Tie::RefHash - phpMan

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



NAME
       Tie::RefHash - use references as hash keys

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

           untie HASHVARIABLE;

DESCRIPTION
       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 preserved 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 convert-
       ing 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.

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";
           }

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

AUTHOR
       Gurusamy Sarathy        gsar AT activestate.com

       ’Nestable’ by Ed Avis   ed AT membled.com

VERSION
       Version 1.30

SEE ALSO
       perl(1), perlfunc(1), perltie(1)



perl v5.8.6                       2001-09-21                 Tie::RefHash(3pm)

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