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.