Re: [RFC] B+Tree library V2

["Jörn Engel" <joern@logfs.org>]

On Thu, 8 January 2009 17:50:04 +0100, Johannes Berg wrote:
> 
> I see this:
> 
> 
> - * Second trick is to special-case the key "0" or NUL.  As seen above, this
> - * value indicates an unused slot, so such a value should not be stored in the
> - * tree itself.  Instead it is stored in the null_ptr field in the btree_head.
> 
> Does that mean that wasn't true, and I can store a 0 key?

Ahh, don't look at that!  The embarrassment is unbearable!  Go away!

Yes, I used to have a special exception for a 0 key.  But I also have
a special exception for a NULL value and can test against that instead
of testing against a 0 key.  It is even faster, because the value is not
variable-sized.  In hindsight it is hard to explain why I ever did that.

Jörn

-- 
Unless something dramatically changes, by 2015 we'll be largely
wondering what all the fuss surrounding Linux was really about.
-- Rob Enderle