Bob Showalter wrote:
>
> > From: Chad Kellerman [mailto:[EMAIL PROTECTED]]
> >
> > I have only been writing perl for a few months, so forgive
> > me if this
> > sounds stupid.
>
> No, it's an excellent question.
>
> > what is the difference between:
> >
> > $| = 1;
> > and
> > $|++;
>
> The first assigns the value 1 to the variable $|
> The second increments (adds 1 to) the current value of $|
>
> $| is a "special" variable to Perl. It controls the automatic flushing of
> output filehandles after a print(). The default is 0, which means no
> auto-flush. Setting it to 1 (or any non-zero value) enables the
> auto-flushing.
>
> Assuming these statements appeared at the top of the program, the effect
> would be the same for each. I prefer the first form to the second, since it
> is not dependent on what other code may or may not be doing to $| (i.e.
> consider if $| were -1 prior to the increment).
^^^^^^^^^^^^^
It's not going to happen Bob! :-) $| is very magical and can only hold
the values zero and one.
$ perl -le'for (-5, -1, 0, 1, 5) {$| = $_; print $|}'
1
1
0
1
1
Also, $| has an interesting property when you decrement it.
$ perl -le'for (1 .. 6) {$|--; print $|}'
1
0
1
0
1
0
Which it doesn't have when you increment it.
$ perl -le'for (1 .. 6) {$|++; print $|}'
1
1
1
1
1
1
John
--
use Perl;
program
fulfillment
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