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use base Vehicle; @ISA = 'Vehicle';

Pick one or the other, not both. I prefer base.

croak "$option is not valid" if ! $self->_valid( $option );

Use unless.

my %valid = map { $_ => 1 } qw( Wheels Doors Color Passengers ); my %ro = map { $_ => 1 } qw( Wheels ); sub _read_only { my ($self, $option) = @_; return defined $ro{$option} ? 1 : 0; }

If you elided the lexicals in favor of class methods, you wouldn't have to repeat this code in both subclasses:

sub _attributes { return { map { $_ => 1 } qw( Wheels Doors Color Passengers ) }; } sub _valid { my ($self, $attribute) = @_; return exists $self->_attributes()->{ $attribute }; }

Finally, aside from inheriting a constructor and an AUTOLOAD, I don't see any reason why you need to inherit here. You'd probably be better off using a module that autogenerated your accessors. It's not wrong, but I don't see any real benefits to this approach.

I did it this way when I was first learning, though. It won't cause you any real trouble; it's just a bit more complication that doesn't add very much. ~shrug~


In reply to Re: OO Inheritence by chromatic
in thread OO Inheritence by Limbic~Region

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