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use strict; #-*-cperl-*- |
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use warnings; |
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use lib qw( ../../../../lib ); |
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=head1 NAME |
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Algorithm::Evolutionary::Fitness::Base - Base class for fitness functions |
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=head1 SYNOPSIS |
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Shouldn't be used directly, it's an abstract class whose siblings are |
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used to implement fitness functions. |
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=head1 DESCRIPTION |
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This module includes functionality that should be common to all fitness. Or at least it |
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would be nice to have it in common. It counts the number of evaluations and includes a common API for caching evaluations. |
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=head1 METHODS |
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=cut |
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package Algorithm::Evolutionary::Fitness::Base; |
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use Carp; |
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our $VERSION = '3.1'; |
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=head2 new() |
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Initializes common variables, like the number of evaluations. Cache is not initialized. |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless $self, $class; |
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$self->initialize(); |
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return $self; |
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} |
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=head2 initialize() |
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Called from new, initializes the evaluations counter. |
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=cut |
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sub initialize { |
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my $self = shift; |
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$self->{'_counter'} = 0; |
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$self->{'_cache'} = {}; # This is optional; should be used from derived classes |
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} |
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=head2 apply( $individual ) |
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Applies the instantiated problem to a chromosome. Actually it is a |
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wrapper around C<_apply> |
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=cut |
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sub apply { |
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my $self = shift; |
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my $individual = shift; |
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$self->{'_counter'}++; |
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return $self->_apply( $individual ); |
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} |
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=head2 _apply( $individual ) |
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This is the one that really does the stuff. Should be overloaded by |
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derived clases |
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=cut |
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sub _apply { |
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croak "You should have overloaded this\n"; |
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} |
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=head2 evaluations() |
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Returns the number of evaluations made with this object. Useful for |
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collecting stats |
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=cut |
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sub evaluations { |
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my $self = shift; |
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return $self->{'_counter'}; |
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} |
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=head2 reset_evaluations() |
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Sets to 0 the number of evaluations; useful for repeated use of the fitness object |
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=cut |
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sub reset_evaluations { |
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my $self = shift; |
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$self->{'_counter'} = 0; |
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} |
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=head2 cache() |
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Returns a reference to the internal evaluations cache. Not very encapsulated, but... |
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111
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=cut |
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sub cache { |
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my $self = shift; |
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return $self->{'cache'}; |
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} |
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=head1 Known subclasses |
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=over 4 |
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=item * |
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=item * |
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=item * |
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=item * |
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=item * |
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=item * |
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=item * |
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=item * |
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=item * |
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=back |
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=head1 Copyright |
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This file is released under the GPL. See the LICENSE file included in this distribution, |
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or go to http://www.fsf.org/licenses/gpl.txt |
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=cut |
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"What???"; |