package TrueFalse;

use overload (
  '+0' => \&num,
  '""' => \&num,
  bool => \&bool,
  fallback => 1,
);

require Exporter;
@ISA = qw( Exporter );
@EXPORT = qw( boolean true false );

use constant false => 0;
use constant true => 1;

sub new { bless [ @_[1,2] ], $_[0] }
sub bool { $_[0][1] }
sub num { $_[0][0] }
sub boolean { TrueFalse->new(@_) }

1;