Re: [gobo-eiffel-develop] Iterators for DS_TABLE?

[Eric B. <er...@go...>]

Colin Adams wrote:
> Quite often I have a need to iterate over a DS_HASH_TABLE and inspect
> both the item and the key. Currently I have no choice but to use a
> cursor, as the features in the Iteration feature clause do not pass
> the key to the agent.

I sometimes have the same need.

> It would be nice to have do_all_key, do_if_key etc. where the agent
> receives both the item and the key. Ideally, these would be declared
> for DS_TABLE.

These feature names suggest that only the key is passed to the
agent. I think that we need the three kinds of iterators:
over the items, over the keys, and over both. The most difficult
part is to find names. What about `do_all', `do_all_key' and
`do_all_keyed'? Any better suggestion?

Well, in fact to iterate only on keys I guess we can do
`my_table.keys.do_all'... So, we might need only two kinds of
iterators after all. What about `do_all' and `do_all_with_key',
the latter being similar to `do_all_with_index'?

Note that DS_TABLE is not linear. Only DS_SPARSE_TABLE is.
I don't remember why DS_TABLE is not linear, but I'm not
currently in a mood to change that to make it linear.

-- 
Eric Bezault
mailto:er...@go...
http://www.gobosoft.com