Imre Saling
and 1 contributors

NAME

List::Rotation::Cycle - Cycle through a list of values via a singleton object implemented as closure.

SYNOPSIS

    use List::Rotation::Cycle;

    my @array = qw( A B C );

    my $first_cycle  = List::Rotation::Cycle->new(@array);
    my $second_cycle = List::Rotation::Cycle->new(@array);

    print $first_cycle->next;  ## prints A
    print $second_cycle->next; ## prints B
    print $first_cycle->next;  ## prints C
    print $second_cycle->next; ## prints A, looping back to beginning

DESCRIPTION

Use List::Rotation::Cycle to loop through a list of values. Once you get to the end of the list, you go back to the beginning.

List::Rotation::Cycle is implemented as a Singleton Pattern. You always just get 1 (the very same) Cycle object even if you use the new method several times. This is done by using Memoize on the new method. It returns the same object for every use of new that comes with the same List of parameters.

OBJECT METHODS

new

Create a Cycle object for the list of values in the list.

next

Return the next element. This method is implemented as a closure.

AUTHOR

Imre Saling, <pelagicatcpandotorg>

COPYRIGHT and LICENSE

Copyright 2000-2004, Imre Saling, All rights reserved.

This software is available under the same terms as perl.