From: "Dr.Ruud" <[EMAIL PROTECTED]>
> Rob Dixon schreef:
> > Dr.Ruud:
> >> John W . Krahn:
>
> >>> /Powerball:/ and my @numbers = /\d+/g;
> >>
> >> I wouldn't use such a conditional "my".
> >
> > There is no conditional 'my': it is a de[c]laration.
>
> I call it a conditional "my". A "my" can be just a declaration, or a
> declaration and an initialisation. In this case only the initialisation
> is conditional.
>
> A "my" in a condition has special behaviour if the condition is constant
> false: "0 and my $var;" creates a static $var.
>
> As I wrote: *I* wouldn't use *such* a conditional "my". I put the
> declaration on its own line, just before the conditional initialisation.
>
> I sometimes use a conditional my if I want the static behaviour, but not
> in production code. Perl 5.10 has "static".
Perl 5.x has
{
my $static;
sub foo {
$static++;
...
}
}
which even lets you create variables that are shared by several
subroutines.
I do understand you might want to use my() like this:
open my $FH, '>', $filename or die $^E;
or
if (my $foo = foo($x, $y, $z) and my $bar = bar(1,2,3)) {
and use $foo and $bar here
}
but I'd definitely never ever do
condition and my $x = blah();
and if
0 and my $x;
creates a static $x I call it a bug.
Jend
===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz =====
When it comes to wine, women and song, wizards are allowed
to get drunk and croon as much as they like.
-- Terry Pratchett in Sourcery
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
http://learn.perl.org/
