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# $Id: Boolean.pm,v 1.7 2000/07/03 08:54:47 matt Exp $
package XML::XPath::Boolean;
use XML::XPath::Number;
use XML::XPath::Literal;
use strict;
use overload
'""' => \&value,
'<=>' => \&cmp;
sub True {
my $class = shift;
my $val = 1;
bless \$val, $class;
}
sub False {
my $class = shift;
my $val = 0;
bless \$val, $class;
}
sub value {
my $self = shift;
$$self;
}
sub cmp {
my $self = shift;
my ($other, $swap) = @_;
if ($swap) {
return $other <=> $$self;
}
return $$self <=> $other;
}
sub to_number { XML::XPath::Number->new($_[0]->value); }
sub to_boolean { $_[0]; }
sub to_literal { XML::XPath::Literal->new($_[0]->value ? "true" : "false"); }
sub string_value { return $_[0]->to_literal->value; }
1;
__END__
=head1 NAME
XML::XPath::Boolean - Boolean true/false values
=head1 DESCRIPTION
XML::XPath::Boolean objects implement simple boolean true/false objects.
=head1 API
=head2 XML::XPath::Boolean->True
Creates a new Boolean object with a true value.
=head2 XML::XPath::Boolean->False
Creates a new Boolean object with a false value.
=head2 value()
Returns true or false.
=head2 to_literal()
Returns the string "true" or "false".
=cut
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