Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles(3)
NAME
Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles - Write
"open my $fh, q{<}, $filename;" instead of "open FH, q{<}, $filename;".
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Using bareword symbols to refer to file handles is particularly evil
because they are global, and you have no idea if that symbol already
points to some other file 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 filehandle. Alternatively, see the IO::Handle or IO::File
or FileHandle modules for an object-oriented approach.
open FH, '<', $some_file; #not ok
open my $fh, '<', $some_file; #ok
my $fh = IO::File->new($some_file); #ok
There are three exceptions: STDIN, STDOUT and STDERR. These three
standard filehandles are always package variables.
CONFIGURATION
This Policy is not configurable except for the standard options.
SEE ALSO
IO::Handle(3)
IO::File(3)
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.
perl v5.28.2 Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles(3)
perl-critic 1.134.0 - Generated Mon Jun 3 12:04:48 CDT 2019