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Re: [Scheme-reports] Inconsistency of sequence copying procedures
Marc Feeley scripsit:
> Vectors and bytevectors have a similar external representation, yet
> bytevectors are self evaluating (page 46) and vectors are not self
> evaluating. I do not care very much if they are, or if they are not
> self-evaluating, but it should be the same for vectors and
Both are now self-evaluating.
> 2) sequence copying procedures inconsistencies
Things have changed in this area since draft 6 due to the fifth ballot;
in addition, there is an outstanding ticket for the sixth ballot. So I'll
summarize the current situation.
(list-copy list) ; WG rejected adding further arguments
(string-copy string [start [end]]) ; per SRFI 13; WG rejected fill
(substring string start end) ; backwards compatibility with R5RS
(vector-copy string [start [end [fill]]]) ; per SRFI 43
(bytevector-copy-partial bytevector start end)
;; Ticket #384 merges the last two as:
(bytevector-copy bytevector [start [end]])
;; WG rejected list-copy! as insufficiently useful
(string-copy! to at from [start [end]])
(vector-copy! to at from [start [end]])
(bytevector-copy! to at from [start [end]])
> I do not see a good reason for having different APIs (mix of required
> and optional parameters) and naming conventions for similar operations.
The WG voted for consistency with SRFI 1, SRFI 13, and SRFI 43 rather than
complete self-consistency. However, things are much more consistent now,
especially if #384 passes.
> The naming convention could be based on the one which has been in
> place for strings for a long time, i.e. substring, subvector, and
> subbytevector for extracting subsequences.
"Subblob" was informally rejected by WG as too ugly, and the
"subvector" and "subbytevector" were never suggested.
> Finally, I think the handling of the fill parameter is questionable.
> It is a bad idea for the fill parameter to have a default.
This comes from SRFI 43, but your argument is reasonable and does not
break backward compatibility. Ballot ticket #450 filed.
John Cowan cowan@x http://ccil.org/~cowan
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Our two weapons are tedium and surprise ... and ruthless disregard
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