FloydATC has asked for the wisdom of the Perl Monks concerning the following question:

I'm creating a private class structure under Foo, named Foo::Bar.
package Foo::Bar; use Carp; our @ISA = (); 1; sub new { my ($class, %opt) = @_; my $self = {}; bless ($self, $class); $self->init(%opt); return $self; }
From here, I want to inherit the constructor and some other stuff in subclass like so:
package Foo::Bar::Baz; use strict; use warnings; use Carp; our @ISA = qw( Foo::Bar ); 1; sub init { my $self = shift; my %opt = @_; # do the actual init for this specific class }
Why then, does my test script not work??
#!/usr/bin/perl use strict; use warnings; use Foo::Bar::Baz; my $item = Foo::Bar::Baz->new();
but instead yield an error: Can't locate object method "new" via package "Foo::Bar::Baz" at ./huh line 107. It's like the @ISA doesn't exist, what's going on?? I must have done this a million times but for some reason it doesn't on this machine... This is perl 5.8.8 on a Gentoo Linux and I'm ashamed to say this simple thing has had me stuck for over an hour now :-|

-- Time flies when you don't know what you're doing

Replies are listed 'Best First'.
Re: Inheritance doesn't
by gmargo (Hermit) on Oct 16, 2009 at 12:27 UTC

    You need a

    use Foo::Bar;
    line in your Foo::Bar::Baz package.

      or
      use base Foo::Bar
      which basically is 'use' and '@ISA' in one go
        or
        use parent 'Foo::Bar';
        (parent is a new in the base at 5.10.1)
      *smacks head* Thanks.

      -- Time flies when you don't know what you're doing