# Copyright (c) 1999-2011 bivio Software, Inc.  All rights reserved.
#
# Visit http://www.bivio.biz for more info.
# 
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
# 
# This library is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this library;  If not, you may get a copy from:
# http://www.opensource.org/licenses/lgpl-license.html
# 
# $Id: Percent.pm,v 2.2 2011/06/06 20:45:49 moeller Exp $
package Bivio::Type::Percent;
use strict;
use Bivio::Base 'Type.Amount';

our($VERSION) = sprintf('%d.%02d', q$Revision: 2.2 $ =~ /\d+/g);

sub calculate {
    # (proto, string, string) : string
    # Returns 100 * amount / total.
    # Returns 0 if total is 0.
    my($proto, $amount, $total) = @_;
    return $total == 0
	? 0
	: $proto->div($proto->mul($amount, 100), $total);
}

1;