bareword::filehandles(3) User Contributed Perl Documentation bareword::filehandles(3)NAME
bareword::filehandles - disables bareword filehandles
VERSION
version 0.003
SYNOPSIS
no bareword::filehandles;
open FH, $file # dies
open my $fh, $file; # doesn't die
print FH $string # dies
print STDERR $string # doesn't die
DESCRIPTION
This module lexically disables the use of bareword filehandles with builtin functions, except for the special builitin filehandles "STDIN",
"STDOUT", "STDERR", "ARGV", "ARGVOUT" and "DATA".
METHODS
unimport
Disables bareword filehandles for the remainder of the scope being compiled.
import
Enables bareword filehandles for the remainder of the scope being compiled.
SEE ALSO
perlfunc, B::Hooks::OP::Check.
AUTHOR
Dagfinn Ilmari Mannsaaker <ilmari@ilmari.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Dagfinn Ilmari Mannsaaker.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
perl v5.18.2 2011-03-15 bareword::filehandles(3)
Check Out this Related Man Page
Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHUsereContributed Perl DocPerl::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
IO::File
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 v5.16.3 2014-06-09 Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles(3)
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