Re^2: The weirdest thing....

I'm nitpicking here, but note that $|++ does not increment $| when it's 1. $| is always 1 (flush) or 0 (buffer).

That means that:

# INCORRECT
sub something {
  $|++;
  # do something without buffering
  $|--;
}
[download]

Will turn on buffering even if it was off before calling the subroutine.

Usually that's not really a problem, but if you need to revert autoflush to its previous setting, you have to remember its status yourself:

#CORRECT
sub something {
  my $flush = $|++;
  # do something without buffering
  $| = $flush;
}
[download]

"What should it profit a man, if he should win a flame war, yet lose his cool?"

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Re^3: The weirdest thing.... by jdporter (Paladin) on May 09, 2007 at 21:36 UTC
`#CORRECT sub something { local $\| = 1; # do something with autoflushing }` [download]	[reply] [d/l]
Re^4: The weirdest thing.... by Joost (Canon) on May 09, 2007 at 21:38 UTC
I always forget there are uses for local(). :-) "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply]
Re^3: The weirdest thing.... by former33t (Scribe) on May 10, 2007 at 19:25 UTC
Yes, of course you are correct. It's probably even a smidgen faster to just assign a 1 to $\| than it is to perform the computation involved in incrementing. I don't think I've ever run into a situation where I wanted autoflush on a filehandle sometimes and then go back to buffering, but I'll keep that in mind. I do like the use of setting the autoflush locally in your other post.	[reply]
Re^3: The weirdest thing.... by ikegami (Patriarch) on May 12, 2007 at 16:15 UTC
I'm nitpicking here, but note that $\|++ does not increment $\| when it's 1. $\| is always 1 (flush) or 0 (buffer). You can use `=1` instead of `++` and you wouldn't have to explain this. Be nice to your reader and use `=1`.	[reply] [d/l] [select]