From: Mehdi Adda <mehdi.adda@...>
Date: 2008-06-14T07:24:21+09:00
Subject: fire event when the value of a variable is changed

hi !

what is the best way to execute a given method each time the value of a
given variable is changed.

I have told that if the value of the variable is changed via a sitter,
it's possible to use a method chaining. How if there is no setter ?

Thanks in advance,

Addame
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