package Base;

use Carp;

my @methods = qw(new something something_else);
my %methods;
@method{@methods} = ();

sub AUTOLOAD {
  my ($pkg, $method) = $AUTOLOAD =~ /^(.*)::(.*)$/;

  if (exists $method{$method}) {
    croak qq(Package "$pkg" must override the method "$method");
  }
}

1;

##</code><code>##

#!/usr/bin/perl -w

use strict;

package MyObj;

use vars qw(@ISA);
use Base;

@ISA = qw(Base);

sub new {
  return bless {}, shift;
}

package main;

my $thing = MyObj->new;

$thing->something;