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Re: Should loop {} really loop indefinitely?

by sundialsvc4 (Abbot)
on Oct 09, 2013 at 23:15 UTC ( #1057632=note: print w/replies, xml ) Need Help??

in reply to Should loop {} really loop indefinitely?

Obviously, a string of empty-statements (should...) generate no code at all, no matter how many repetitions there are.   This is purely a syntactic construct; not a semantic one.

The only way to know what the Perl Implementors (ommmm ....) actually did, is to look for yourself at perlguts (or its v6 equivalent).   But it is fair to predict that they only concerned themselves with real-world probable cases, not hypothetical ones.   (There are no Whetstones to be dealt with here ...)   Therefore, the mere existence of an empty <body> probably isn’t enough by itself to cause no code at all to be generated.   After all, many Perl programs live-and-die by their “side effects,” that is, what happens in the conditional-block that controls a loop vs. the loop itself.   Would the optimizer be smart-enough to omit a block that was altogether empty?   Guess it depends on whether the author of the thing cared to test for it.   Most likely, it wasn’t worth the bother.

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[ambrus]: I'm currently in the process of rewriting my proof of concept programs. They sort of developped organically as I was experimenting, so now I've got an ugly mess of multiple programs and one-liners held together by nothing. I'll have to rewrite them to som
[ambrus]: ething that's both cleanly organized and mostly automated.
LanX in train, bad connection
[Corion]: ambrus: Yeah - we're in that situation too, except that there is no time to do the reorganizing :-/
[LanX]: ... so my boss started a project with the newest sun servers and invited the traders to come on weekend to test it... and they were so pleased, that they forced him to keep it in production...
[ambrus]: Corion: sure, this is the long-term plan. The short term is that I have to run this ungodly mess to get results from the new input data today.
[Corion]: ambrus: Most of our "automation" is tied to process exit codes and a shell pipeline :-\
[LanX]: ... a week later they realized that one of the databases - which recorded how much the other banks due to this bank - was not correctly plugged

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