Hi, 3) Metalinks - it's based on intercepting method calls, right? But I need to intercept direct instance variable write, so probably not possible no, you can attach metalink to any AST node, including an Assignment Node. Some years ago I've made a small utility for this that also auto-reinstalled when the method has changed. Should work with P6, not sure about the current P7 https://github.com/peteruhnak/metalinks-toolkit . But of course you can attach the MetaLink directly. P On Fri, Feb 1, 2019 at 12:43 AM Petr Fischer via Pharo-users < pharo-users@lists.pharo.org> wrote:

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-computati...

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