linux-kernel - Re: [RFC] B+Tree library

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Message-ID: <36ca99e90810310645i23fb93ddmdbe93f65905a2f80@mail.gmail.com>
Date:	Fri, 31 Oct 2008 14:45:55 +0100
From:	"Bert Wesarg" <bert.wesarg@...glemail.com>
To:	"Johannes Berg" <johannes@...solutions.net>
Cc:	"Jörn Engel" <joern@...fs.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] B+Tree library

On Fri, Oct 31, 2008 at 14:16, Johannes Berg <johannes@...solutions.net> wrote:
>
>> +static inline size_t btree_visitorl(struct btree_headl *head, long opaque,
>> +             visitorl_t func2)
>> +{
>> +     return btree_visitor(&head->h, &btree_geo32, opaque, visitorl, func2);
>> +}
>
> Incidentally, do you think it would be possible to implement a kind of
>
> btree_for_each_entry(e, ...) {
>        do something with e
> }

#define btree_for_each_entryl(__elem, __head, __opaque, ...)            \
({                                                                      \
    void f2(void *__elem, long opaque, unsigned long key, size_t index) \
    {                                                                   \
        (__VA_ARGS__);                                                  \
    }                                                                   \
    btree_visitorl(__head, __opaque, f2);                               \
});

usage:

btree_for_each_entryl(e, head, opaque, {
    do something with e
})

looks strange but works.

Bert

>
> macro or function/macro combination? You seem to be doing a recursive
> walk across the tree, would it be useful to have a linked list at the
> lowest level of nodes to be able to iterate more easily?
>
> johannes
>
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