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Perl::Critic::Policy::InputOutput::ProhibitTwoArgOpen.3pm

NAME

Perl::Critic::Policy::InputOutput::ProhibitTwoArgOpen

DESCRIPTION

The three-argument form of "open" (introduced in Perl 5.6) prevents subtle bugs that occur when the filename starts with funny characters like '>' or '<'. The IO::File module provides a nice object-oriented interface to filehandles, which I think is more elegant anyway.

   open( $fh, '>output.txt' );          # not ok
   open( $fh, q{>}, 'output.txt' );     # ok
 
   use IO::File;
   my $fh = IO::File->new( 'output.txt', q{>} ); # even better!
 
 

It's also more explicitly clear to define the input mode of the file, as in the difference between these two:

   open( $fh, 'foo.txt' );       # BAD: Reader must think what default mode is
   open( $fh, '<', 'foo.txt' );  # GOOD: Reader can see open mode
 
 

NOTES

The only time you should use the two-argument form is when you re-open STDIN, STDOUT, or STDERR. But for now, this Policy doesn't provide that loophole.

SEE ALSO

IO::Handle

IO::File

AUTHOR

Jeffrey Ryan Thalhammer <thaljef@cpan.org>

COPYRIGHT

Copyright (C) 2005-2007 Jeffrey Ryan Thalhammer. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.