############ VectorSpace Utility #######################
package VectorSpace;
use Object;
@VectorSpace::ISA = qw(Object);
sub init {
    my ($self) = @_;
    $self->set(space => []);
    return $self;
}
sub add_dimension {
    my ($self, $dim_name, $data) = @_;
    my $space = $self->get('space');
    my $count = ref $data ? $#$data + 1 : $data;
    my $dimension = { name => $dim_name,
                      count => $count,
                      data => $data };
    push(@$space, $dimension);
    return $dimension;
}

sub initialize_iterator {
    my ($self) = @_;
    my $point = [];
    for (@{$self->get('space')}) {
        push (@$point, 0);
    }
    $self->set( position => 0 );
    $self->set( point => $point );
}
sub point {
    my ($self) = @_;
    my $point = $self->get('point');
    my $space = $self->get('space');
    my @res;
    for (0..$#$point) {
        push(@res, $space->[$_]->{data}->[$point->[$_]]);
    }
    return \@res;
}
sub increment_iterator {
    my ($self) = @_;
    my $point = $self->get('point');
    my $pos = $self->get('position');
    my $space = $self->get('space');

    return $self->_next_point($pos);
}
sub _next_point {
    my ($self, $pos) = @_;
    my $point = $self->get('point');
    my $space = $self->get('space');

    if ($pos > $#$point) {
        ## end of iteration
        return;
    }
    $point->[$pos]++;
    if ($point->[$pos] >= $space->[$pos]->{count}) {
        $point->[$pos] = 0;
        return $self->_next_point($pos+1);
    }
    return 1;
}
##################  End VectorSpace Utility #############
## Sample Usage ##
    use Data::Dumper;
    my $vec = VectorSpace->new( );
    $vec->add_dimension( length => [1..3] );
    $vec->add_dimension( height => [1..3] );
    print Dumper $vec;
    $vec->initialize_iterator();
    my $c;
    while (1) {
        my $data = $vec->point();
        print Dumper $data;
        last if ! $vec->increment_iterator();
    }