underscore - outlaws global $_


underscore documentation Contained in the underscore distribution.

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NAME

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underscore - outlaws global $_

VERSION

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$Id: underscore.pm,v 0.1 2007/12/25 08:30:14 dankogai Exp dankogai $

SYNOPSIS

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  no underscore; # outlaws $_
  while(<>){ # croaks here!
    print;
  }
  use underscore;
  # back to normal

DESCRIPTION

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This module detects the use of global $_ and croaks. If you want it to carp or confess, simply

  no underscore 'carp';

You can also use your custom subroutine like

  no underscore sub { ... }

You can also customize the error message like

  no undersocore 'croak', 'I said not to use $_'!

EXPORT

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None

AUTHOR

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Dan Kogai, <dankogai at dan.co.jp>

Original Idea by Tom Christiansen in Perl Cookbook, p. 543

BUGS

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Please report any bugs or feature requests to bug-underscore at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=underscore. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

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You can find documentation for this module with the perldoc command.

    perldoc underscore

You can also look for information at:

* RT: CPAN's request tracker

http://rt.cpan.org/NoAuth/Bugs.html?Dist=underscore

* AnnoCPAN: Annotated CPAN documentation

http://annocpan.org/dist/underscore

* CPAN Ratings

http://cpanratings.perl.org/d/underscore

* Search CPAN

http://search.cpan.org/dist/underscore

COPYRIGHT & LICENSE

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underscore documentation Contained in the underscore distribution.
package underscore;
use warnings;
use strict;
use Carp ();
our $VERSION = sprintf "%d.%02d", q$Revision: 0.1 $ =~ /(\d+)/g;

sub TIESCALAR{
    my ($pkg, $code, $msg) = @_;
    bless [$code, $msg], $pkg;
}

sub unimport {
    my $pkg    = shift;
    my $action = shift;
    no strict 'refs';
    my $code =
        ref $action ? $action
      : $action     ? \&{ 'Carp::' . $action }
      :               \&Carp::croak;
    my $msg = shift || '$_ is forbidden';
    untie $_ if tied $_;
    tie $_, __PACKAGE__, $code, $msg;
}

sub import{  untie $_ }

sub FETCH{ $_[0]->[0]($_[0]->[1]) }
sub STORE{ $_[0]->[0]($_[0]->[1]) }

1; # End of underscore
__END__