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Newsgroups: comp.lang.forth
From: Josh Grams <j...@qualdan.com>
Date: 31 May 2012 16:45:15 GMT
Local: Thurs, May 31 2012 12:45 pm
Subject: Re: More on Boolean Shortcircuiting
Arnold Doray wrote: <jq822d$4a...@dont-email.me>
Yes.
> The "problem" I see with THROW's behaviour is that just *before* an > exception is thrown, the stack could have been: > A) Added to -- in which case THROW does a useful thing by dropping all > B) Depleted -- in which you get junk on the stack. You have to manually Yes, but only to a known depth. Forth words never disturb the stack
> clean these or drop the entire stack. > C) Muddled (ie, items added to / removed ) -- in which case you are beyond their arguments. If they used deeper elements in the stack, those would also be considered arguments and would (hopefully) be declared in the stack effect. So in B and C, when THROW restores the depth, all you have to do is drop
--Josh
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