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Re: Awaken, discussion!




On Monday, Oct 27, 2003, at 22:46 US/Eastern, Alex Shinn wrote:

A couple comments.

For vector-copy! Guile provides vector-move-left! and
vector-move-right!, so that you can safely copy a vector onto itself
(useful for implementing -insert/-delete).  You don't really need the
-left!/-right! distinction, so long as you check the TSTART vs. FSTART
(if TSTART is smaller you copy left->right, if FSTART is smaller you
copy right->left).  So the API can remain the same but it's probably
worth requiring in the SRFI that TARGET and VEC are allowed to be the
same vector.

This sounds like a good idea (in fact, it's what SRFI 13 does with its
STRING-COPY!).  I shall put this in the next revision of the document
and implementation.

For the CMP of vector-binary-search, is there a consensus on returning
symbols?

Nope.  That was pretty arbitrary on my part.

You could pass a < predicate which is consistent with the sort
SRFI and allows use of built-ins like string-ci<?, or use a comparator
with a positive/negative/zero as in C which allows the use of the
built-in - procedure.

Yes, I realized a while ago that it would be better to use positive/
zero/negative results for the comparison procedure.  I shall change
this as well.

--
Alex

Of course, you didn't comment on the insertion and deletion stuff like
I asked you to...that stuff is about the only reason I haven't made
the final word to finalize the SRFI.

And it occurs to me that no one mentioned anything about the /INDEX
variants of VECTOR-MAP[!] and VECTOR-FOR-EACH; the document doesn't
specify where the index argument is.  I'd prefer it to be the first
argument.  Would anyone mind if I made this change, even though it's
incompatible with the current reference implementation?  (which, of
course, I shall fix as well)