NAME

       Array::Iterator::BiDirectional - A subclass of Array::Iterator to allow forwards and backwards iteration

VERSION

       version 0.11

SYNOPSIS

         use Array::Iterator::BiDirectional;

         # create an instance of the iterator
         my $i = Array::Iterator::BiDirectional->new(1 .. 100);

         while ($some_condition_exists) {
             # get the latest item from
             # the iterator
             my $current = $i->get_next();
             # ...
             if ($something_happens) {
                 # back up the iterator
                 $current = $i->get_previous();
             }
         }

DESCRIPTION

       Occasionally it is useful for an iterator to go in both directions, forward and backward. One example
       would be token processing. When looping though tokens it is sometimes necessary to advance forward
       looking for a match to a rule. If the match fails, a bi-directional iterator can be moved back so that
       the next rule can be tried.

METHODS

       This is a subclass of Array::Iterator, only those methods that have been added are documented here, refer
       to the Array::Iterator documentation for more information.

       has_previous([$n])
           This method works much like "hasNext" does, it will return true (1) unless the beginning of the array
           has been reached, and false (0) otherwise.

           Optional argument has the same meaning except that it specifies $nth previous element.

       previous
           This  method  is  much  like  "next".  It will return the previous item in the iterator, and throw an
           exception if it attempts to reach past the beginning of the array.

       get_previous
           This method is much like "get_next". It will return the previous item in  the  iterator,  and  return
           undef if it attempts to reach past the beginning of the array.

       look_back([$n])
           This  is  the  counterpart to "peek", it will return the previous items in the iterator, but will not
           affect the internal counter.

           Optional argument has the same meaning except that it specifies $nth previous element.

BUGS

       None that I am aware of, if you find a bug, let me know, and I will be sure to fix it.

CODE COVERAGE

       See the CODE COVERAGE section of  the  Array::Iterator  documentation  for  information  about  the  code
       coverage of this module's test suite.

SEE ALSO

       This is a subclass of Array::Iterator, please refer to it for more documenation.

ORIGINAL AUTHOR

       stevan little, <stevan@iinteractive.com>

ORIGINAL COPYRIGHT AND LICENSE

       Copyright 2004 by Infinity Interactive, Inc.

       <http://www.iinteractive.com>

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

AUTHOR

       Steven Haryanto <stevenharyanto@gmail.com>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2013 by Steven Haryanto.

       This is free software; you can redistribute it and/or modify it under  the  same  terms  as  the  Perl  5
       programming language system itself.

perl v5.18.1                                       2013-09-18                Array::Iterator::BiDirectional(3pm)