[Pika-dev] Re: Hashtrees a bit unflexible

[Andreas Rottmann]

Tom Lord <address@hidden> writes:

> The memchunk is constant throughout the tree, right?   In other words,
> all of the keys and values in a given table use the same memchunk?
>
> I would usually solve that by using a different `struct
> hashtree_rules' for each memchunk.   Something like:
>
>
>       struct my_hashtree_rules
>         {
>           struct hashtree_rules rules;
>
>           t_memchunk chunk;
>         };
>
>
> In the free_fn, you'll get the address of the `rules' field of one of
> these --- and you can cast that back to being the address of a `struct
> my_hashtree_rules'.
>
> Hashtree is _lower_level_ than the glib hash tables -- but that's on
> purpose.  It's intended to be suitable (flexible) for implementing
> more specialized tables with higher level intefaces although, yes, it
> does wind up often being used directly.
>
Ok, now that you explain it, it really makes sense; I just wanted to
clarify if extending the rules this way is the "proper" way to do it.

Thanks, Andy
-- 
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A. Because it breaks the logical sequence of discussion
Q. Why is top posting bad?