On 9/23/05 6:32 AM, Uwe Voelker wrote:
> Rose::DB::Object line 240:
>
>> $self->{STATE_IN_DB()} = 1;
>> return $self || 1;
>> }
>
> Doesn't this lead to an error? If $self is undef (or false) how can you
> assign the STATE_IN_DB flag? Or does $self override the stringification
> (or something else)?
>
> I'm confused ;-)
The "... || 1" is there just in case $self has its boolean value overloaded
with the overload.pm module. In Perl 5, all references are "true" normally,
but it's possible to change that if you really want to:
package Foo;
#use overload bool => sub { 0 };
bless $o = {}, 'Foo';
$o || print "$o is false!\n"; # this prints the msg
If someone does that with an RDBO-derived class, then they can't use the
shortcuts. But it's not very common, and the behavior is documented. Plus,
the "long way" is not very long anyway :)
-John
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