1Perl::Critic::Policy::VUasPreeirralbC:lo:enCstr:ri:itPbirucot:he:idPboiPlteiPrcalyc:kD:aoVgcaeurVmiaearnbstl(ae3ts)i:o:nProhibitPackageVars(3)
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NAME

6       Perl::Critic::Policy::Variables::ProhibitPackageVars - Eliminate
7       globals declared with "our" or "use vars".
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AFFILIATION

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

13       Conway suggests avoiding package variables completely, because they
14       expose your internals to other packages.  Never use a package variable
15       when a lexical variable will suffice.  If your package needs to keep
16       some dynamic state, consider using an object or closures to keep the
17       state private.
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19       This policy assumes that you're using "strict vars" so that naked
20       variable declarations are not package variables by default.  Thus, it
21       complains you declare a variable with "our" or "use vars", or if you
22       make reference to variable with a fully-qualified package name.
23
24           $Some::Package::foo = 1;    # not ok
25           our $foo            = 1;    # not ok
26           use vars '$foo';            # not ok
27           $foo = 1;                   # not allowed by 'strict'
28           local $foo = 1;             # bad taste, but technically ok.
29           use vars '$FOO';            # ok, because it's ALL CAPS
30           my $foo = 1;                # ok
31
32       In practice though, its not really practical to prohibit all package
33       variables.  Common variables like $VERSION and @EXPORT need to be
34       global, as do any variables that you want to Export.  To work around
35       this, the Policy overlooks any variables that are in ALL_CAPS.  This
36       forces you to put all your exported variables in ALL_CAPS too, which
37       seems to be the usual practice anyway.
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CONFIGURATION

40       There is room for exceptions.  Some modules, like the core File::Find
41       module, use package variables as their only interface, and others like
42       Data::Dumper use package variables as their most common interface.
43       These module can be specified from your .perlcriticrc file, and the
44       policy will ignore them.
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46           [Variables::ProhibitPackageVars]
47           packages = Data::Dumper File::Find FindBin Log::Log4perl
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49       This is the default setting.  Using "packages ="  will override these
50       defaults.
51
52       You can also add packages to the defaults like so:
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54           [Variables::ProhibitPackageVars]
55           add_packages = My::Package
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57       You can add package "main" to the list of packages, but that will only
58       OK variables explicitly in the "main" package.
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SEE ALSO

61       Perl::Critic::Policy::Variables::ProhibitPunctuationVars
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63       Perl::Critic::Policy::Variables::ProhibitLocalVars
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AUTHOR

66       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
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69       Copyright (c) 2005-2011 Imaginative Software Systems.  All rights
70       reserved.
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72       This program is free software; you can redistribute it and/or modify it
73       under the same terms as Perl itself.  The full text of this license can
74       be found in the LICENSE file included with this module.
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78perl v5.32.1           Perl::Criti2c0:2:1P-o0l3i-c2y4::Variables::ProhibitPackageVars(3)
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