Re: make-module question.

[Andy Wingo <wingo@pobox.com>]

Greets,

On Wed 18 Aug 2010 14:35, Ian Hulin <ian@hulin.org.uk> writes:

> On 18/08/10 15:03, Ludovic Courtès wrote:
>> Ian Hulin <ian@hulin.org.uk> writes:
>>> Also what are the args the REPL says you can supply to (make-module) ?.

> It looks like there are three optional parameters, and the code is
> trying to do a home-grown version of (ice-9 optargs) [...]

In git, the definition begins:

(define* (make-module #:optional (size 31) (uses '()) (binder #f))
  ...)

> As the lilypond C++ routine immediately adds stuff to the uses list it
> could be useful to call make-module with this parameter.
> However, how do you call the thing while getting it to accept that you
> don't want to pass it the first parameter and want to let it default the
> value, but the first positional one you are passing is actually the
> second actual one, as you don't have any list separators in Scheme like
> in C++, or Pascal or whatever. So Scheme cannot distinguish between
> (make-module ( my-obarray-size)) and (make-module ( my-uses-list))
> whereas a language with list-element separators could make this clear
> make-module ( my_obbaray_size, , );
> and make-module ( , my_uses_list ,  );

You use #:key instead of #:optional arguments. make-module needs to be
declared to have #:key arguments, though, which is not currently the
case.

Andy
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