Re: Re: Re: Re: OO - problem with inheritance

[uwevoelker]

Hello Ilya,
I need your help. I have written an Parameter::Validate module. And now I would like to use it as you said.

use strict;
use lib  '/home/uwe/cvs/perl';
use lib  '/home/uwe/cvs/perl/module';
use Parameter::Validate;
use base 'CCS::Data::Datatype::base_class';

# parameter configuration
#my $pv = CCS::Data::Datatype::base_class->pv->clone;
my $pv = SUPER->pv->clone;
$pv->enable(qw(mandatory min_length max_length));
$pv->change(max_length => {max => 255, default => 255},
            min_length => {max => 255});
sub pv { $pv; }

If I use the full qualified parent class name (CCS::Data::Datatype::base_class->pv) everything works like expected. But if I use the line with SUPER->pv I get an error: Can't locate object method "pv" via package "SUPER" (perhaps you forgot to load "SUPER"?) at /home/uwe/cvs/perl/CCS/Data/Datatype/String.pm line 16.
So, what is wrong with SUPER?

Thank you, Uwe

[IlyaM]

I'm sorry I gave you example which uses wrong syntax. See updated node for fix. Instead of SUPER->pv it should be YourPackage->SUPER::pv. Here YourPackage is full qualified name of your subclassed package. Also you can use special token __PACKAGE__ instead of YourPackage. It will be substituted by Perl with this name.

BTW be careful with selection of package name. FYI CPAN already has Params::Validate. It is not same name but very close.

--
Ilya Martynov (http://martynov.org/)