NAME

       Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements - Avoid putting
       conditional logic around compile-time includes.

AFFILIATION

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

DESCRIPTION

       Modules included via "use" are loaded at compile-time.  Placing conditional logic around
       the "use" statement has no effect on whether the module will be loaded.  Doing so can also
       serve to confuse the reader as to the author's original intent.

       If you need to conditionally load a module you should be using "require" instead.

       This policy will catch the following forms of conditional "use" statements:

           # if-elsif-else
           if ($a == 1) { use Module; }
           if ($a == 1) { } elsif ($a == 2) { use Module; }
           if ($a == 1) { } else { use Module; }

           # for/foreach
           for (1..$a) { use Module; }
           foreach (@a) { use Module; }

           # while
           while ($a == 1) { use Module; }

           # unless
           unless ($a == 1) { use Module; }

           # until
           until ($a == 1) { use Module; }

           # do-condition
           do { use Module; } if $a == 1;
           do { use Module; } while $a == 1;
           do { use Module; } unless $a == 1;
           do { use Module; } until $a == 1;

           # operator-do
           $a == 1 || do { use Module; };
           $a == 1 && do { use Module; };
           $a == 1 or do { use Module; };
           $a == 1 and do { use Module; };

           # non-string eval
           eval { use Module; };

       Including a module via "use" in bare blocks, standalone do blocks, or string evals is
       allowed.

           # bare block
           { use Module; }

           # do
           do { use Module; }

           # string eval
           eval "use Module";

CONFIGURATION

       This Policy is not configurable except for the standard options.

AUTHOR

       Peter Guzis <pguzis@cpan.org>

COPYRIGHT

       Copyright (c) 2010-2011 Peter Guzis.  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 v5.18.1                 Perl::Critic::Policy::Modules::ProhibitConditionalUseStatements(3pm)