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CentOS 7.0 - man page for perl::critic::policy::variables::requirelocalizedpunctuationvars (centos section 3)


       Perl::Critic::Policy::Variables::RequireLocalizedPunctuationVars - Magic variables should
       be assigned as "local".

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

       Punctuation variables (and their English.pm equivalents) are global variables.  Messing
       with globals is dangerous in a complex program as it can lead to very subtle and hard to
       fix bugs.  If you must change a magic variable in a non-trivial program, do it in a local

       For example, to slurp a filehandle into a scalar, it's common to set the record separator
       to undef instead of a newline.  If you choose to do this (instead of using File::Slurp!)
       then be sure to localize the global and change it for as short a time as possible.

	   # BAD:
	   $/ = undef;
	   my $content = <$fh>;

	   # BETTER:
	   my $content;
	       local $/ = undef;
	       $content = <$fh>;

	   # A popular idiom:
	   my $content = do { local $/ = undef; <$fh> };

       This policy also allows the use of "my".  Perl prevents using "my" with "proper"
       punctuation variables, but allows $a, @ARGV, the names declared by English, etc.  This is
       not a good coding practice, however it is not the concern of this specific policy to
       complain about that.

       There are exemptions for $_ and @_, and the English equivalent $ARG.

       You can configure your own exemptions using the "allow" option:

	   allow = @ARGV $ARGV

       These are added to the default exemptions.

       Initial development of this policy was supported by a grant from the Perl Foundation.

       Chris Dolan <cdolan@cpan.org>

       Copyright (c) 2007-2011 Chris Dolan.  Many 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 v5.16.3		      Perl::Critic::Policy::Variables::RequireLocalizedPunctuationVars(3)

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