++ed by:

38 PAUSE user(s)
22 non-PAUSE user(s).

Jeffrey Ryan Thalhammer


Perl::Critic::Policy::Subroutines::ProhibitUnusedPrivateSubroutines - Prevent unused private subroutines.


This Policy is part of the core Perl::Critic distribution.


By convention Perl authors (like authors in many other languages) indicate private methods and variables by inserting a leading underscore before the identifier. This policy catches such subroutines which are not used in the file which declares them.

This module defines a 'use' of a subroutine as a subroutine or method call to it (other than from inside the subroutine itself), a reference to it (i.e. my $foo = \&_foo), a goto to it outside the subroutine itself (i.e. goto &_foo), or the use of the subroutine's name as an even-numbered argument to use overload.


You can define what a private subroutine name looks like by specifying a regular expression for the private_name_regex option in your .perlcriticrc:

    private_name_regex = _(?!_)\w+

The above example is a way of saying that subroutines that start with a double underscore are not considered to be private. (Perl::Critic, in its implementation, uses leading double underscores to indicate a distribution-private subroutine -- one that is allowed to be invoked by other Perl::Critic modules, but not by anything outside of Perl::Critic.)

You can configure additional subroutines to accept by specifying them in a space-delimited list to the allow option:

    allow = _bar _baz

These are added to the default list of exemptions from this policy. So the above allows sub _bar {} and sub _baz {}, even if they are not referred to in the module that defines them.


This policy is derived from Perl::Critic::Policy::Subroutines::ProtectPrivateSubs, which looks at the other side of the problem.


Does not forbid sub Foo::_foo{} because it does not know (and can not assume) what is in the Foo package.




Chris Dolan <cdolan@cpan.org>


Copyright (c) 2009-2011 Thomas R. Wyant, III.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module.

Hosting generously
sponsored by Bytemark