xenial (3) Perl::Critic::Policy::Variables::RequireInitializationForLocalVars.3pm.gz

Provided by: libperl-critic-perl_1.126-1_all bug

NAME
       Perl::Critic::Policy::Variables::RequireInitializationForLocalVars - Write "local $foo = $bar;" instead
       of just "local $foo;".


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


DESCRIPTION
       Most people don't realize that a localized copy of a variable does not retain its original value.  Unless
       you initialize the variable when you "local"-ize it, it defaults to "undef".  If you want the variable to
       retain its original value, just initialize it to itself.  If you really do want the localized copy to be
       undef, then make it explicit.

           package Foo;
           $Bar = '42';

           package Baz;

           sub frobulate {

               local $Foo::Bar;              #not ok, local $Foo::Bar is 'undef'
               local $Foo::Bar = undef;      #ok, local $Foo::Bar is obviously 'undef'
               local $Foo::Bar = $Foo::Bar;  #ok, local $Foo::Bar still equals '42'

           }


CONFIGURATION
       This Policy is not configurable except for the standard options.


AUTHOR
       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>


       Copyright (c) 2005-2011 Imaginative Software Systems.  All rights reserved.

       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 v5.20.2                             Perl::Critic::Policy::Variables::RequireInitializationForLocalVars(3pm)