perl::critic::policy::variables::protectprivatevars(3pm) [debian man page]

Perl::Critic::Policy::Variables::ProtectPrivateVars(3pm)User Contributed Perl DocumentatioPerl::Critic::Policy::Variables::ProtectPrivateVars(3pm)

NAME

       Perl::Critic::Policy::Variables::ProtectPrivateVars - Prevent access to private vars in other packages.

AFFILIATION

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

DESCRIPTION

       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 attempts to access private variables from outside the package itself.

CONFIGURATION

       This Policy is not configurable except for the standard options.

HISTORY

       This policy is inspired by a similar test in B::Lint

SEE ALSO

       Perl::Critic::Policy::Subroutines::ProtectPrivateSubs

AUTHOR

       Chris Dolan <cdolan@cpan.org>

COPYRIGHT

       Copyright (c) 2006-2011 Chris Dolan.

       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.

perl v5.14.2							    2012-06-07		  Perl::Critic::Policy::Variables::ProtectPrivateVars(3pm)

Perl::Critic::Policy::Variables::RequireNegativeIndices(User Contributed Perl DocumentPerl::Critic::Policy::Variables::RequireNegativeIndices(3pm)

NAME

       Perl::Critic::Policy::Variables::RequireNegativeIndices - Negative array index should be used.

AFFILIATION

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

DESCRIPTION

       Conway points out that

	   $arr[$#arr];
	   $arr[$#arr-1];
	   $arr[@arr-1];
	   $arr[@arr-2];

       are equivalent to

	   $arr[-1];
	   $arr[-2];
	   $arr[-1];
	   $arr[-2];

       and the latter are more readable, performant and maintainable.  The latter is because the programmer no longer needs to keep two variable
       names matched.

       This policy notices all of the simple forms of the above problem, but does not recognize any of these more complex examples:

	   $some->[$data_structure]->[$#{$some->[$data_structure]} -1];
	   my $ref = @arr;
	   $ref->[$#arr];

CONFIGURATION

       This Policy is not configurable except for the standard options.

AUTHOR

       Chris Dolan <cdolan@cpan.org>

COPYRIGHT

       Copyright (c) 2006-2011 Chris Dolan.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-06-07	      Perl::Critic::Policy::Variables::RequireNegativeIndices(3pm)