Re: Porting SRFI 69 to PLT

--- David Van Horn <[email protected]> wrote:

> Chongkai Zhu wrote:
> > I'm porting SRFI 69 "Basic hash tables" to PLT. Current idea is:
> >=20
> > 1 Constructing the 'hash function bashed on PLT's 'equal-hash-code;
> > 2 Using PLT's struct directly instead of SRFI-9.
>=20
> I'm not sure what your two points are exactly... PLT's implementation o=
f
> SRFI 9 is in terms of its own structure system, so defining a SRFI 9
> structure is really the same as defining a PLT structure (I believe).

Yes, PLT's implementation of SRFI 9 is a macro to convert record into
struct. But will converting that manually a bit more efficient?

>=20
> SRFI 69 is just a subset of the functionality of PLT's hash tables with
> a slightly different interface.  Porting it to PLT should just be a
> matter of mapping one interface to the other (maybe there are more
> subtle issues I'm forgetting about).  You shouldn't need to use the
> reference implementation at all, or implement any datastructures.
>=20

No. Hash table of SRFI 69 can accept a user defined hash function, and
a user defined equal? function. Hash table of PLT uses build in hash
function, and only support (R5RS's) equal? / eq? . So SRFI 69 is not a
subset, but a superset of the functionality of PLT's hash table.

> David

Chongkai


	=09
__________________________________=20
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