ch16.056_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (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 Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;


package Phonebook;
use Class::Std;
use Carp;
{
    my %entries_of : ATTR;
 
    # Set numbers...
    sub set_number_of {
        croak 'Missing argument for set_number_of()' if @_ < 3;
 
        my ($self, $name, $number) = @_;
 
        $entries_of{ident $self}->{$name} = $number;
 
        return;
    }
 
    # Get numbers...
    sub get_number_of {
        croak 'Missing argument for get_number_of()' if @_ < 2;
 
        my ($self, $name) = @_;
 
        return $entries_of{ident $self}->{$name};
    }
}
 
# and later...
 
my $lbb = Phonebook->new();
 
$lbb->set_number_of(Jenny => 867_5309);
$lbb->set_number_of(Glenn => 736_5000);
 
print $lbb->get_number_of('Jenny'), "\n";
print $lbb->get_number_of('Glenn'), "\n";

$lbb->call_Jenny();