Paul wrote:
> Hi, all.
> I was reading the perlsub docs and hit this speedbump:
>
>
> NOTE: The behaviour of a "my" statement modified with a
> statement modifier conditional or loop construct (e.g. "my
> $x if ...") is undefined. The value of the "my" variable
> may be "undef", any previously assigned value, or possibly
> anything else. Don't rely on it. Future versions of perl
> might do something different from the version of perl you
> try it out on. Here be dragons.
>
> I failed to parse.
> Could someone elaborate that, please? :)
a statement modifier is any of qw( if unless while until foreach ) after
an unmodified (ordinary) statement. A 'my' statement is something
like
my $x = 1;
and what this warning is saying is don't use any of the modifiers on
it, as its behaviour is undefined (not 'undef'). Stuff like this:
my $x = 1 if 0 == 1;
leaves you not knowing anything about the value in $x.
HTH,
Rob
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