Programming Perl, 3rd Edition

Tie Modules on CPAN

Before you get all inspired to write your own tie module, you should check to see if someone's already done it. There are lots of tie modules on CPAN, with more every day. (Well, every month, anyway.) Table 14.1 lists some of them.

Table 14-1. Tie Modules on CPAN

Module	Description
GnuPG::Tie::Encrypt	Ties a filehandle interface to encryption with the GNU Privacy Guard.
IO::WrapTie	Wraps tied objects in an IO::Handle interface.
MLDBM	Transparently stores complex data values, not just flat strings, in a DBM file.
Net::NISplusTied	Ties hashes to NIS+ tables.
Tie::Cache::LRU	Implements a least-recently used cache.
Tie::Const	Provides constant scalars and hashes.
Tie::Counter	Enchants a scalar variable to increment upon each access.
Tie::CPHash	Implements a case-preserving but case-insensitive hash.
Tie::DB_FileLock	Provides locking access to Berkeley DB 1.x.
Tie::DBI	Ties hashes to DBI relational databases.
Tie::DB_Lock	Ties hashes to databases using shared and exclusive locks.
Tie::Dict	Ties a hash to an RPC dict server.
Tie::Dir	Ties a hash for reading directories.
Tie::DirHandle	Ties directory handles.
Tie::FileLRUCache	Implements a lightweight, filesystem-based, persistent LRU cache.
Tie::FlipFlop	Implements a tie that alternates between two values.
Tie::HashDefaults	Lets a hash have default values.
Tie::HashHistory	Tracks history of all changes to a hash.
Tie::IxHash	Provides ordered associative arrays for Perl.
Tie::LDAP	Implements an interface to an LDAP database.
Tie::Persistent	Provides persistent ...