NAME

       Perl::Critic::Policy::InputOutput::ProhibitBarewordDirHandles - Write "opendir my $dh,
       $dirname;" instead of "opendir DH, $dirname;".

AFFILIATION

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

DESCRIPTION

       Using bareword symbols to refer to directory handles is particularly evil because they are
       global, and you have no idea if that symbol already points to some other file or directory
       handle.  You can mitigate some of that risk by "local"izing the symbol first, but that's
       pretty ugly.  Since Perl 5.6, you can use an undefined scalar variable as a lexical
       reference to an anonymous file handle or directory handle.  Alternatively, see the
       IO::Handle or IO::Dir modules for an object-oriented approach.

           opendir DH, $some_dir;            #not ok
           opendir *DH, $some_dir;           #not ok
           opendir \*DH, $some_dir;          #not ok
           opendir local *DH, $some_dir;     #not ok
           opendir $dh, $some_dir;           #ok
           opendir my $dh, $some_dir;        #ok
           opendir our $dh, $some_dir;       #ok
           opendir local $dh, $some_dir;     #ok
           my $dh = IO::Dir->new($some_dir); #ok

       And Perl7 will probably drop support for bareword filehandles.

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles::Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles

       IO::Handle

       IO::Dir

AUTHOR

       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>, "github.com/pali",
       "github.com/raforg"

COPYRIGHT

       Copyright (c) 2005-2011, 2021 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.

perl v5.36.0                   Perl::Critic::Policy::InputOutput::ProhibitBarewordDirHandles(3pm)