redhat man page for tie::refhash

Query: tie::refhash

OS: redhat

Section: 3pm

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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 informa- tion. The Nestable version works by looking for hash references being stored and converting them to tied hashes so that they too can have refer- ences 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'; $b->{foo} = 'bar'; for (keys %h) { print ref($_), " "; } tie %h, 'Tie::RefHash::Nestable'; $h{$a}->{$b} = 1; for (keys %h, keys %{$h{$a}}) { print ref($_), " "; }
AUTHOR
Gurusamy Sarathy gsar@activestate.com
VERSION
Version 1.30
SEE ALSO
perl(1), perlfunc(1), perltie(1) perl v5.8.0 2002-06-01 Tie::RefHash(3pm)
Related Man Pages
tie::hash::namedcapture(3pm) - osx
tie::hash::namedcapture(3pm) - centos
tie::refhash(3pm) - centos
hash::util::fieldhash::compat(3pm) - debian
tie::hash::namedcapture(3perl) - debian
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