ch16.055_prob

Perl Best Practices the source code

##############################################################################
## Code fragment (NOT RECOMMENDED) from Chapter 16 of "Perl Best Practices" ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;


package Phonebook;
use Class::Std;
use Carp;
{
    my %entries_of : ATTR;
 
    # Any method call is someone's name: store their phone number or get it...
    sub AUTOLOAD {
        my ($self, $number) = @_;
 
        # Extract get/set mode and person's name from method name...
        our $AUTOLOAD;
        my ($mode, $name) = $AUTOLOAD =~ m/.* :: ([gs]et)_(.*)/xms
            or croak "Can't call $AUTOLOAD on object";
 
        # Update if it's a set_<name> operation...
        if ($mode eq 'set') {
            croak "Missing argument for set_$name" if @_ == 1;
            $entries_of{ident $self}->{$name} = $number;
        }
 
        return $entries_of{ident $self}->{$name};
    }
}
 
# and later...
 
my $lbb = Phonebook->new();
 
$lbb->set_Jenny(867_5309);
$lbb->set_Glenn(736_5000);
 
print $lbb->get_Jenny(), "\n";
print $lbb->get_Glenn(), "\n";

$lbb->call_Jenny();