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1 # $Id: Boolean.pm,v 1.7 2000/07/03 08:54:47 matt Exp $ 2 3 package XML::XPath::Boolean; 4 use XML::XPath::Number; 5 use XML::XPath::Literal; 6 use strict; 7 8 use overload 9 '""' => \&value, 10 '<=>' => \&cmp; 11 12 sub True { 13 my $class = shift; 14 my $val = 1; 15 bless \$val, $class; 16 } 17 18 sub False { 19 my $class = shift; 20 my $val = 0; 21 bless \$val, $class; 22 } 23 24 sub value { 25 my $self = shift; 26 $$self; 27 } 28 29 sub cmp { 30 my $self = shift; 31 my ($other, $swap) = @_; 32 if ($swap) { 33 return $other <=> $$self; 34 } 35 return $$self <=> $other; 36 } 37 38 sub to_number { XML::XPath::Number->new($_[0]->value); } 39 sub to_boolean { $_[0]; } 40 sub to_literal { XML::XPath::Literal->new($_[0]->value ? "true" : "false"); } 41 42 sub string_value { return $_[0]->to_literal->value; } 43 44 1; 45 __END__ 46 47 =head1 NAME 48 49 XML::XPath::Boolean - Boolean true/false values 50 51 =head1 DESCRIPTION 52 53 XML::XPath::Boolean objects implement simple boolean true/false objects. 54 55 =head1 API 56 57 =head2 XML::XPath::Boolean->True 58 59 Creates a new Boolean object with a true value. 60 61 =head2 XML::XPath::Boolean->False 62 63 Creates a new Boolean object with a false value. 64 65 =head2 value() 66 67 Returns true or false. 68 69 =head2 to_literal() 70 71 Returns the string "true" or "false". 72 73 =cut
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