125 lines
1.9 KiB
Perl
125 lines
1.9 KiB
Perl
package Tie::RefHash;
|
|
|
|
=head1 NAME
|
|
|
|
Tie::RefHash - use references as hash keys
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
require 5.004;
|
|
use Tie::RefHash;
|
|
tie HASHVARIABLE, 'Tie::RefHash', LIST;
|
|
|
|
untie HASHVARIABLE;
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This module provides the ability to use references as hash keys if
|
|
you first C<tie> the hash variable to this module.
|
|
|
|
It is implemented using the standard perl TIEHASH interface. Please
|
|
see the C<tie> entry in perlfunc(1) and perltie(1) for more information.
|
|
|
|
=head1 EXAMPLE
|
|
|
|
use Tie::RefHash;
|
|
tie %h, 'Tie::RefHash';
|
|
$a = [];
|
|
$b = {};
|
|
$c = \*main;
|
|
$d = \"gunk";
|
|
$e = sub { 'foo' };
|
|
%h = ($a => 1, $b => 2, $c => 3, $d => 4, $e => 5);
|
|
$a->[0] = 'foo';
|
|
$b->{foo} = 'bar';
|
|
for (keys %h) {
|
|
print ref($_), "\n";
|
|
}
|
|
|
|
|
|
=head1 AUTHOR
|
|
|
|
Gurusamy Sarathy gsar@activestate.com
|
|
|
|
=head1 VERSION
|
|
|
|
Version 1.21 22 Jun 1999
|
|
|
|
=head1 SEE ALSO
|
|
|
|
perl(1), perlfunc(1), perltie(1)
|
|
|
|
=cut
|
|
|
|
require 5.003_11;
|
|
use Tie::Hash;
|
|
@ISA = qw(Tie::Hash);
|
|
use strict;
|
|
|
|
sub TIEHASH {
|
|
my $c = shift;
|
|
my $s = [];
|
|
bless $s, $c;
|
|
while (@_) {
|
|
$s->STORE(shift, shift);
|
|
}
|
|
return $s;
|
|
}
|
|
|
|
sub FETCH {
|
|
my($s, $k) = @_;
|
|
(ref $k) ? $s->[0]{"$k"}[1] : $s->[1]{$k};
|
|
}
|
|
|
|
sub STORE {
|
|
my($s, $k, $v) = @_;
|
|
if (ref $k) {
|
|
$s->[0]{"$k"} = [$k, $v];
|
|
}
|
|
else {
|
|
$s->[1]{$k} = $v;
|
|
}
|
|
$v;
|
|
}
|
|
|
|
sub DELETE {
|
|
my($s, $k) = @_;
|
|
(ref $k) ? delete($s->[0]{"$k"}) : delete($s->[1]{$k});
|
|
}
|
|
|
|
sub EXISTS {
|
|
my($s, $k) = @_;
|
|
(ref $k) ? exists($s->[0]{"$k"}) : exists($s->[1]{$k});
|
|
}
|
|
|
|
sub FIRSTKEY {
|
|
my $s = shift;
|
|
keys %{$s->[0]}; # reset iterator
|
|
keys %{$s->[1]}; # reset iterator
|
|
$s->[2] = 0;
|
|
$s->NEXTKEY;
|
|
}
|
|
|
|
sub NEXTKEY {
|
|
my $s = shift;
|
|
my ($k, $v);
|
|
if (!$s->[2]) {
|
|
if (($k, $v) = each %{$s->[0]}) {
|
|
return $s->[0]{"$k"}[0];
|
|
}
|
|
else {
|
|
$s->[2] = 1;
|
|
}
|
|
}
|
|
return each %{$s->[1]};
|
|
}
|
|
|
|
sub CLEAR {
|
|
my $s = shift;
|
|
$s->[2] = 0;
|
|
%{$s->[0]} = ();
|
|
%{$s->[1]} = ();
|
|
}
|
|
|
|
1;
|