Tie::SubstrHash - phpMan

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



NAME
       Tie::SubstrHash - Fixed-table-size, fixed-key-length hashing

SYNOPSIS
           require Tie::SubstrHash;

           tie %myhash, ’Tie::SubstrHash’, $key_len, $value_len, $table_size;

DESCRIPTION
       The Tie::SubstrHash package provides a hash-table-like interface to an array of
       determinate size, with constant key size and record size.

       Upon tying a new hash to this package, the developer must specify the size of the
       keys that will be used, the size of the value fields that the keys will index, and
       the size of the overall table (in terms of key-value pairs, not size in hard mem-
       ory). These values will not change for the duration of the tied hash. The newly-
       allocated hash table may now have data stored and retrieved. Efforts to store more
       than $table_size elements will result in a fatal error, as will efforts to store a
       value not exactly $value_len characters in length, or reference through a key not
       exactly $key_len characters in length. While these constraints may seem excessive,
       the result is a hash table using much less internal memory than an equivalent
       freely-allocated hash table.

CAVEATS
       Because the current implementation uses the table and key sizes for the hashing
       algorithm, there is no means by which to dynamically change the value of any of the
       initialization parameters.

       The hash does not support exists().



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

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2008-12-02 05:03 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)