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DOWENS / JSON-DWIW-0.47 / lib / JSON / DWIW / Boolean.pm 

            

              
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# Creation date: 2007-05-10 20:29:02
# Authors: don
#
# Copyright (c) 2007-2010 Don Owens <don@regexguy.com>.  All rights reserved.
#
# This is free software; you can redistribute it and/or modify it under
# the Perl Artistic license.  You should have received a copy of the
# Artistic license with this distribution, in the file named
# "Artistic".  You may also obtain a copy from
# http://regexguy.com/license/Artistic
#
# This program 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.
=pod
=head1 NAME
JSON::DWIW::Boolean - Return a true or false value when evaluated
in boolean context -- to be used with JSON::DWIW->encode() to
explicitly specify a boolean value.`
=head1 SYNOPSIS
 use JSON::DWIW;
 my $val1 = JSON::DWIW->true;
 my $val2 = JSON::DWIW->false;
  
 # or
  
 use JSON::DWIW::Boolean;
 my $val1 = JSON::DWIW::Boolean->new(1); # true value
 my $val2 = JSON::DWIW::Boolean->new(0); # false value
=head1 DESCRIPTION
This module is not intended to be used directly.  It is intended
to be used as part of L<JSON::DWIW> to specify that a true or false
value should be output when converting to JSON, since Perl does
not have explicit values for true and false.
Overloading is used, so if a L<JSON::DWIW::Boolean> object is
evaluated in boolean context, it will evaluate to 1 or 0,
depending on whether the object was initialized to true or false.
=cut
use strict;
use warnings;
use 5.006_00;
package JSON::DWIW::Boolean;
use overload
    bool => sub { my $self = shift; my $val = $$self; return $val ? 1 : 0; },
    '0+' => sub { my $self = shift; my $val = $$self; return $val ? 1 : 0; };
     
our $VERSION = sprintf("%d.%02d",(q$Revision: 1.4 $ =~ /\d+/g));
=pod
=head1 METHODS
=head2 C<new($val)>
Returns an object initialized with $val as its boolean value.
=cut
sub new {
    my $proto = shift;
    my $val = shift;
    my $obj = $val;
     
    my $self = bless \$obj, ref($proto) || $proto;
     
    return $self;
}
=pod
=head2 C<true()>
Class method that returns a new object initialized to a true value.
=cut
sub true {
    my $proto = shift;
    return $proto->new(1);
}
=pod
=head2 C<false()>
Class method that returns a new object initialized to a false value.
=cut
sub false {
    my $proto = shift;
    return $proto->new(0);
}
sub as_bool {
    my $self = shift;
    my $val = $$self;
    if ($val) {
        return 1;
    }
    return;
}
=pod
=head1 AUTHOR
Don Owens <don@regexguy.com>
=head1 LICENSE AND COPYRIGHT
Copyright (c) 2007-2010 Don Owens <don@regexguy.com>.  All rights reserved.
This is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.  See perlartistic.
This program 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.
=cut
1;
# Local Variables: #
# mode: perl #
# tab-width: 4 #
# indent-tabs-mode: nil #
# cperl-indent-level: 4 #
# perl-indent-level: 4 #
# End: #
# vim:set ai si et sta ts=4 sw=4 sts=4: