package Iterator_Utils;

require Exporter;

use base 'Exporter';

@EXPORT_OK = qw(append nextval Iterator
                imap igrep
                iterate_function filehandle_iterator list_iterator);

%EXPORT_TAGS = ('all' => \@EXPORT_OK);

use strict;
use warnings;

<sub Iterator (&) { return $_[0] }
 ...