public abstract class CompositeNode : Node {
	public List<Node> childs;
	public override NodeState Run() {
		// will be implement on derivered classes
		throw new NotImplementedException();
	}
}

public class Sequence : Composite {
	public override BH_Status Run() {
		// no child -> then failed (sometime designer forgot to add Leaf nodes)
		if(childs.Count == 0) return NodeState.Failure;
		// evaluate childs
		for(int n = 0, amount = childs.Count; n < amount; n++) {
			var state = childs[n].Run();
			// break when reach any child that return Failure or Running
			if(state != NodeState.Success) return state;
		}
		// all child are Success, then return Success
		return NodeState.Success;
	}
}

public class Selector : Composite {
	public override NodeState Run() {
		// no child -> then failed (sometime designer forgot to add Leaf node in tree)
		if(childs.Count == 0) return NodeState.Failure;
		// evaluate childs
		for(int n = 0, amount = childs.Count; n < amount; n++) {
			var state = childs[n].Run();
			// break when reach the first child with status = Sucess or Running (not Failure)
			if(state != NodeState.Failure) return state;
		}
		// no child success or running, then return failed
		return NodeState.Failure;
	}
}