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.IX Title "Perl::Critic::Policy::InputOutput::ProhibitBarewordDirHandles 3pm"
.TH Perl::Critic::Policy::InputOutput::ProhibitBarewordDirHandles 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::InputOutput::ProhibitBarewordDirHandles \- Write "opendir my $dh, $dirname;" instead of "opendir DH, $dirname;".
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "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 \f(CW\*(C`local\*(C'\fRizing 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.
.PP
.Vb 9
\&    opendir DH, $some_dir;            #not ok
\&    opendir *DH, $some_dir;           #not ok
\&    opendir \e*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
.Ve
.PP
And Perl7 will probably drop support for bareword filehandles.
.SH CONFIGURATION
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles::Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles
.PP
IO::Handle
.PP
IO::Dir
.SH AUTHOR
.IX Header "AUTHOR"
Jeffrey Ryan Thalhammer <jeff@imaginative\-software.com>,
\&\f(CW\*(C`github.com/pali\*(C'\fR, \f(CW\*(C`github.com/raforg\*(C'\fR
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2005\-2011, 2021 Imaginative Software Systems.  All rights reserved.
.PP
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.