oop tutorials

[Saaa]

> Two things.
> First, a null reference is free to set up, whereas instantiating a class 
> is not free.

But always writing an extra line isn't free and if nobody would use null 
references that would be kind of stupid.
^^ thats what I thought (^_^)

>
> Second:
>
> ---
> class Bicycle {
>    Human owner;
> }
>
> auto bike = new Bicycle();
> ---
> The bike doesn't have an owner. Do you want to create a Human object that 
> refers to nobody? Well, maybe, for some purposes, but not necessarily. 
> That would probably alter your definition of Human.

bike would only hold a reference to an Human, right? and you say this is 
bad?
Sorry, I read it as having only a reference is bad .. I must read this wrong 
:/