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Tie::RefHash(3pm)		 Perl Programmers Reference Guide		Tie::RefHash(3pm)

       Tie::RefHash - use references as hash keys

	   require 5.004;
	   use Tie::RefHash;
	   tie HASHVARIABLE, 'Tie::RefHash', LIST;
	   tie HASHVARIABLE, 'Tie::RefHash::Nestable', LIST;


       This module provides the ability to use references as hash keys if you first "tie" the
       hash variable to this module.  Normally, only the keys of the tied hash itself are pre-
       served as references; to use references as keys in hashes-of-hashes, use
       Tie::RefHash::Nestable, included as part of Tie::RefHash.

       It is implemented using the standard perl TIEHASH interface.  Please see the "tie" entry
       in perlfunc(1) and perltie(1) for more information.

       The Nestable version works by looking for hash references being stored and converting them
       to tied hashes so that they too can have references as keys.  This will happen without
       warning whenever you store a reference to one of your own hashes in the tied hash.

	   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";

	   tie %h, 'Tie::RefHash::Nestable';
	   $h{$a}->{$b} = 1;
	   for (keys %h, keys %{$h{$a}}) {
	      print ref($_), "\n";

       Gurusamy Sarathy        gsar@activestate.com

       Version 1.30

       perl(1), perlfunc(1), perltie(1)

perl v5.8.0				    2002-06-01				Tie::RefHash(3pm)
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