[Pharo-users] How to intercept every instance variable write on all objects

[Petr Fischer via Pharo-users]

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Hello, 

is possible to intercept (before writeú all instance variable writes on every 
existing objects?

I found a discussion here:
http://forum.world.st/Is-it-possible-to-follow-an-object-through-a-computation-td5092459.html

Known solutions:

1) jugglery with object read only state + ModificationForbidden - not ideal, 
it's probably slow via exceptions and every nested on:do: stop change detection

2) it's possible to do it via slots - but it does not work on any existing 
object (only on my specially prepared objects with slots)

3) Metalinks - it's based on intercepting method calls, right? But I need to 
intercept direct instance variable write, so probably not possible

Is there any way? Thanks! pf

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