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To:	geda-user AT delorie DOT com, Markus Hitter <mah AT jump-ing DOT de>
Subject:	[geda-user] Re: Objects of objects
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Comments:	In-reply-to Markus Hitter <mah AT jump-ing DOT de>
	message dated "Thu, 01 Nov 2012 21:46:45 +0100."
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Date:	Thu, 1 Nov 2012 22:34:05 +0100 (CET)
From:	karl AT aspodata DOT se (Karl Hammar)
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Markus Hitter:
> Am 01.11.2012 15:31, schrieb Karl Hammar:
> > Kai-Martin Knaak:
> >> The break condition would need to be implemented. Until it is, you'd be
> >> stuck in an endless loop.
> >
> > There is always the hw limit. If people wants endless loops let them
> > have it. You cannot outlaw stupidity, but forbiddning useful things
> > because of stupidity is not nice to the nice guys.
> 
> Please don't forget those being reasonably intelligent, still building a 
> recursion accidentally. Grinding the user's whole system to a halt with 
> exhaused memory due to a typo won't make you and gEDA friends.
> 
> IMHO, there should be at least an recursion counter, like max. 100 
> recursions.

Fine with me.

> Still I can't see how "real" recursions can work. Real recursions would 
> require to change the recursed item somehow and testing this change to 
> reach a limit. So, the recursion should break as soon as the same 
> symbol/schematics is detected a second time in the recursion loop.

I don't think "real" recursion in the sense that a symbol loads 
itself recuresivly would have any value, but who knows.

I'm more interested in being able to make a subcircuit from symbols,
and the subcircuit can be assembled into new subcircuits and so on.
We can do so in a way today but loading symbols from symbols is not
officially supported and it would also be useful to pass along some
parameters to the subcircuit.

Some simple examples:
. one could have a led and resistor, and given the applied voltage to
  the subcircuit it would calc it's resistor value, 
. a low pass filter circuit with cutoff freq. as a parameter

Regards,
/Karl Hammar

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