Sometimes you need to test what happens when a given module is not installed. This module provides a way of temporarily hiding installed modules from perl's require mechanism. The Module::Mask object adds itself to @INC and blocks require calls to restricted modules.

This module handles parsing, modifying and creating configuration files of the style used by the Git version control system.

Bit::Vector is an efficient C library which allows you to handle bit vectors, sets (of integers), "big integer arithmetic" and boolean matrices, all of arbitrary sizes. The package also includes an object-oriented Perl module for accessing the C library from Perl, and optionally features overloaded operators for maximum ease of use. The C library can nevertheless be used stand-alone, without Perl.

This policy checks for perlsecret operators in your code and warns you about them. You can override the secrets that are allowed or disallowed using the parameters allow_secrets and disallow_secrets. The default is to simply disallow everything.

The Cache modules are designed to assist a developer in persisting data for a specified period of time. Often these modules are used in web applications to store data locally to save repeated and redundant expensive calls to remote machines or databases. People have also been known to use Cache::Cache for its straightforward interface in sharing data between runs of an application or invocations of a CGI-style script or simply as an easy to use abstraction of the file system or shared memory.

The inc::latest module helps bootstrap configure-time dependencies for CPAN distributions. These dependencies get bundled into the inc directory within a distribution and are used by Makefile.PL or Build.PL.

This package consists of a Perl module for date calculations based on the Gregorian calendar, thereby complying with all relevant norms and standards: ISO/R 2015-1971, DIN 1355 and, to some extent, ISO 8601 (where applicable).

Sub::Quote provides an efficient generation of subroutines via string eval.

The form() subroutine may be exported from the module. It takes a series of format (or "picture") strings followed by replacement values, interpolates those values into each picture string, and returns the result. The effect is similar to the inbuilt perl format mechanism, although the field specification syntax is simpler and some of the formatting behaviour is more sophisticated.

This package is a companion module to DateTime.pm. It implements the Julian calendar. It supports everything that DateTime.pm supports and more: about one day per century more, to be precise.

Routines to manipulate defhash, a convention to define things more precisely and uniformly using a hash, in Perl.

This is a minimalist Perl module for building simple classes with read-only accessors.

This module adds the ability to quickly create new types of tie objects without creating a complete class. It does so in such a way as to try and make the programmers life easier when it comes to single-use ties that I find myself wanting to use from time-to-time.

The Tie::Simple package is actually a front-end to other classes which really do all the work once tied, but this package does the dwimming to automatically figure out what you're trying to do.

Module::ScanDeps is a module to recursively scan Perl programs for dependencies.

Assigns a new name to referenced sub. If package specification is omitted in the name, then the current package is used. The return value is the sub.

The Carp routines are useful in your own modules because they act like die() or warn(), but with a message which is more likely to be useful to a user of your module. In the case of cluck, confess, and longmess that context is a summary of every call in the call-stack. For a shorter message you can use carp or croak which report the error as being from where your module was called. There is no guarantee that that is where the error was, but it is a good educated guess.

Scalar::String is about the string part of plain Perl scalars. A scalar has a string value, which is notionally a sequence of Unicode codepoints but may be internally encoded in either ISO-8859-1 or UTF-8. In places, more so in older versions of Perl, the internal encoding shows through. To fully understand Perl strings it is necessary to understand these implementation details. This module provides functions to classify a string by encoding and to encode a string in a desired way. The module is implemented in XS, with a pure Perl backup version for systems that cannot handle XS.

This module understands the formats used by PostgreSQL for its DATE, TIME, TIMESTAMP, and INTERVAL data types. It can be used to parse these formats in order to create DateTime or DateTime::Duration objects, and it can take a DateTime or DateTime::Duration object and produce a string representing it in a format accepted by PostgreSQL.

The Digest::JHash module allows you to use the fast JHash hashing algorithm developed by Bob Jenkins from within Perl programs. The algorithm takes as input a message of arbitrary length and produces as output a 32-bit "message digest" of the input in the form of an unsigned long integer.

The Digest::CRC module calculates CRC sums of all sorts. It contains wrapper functions with the correct parameters for CRC-CCITT, CRC-16 and CRC-32.

Data::SExpression parses Lisp S-Expressions into Perl data structures.

MooX::HandlesVia is an extension of Moo's handles attribute functionality. It provides a means of proxying functionality from an external class to the given attribute.

This package allows you to analyze tests from the command line using Test::Run.

Similar to List::MoreUtils, Hash::MoreUtils contains trivial but commonly-used functionality for hashes. The primary focus for the moment is providing a common API - speeding up by XS is far away at the moment.