And here is an "inside-out" version of the same. The attributes have their own hashes that are not exposed to the outside world, so the nasty users can only access them by calling a method. The "object" that they see is the address of a 'my' variable, which is useless to them.
#class Address using inside-out objects
package Address;
use Scalar::Util qw(refaddr);
use strict;
use warnings;

my %street;
my %city;
my %state;
my %zip;

#constructor
sub new {
    my ($class, $street, $city, $state, $zip) = @_;
    
    # Get any old (unique) reference
    my $self = bless \do{my $gash}, $class;
    my $key = refaddr $self;   # Extract the address 
    
    $street{$key} = $street;
    $city  {$key} = $city;
    $state {$key} = $state;
    $zip   {$key} = $zip;
    
    return $self;
}

sub street {
    my ( $self, $street ) = @_;
    my $key = refaddr $self;
    
    $street{$key} = $street if defined($street);
    return $street{$key};
}

sub city {
    my ( $self, $city ) = @_;
    my $key = refaddr $self;
    
    $city{$key} = $city if defined($city);
    return $city{$key};
}

sub state {
    my ( $self, $state ) = @_;
    my $key = refaddr $self;
    
    $state{$key} = $state if defined($state);
    return $state{$key};
}

sub zip {
    my ( $self, $zip ) = @_;
    my $key = refaddr $self;
    
    $zip{$key} = $zip if defined($zip);
    return $zip{$key};
}

sub print {
    my ($self) = @_;
    my $key = refaddr $self;

    print "Address: $street{$key}\n".
                   "$city{$key}\n"  .
                   "$state{$key}\n" .
                   "$zip{$key}\n\n" ;
}

1;

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In reply to Re^2: object oriented tutorial question by cdarke
in thread object oriented tutorial question by convenientstore

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