Perl::Critic::Policy::Variables::RequireInitializationForLocalVars(3)
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
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 v5.2Perl::Critic::Policy::Variables::RequireInitializationForLocalVars(3)
perl-critic 1.134.0 - Generated Thu Jun 6 14:16:03 CDT 2019