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.