Programming Perl, 4th Edition

Tie Modules on CPAN

Before you get all inspired to write your own tie module, you should check to see whether someone’s already done it. There are lots of tie modules on CPAN, with more every day. (Well, every month, anyway.) Table 14-2 lists some of them.

Table 14-2. Tie modules on CPAN

Module	Description
IO::WrapTie	Wraps tied objects in an IO::Handle interface.
MLDBM	Transparently stores complex data values, not just flat strings, in a DBM file.
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::Cycle	Cycles through a list of values via a scalar.
Tie::DBI	Ties hashes to DBI relational databases.
Tie::Dict	Ties a hash to an RPC dict server.
Tie::DictFile	Ties a hash to a local dictionary file.
Tie::DNS	Ties interface to Net::DNS.
Tie::EncryptedHash	Hashes (and objects based on hashes) with encrypting fields.
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::iCal	Ties iCal files to Perl hashes.
Tie::IxHash	Provides ordered associative arrays for Perl.
Tie::LDAP	Implements an interface to an LDAP database.
Tie::Persistent	Provides persistent data structures via tie.
Tie::Pick	Randomly picks (and removes) ...