ch13.023_best

来自「Perl Best Practices the source code」· 023_BEST 代码 · 共 27 行

##############################################################################
##   Code fragment (Recommended) from Chapter 13 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 ($min, $max) = (0..9);
my $val = 10000;

use Carp;
 
# and later...
 
croak( "Value $val is out of range ($min..$max)" )
    if $val < $min || $val > $max;