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Re: Watchpoints for emacs lisp.


From: alin.s
Subject: Re: Watchpoints for emacs lisp.
Date: Tue, 11 May 2010 08:37:42 -0700 (PDT)



Stefan Monnier wrote:
> 
>> I insert to the struct Lisp_Symbol a field :watched: .
> 
> No, that would add 8 more bytes to every symbol for a feature that's
> almost never used.
> 
> I think a good starting point is to use the existing `constant'
> field and just add a special WATCHED value to it (it already has 2bits
> but only uses 1, so you don't even need to make the field any larger).
> 

I did not know about that bit!


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