Re: [Sisc-users] SRFI 69

Dan <[email protected]> writes:

> I'm replying privately as this may become boring for those not
> interested.

It's an appropriate discussion for sisc-devel -> cc'ing that.

> Like you said initially, the "right way" is a lot of work.

Yes, but in SISC we generally prefer to do The Right Thing :)

>> we want all hashtable implementations to be sub-types of a common
>> hashtable base
>
> Sorry if this is obvious, but why the type hierarchy requirement?

The SISC type system is used for things like generic procedures. If I
write a generic proc that takes a hash table as an argument, I'd want to
be able to specify a single type.

> We could let hashtable? return #t only for Java hashtables, and SRFI
> 69 hash-table? return #t both for Scheme hashtables and Java
> hashtables.  Luckily, the names of the functions are distinct.

> This would not break any existing SISC-based code, and would allow
> code based on SRFI-69 to run -- if I'm not missing something.

You might as well use the srfi-69 reference implementation in its
entirety, keeping it completely separate from the existing hashtable
implementation in SISC. That is the quickest way to srfi-69
compatibility, but is far from The Right Thing To Do.


Matthias



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