ch16.012_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;

my %client_num_of;

sub new {
    my ($class, $arg_ref) = @_;

    croak 'Constructor called on existing object instead of class' 
        if ref $class;
 
    my $new_object = bless anon_scalar(), $class;  
 
    $client_num_of{ident $new_object} = $arg_ref->{client_num};
 
    return $new_object;
}