Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?

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.

  • Comment on Re: Should loop {} really loop indefinitely?

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1057632]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (4)
As of 2018-05-27 14:17 GMT
Find Nodes?
    Voting Booth?