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lib/AI/Pathfinding/SMAstar.pm  view on Meta::CPAN

	_state           => $state,
	_eval_func      => $state_eval_func,
	_goal_p_func    => $state_goal_p_func,
	_num_successors_func => $state_num_successors_func,
	_successors_iterator => $state_successors_iterator,
	_get_data_func  => $state_get_data_func,
	);
    
    
    my $fcost = AI::Pathfinding::SMAstar::Path::fcost($state_obj);
    # check if the fcost of this node looks OK (is numeric)
    unless(Scalar::Util::looks_like_number($fcost)){
	croak "Error:  f-cost of state is not numeric.  Cannot add state to queue.\n";	
    }
    $state_obj->f_cost($fcost);

    # check if the num_successors function returns a number
    my $num_successors = $state_obj->get_num_successors();
    unless(Scalar::Util::looks_like_number($num_successors)){
	croak "Error:  Number of state successors is not numeric.  Cannot add state to queue.\n";	
    }

    # test out the iterator function to make sure it returns
    #  an object of the correct type
    my $classname = ref($state);
    my $test_successor_iterator = $state_obj->{_successors_iterator}->($state);
    my $test_successor = $test_successor_iterator->($state);
    my $succ_classname = ref($test_successor);