously aware that
something about the  object 'a' has changed so that when I revisit A,
I will know that the other items in the list need to be refreshed to
reflect the changes in A as a result of changing 'a'.

Even better would be to automatically percolate the subsequent changes
that resulted from altering 'a' for the rest of the items in the list.
Naturally, all of these items are related in some parent-child

that might be a lot to ask, however.

Any advice appreciated.

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