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lib/Algorithm/Evolutionary/Fitness/Royal_Road.pm  view on Meta::CPAN

use strict;
use warnings;

use lib qw( ../../../../lib );

=head1 NAME

Algorithm::Evolutionary::Fitness::Royal_Road - Mitchell's Royal Road function

=head1 SYNOPSIS

    my $block_size = 4;
    my $rr = Algorithm::Evolutionary::Fitness::Royal_Road->new( $block_size ); 

=head1 DESCRIPTION

Royal Road function, adds block_size to fitness only when the block is complete

=head1 METHODS

=cut

package Algorithm::Evolutionary::Fitness::Royal_Road;

our ($VERSION) = ( '$Revision: 3.1 $ ' =~ / (\d+\.\d+)/ ) ;

use base qw(Algorithm::Evolutionary::Fitness::String);

=head2 new( $block_size )

Creates a new instance of the problem, with the said block size. 

=cut 

sub new {
  my $class = shift;
  my ( $block_size ) = @_;
  my $self = $class->SUPER::new();
  $self->{'_block_size'} = $block_size;
  $self->initialize();
  return $self;
}

sub _really_apply {
    my $self = shift;
    return  $self->royal_road( @_ );
}

=head2 royal_road( $string )

Computes the royal road function with given block size. Results are
cached by default.

=cut

sub royal_road {
    my $self = shift;
    my $string = shift;
    my $cache = $self->{'_cache'};
    
    if ( $cache->{$string} ) {
	return $cache->{$string};
    }