Re: List container strawman 1.1

[Jeffrey Carter <jrcarter@acm.org>]

Darren New wrote:
> 
> My thought was that it would be better to keep a pointer to the list in
> the "iterator". That is, each iterator can only refer to one list
> (except for the "off the end" iterator which I feel is a bad design
> here), so why not?

Yes, the Position includes information that identifies the list, and
operations make sure it matches the list supplied. If they don't match,
the client has made an error and is notified via an exception. It is
never possible to supply the right list and the wrong position, or the
wrong list and the right position, and have an operation succeed.

Note that positions are not iterators. They do not iterate. Client code
may use them for iteration, but that does not make them iterators.

-- 
Jeff Carter
"You cheesy lot of second-hand electric donkey-bottom biters."
Monty Python & the Holy Grail