NAME

Data::Iterator::SlidingWindow - Iteration data with Sliding Window Algorithm

SYNOPSIS

  use Data::Iterator::SlidingWindow;
 
  my $ i = 0;
  my $iter = iterator 3 => sub{
      #generate/fetch next one.
      return if $i > 6;
      return $i++;
  };
 
  while(defined(my $cur = $iter->next())){
      # $cur is [1, 2, 3], [2, 3, 4], [3, 4, 5], [4, 5, 6]
  }
 

And you can use <> operator.

    while(<$iter>){
        my $cur = $_;
        ....
    }
 
 

DESCRIPTION

This module is iterate elements of Sliding Window.

METHODS

iterator($window_size, $data_source)

Iterator constructor. The arguments are:

$window_size

Windows size.

$data_source

Data source of iterator.

CODE reference:

  iterator 3 => sub{
      CODE
  };
  

CODE returns a value on each call, and if it is exhausted, returns undef. If you want yield undefined value as a meaning value.You can use 'NULL object pattern'.

  iterator 3 => sub{
     my $value = generate_next_value();
     return { value => $value };
  };

ARRAY reference:

  iterator 3 => \@array;

next()

Get next window.

AUTHOR

Hideaki Ohno <hide.o.j55{at}gmail.com>

SEE ALSO

LICENSE

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