perlfilter - Source Filters
-
=head1 DESCRIPTION
This article is about a little-known feature of Perl called
package Debug;
use strict;
+ use warnings;
use Filter::Util::Call ;
use constant TRUE => 1 ;
CPAN/modules/by-module/Filter
+Starting from Perl 5.8 Filter::Util::Call (the core part of the
+Source Filters distribution) is part of the standard Perl distribution.
+Also included is a friendlier interface called Filter::Simple, by
+Damian Conway.
+
=head1 AUTHOR
Paul Marquess E<lt>Paul.Marquess@btinternet.comE<gt>