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Tie::CPHash is a Perl module implementing a case preserving but case insensitive hash table.

From README: This module implements a least recently used (LRU) cache in memory through a tie interface. Any time data is stored in the tied hash, that key/value pair has an entry time associated with it, and as the cache fills up, those members of the cache that are the oldest are removed to make room for new entries. So, the cache only "remembers" the last written entries, up to the size of the cache. This can be especially useful if you access great amounts of data, but only access a minority of the data a majority of the time. The implementation is a hash, for quick lookups, overlaying a doubly linked list for quick insertion and deletion. On a WinNT PII 300, writes to the hash were done at a rate 3100 per second, and reads from the hash at 6300 per second. Work has been done to optimize refreshing cache entries that are frequently read from, code like $cache{entry}, which moves the entry to the end of the linked list internally.

Tie::Function simplifies wrapping functions in tied hash syntax so they can be interpolated in double-quoted literals without messy intermediate variables.

Tie::IxHash is a perl module implementing ordered in-memory associative arrays.

Perl module which implements an ordered hash-like object. It's a cross between a Perl hash and a linked list. Use it whenever you want the speed and structure of a Perl hash, but the orderedness of a list.

This modules causes any warnings produced by test scripts to be captured and stored. It automatically adds an extra test that will run when your script ends to check that there were no warnings. If there were any warnings, the test will give a "not ok" and diagnostics of where, when and what the warning was, including a stack trace of what was going on when the it occurred.

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 converting them to tied hashes so that they too can have references as keys. This will happen without warning whenever you store a refer- ence to one of your own hashes in the tied hash.

Creates a temporary instance of OpenLDAP's slapd daemon to run tests against.

Provides the opposite of the 'tied' function. Say you have %hash that is tied to $object. Then, it is relatively simple to get $object from %hash simply by saying $object = tied %hash; But, how does one go the other way? Simple, with Tie::Restore tie %hash, 'Tie::Restore', $object; Works for any kind of tie. (scalar, array, hash, filehandle)

Test::Output provides a simple interface for testing output sent to STDOUT or STDERR. A number of different utilities are included to try and be as flexible as possible to the tester. Originally this module was designed not to have external requirements, however, the features provided by Sub::Exporter over what Exporter provides is just to great to pass up. Test::Output ties STDOUT and STDERR using Test::Output::Tie.