If you *need* object identity, then CLOS objects give you that with hashing (as I am sure you know). But a slot in the struct containing a unique integer (or a gensym if you prefer) can also give you identity. I think I am perhaps not understanding exactly what you want.
-Jason > On 3 Dec 2017, at 12:38, Antoniotti Marco <antoniotti.ma...@disco.unimib.it> > wrote: > > >> On Dec 3, 2017, at 12:27 , Jason Cornez <jcor...@alum.mit.edu> wrote: >> >> Add an integer slot on the structs; hash on that? -Jason > > I forgot to mention it. THAT is another thing I want to avoid because I need > to share subgraphs (DAGs). I need to hash on the “object identity”. > > Cheers > — > MA > > > > > > >> >> Sent from my iPhone >> >>> On 3 Dec 2017, at 12:02, Antoniotti Marco >>> <antoniotti.ma...@disco.unimib.it> wrote: >>> >>> Hi >>> >>> I am fooling around with a problem that eventually will have to use a hash >>> table on “triples” of “integers” and “structures". Triples I can portably >>> pass to the EQUAL hash table. I cannot use an EQUALP hash table, because I >>> would end up wasting to much time. >>> >>> Here is the rub: my triples <N, O1, O2> need to use the “object identity” >>> of O1 and O2 (two structs). I could switch to an EQL hash table keyed on >>> (HASH-TRIPLE-KEY N O1 O2). How would you proceed (or write HASH-TRIPLE), >>> while staying as much portable as possible? As you well know SXHASH is >>> practically useless. >>> >>> Thanks >>> — >>> Marco >>> >>> >>> >>> >>> >>> >>> -- >>> Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 >>> DISCo, Università Milano Bicocca U14 2043 >>> http://bimib.disco.unimib.it >>> Viale Sarca 336 >>> I-20126 Milan (MI) ITALY >>> >>> Please check: http://cdac2018.lakecomoschool.org >>> Please check: http://troncopackage.org >>> >>> Please note that I am not checking my Spam-box anymore. >>> Please do not forward this email without asking me first (cum grano salis). >>> >>> >>> >>> >>> >> >> > > -- > Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 > DISCo, Università Milano Bicocca U14 2043 > http://bimib.disco.unimib.it > Viale Sarca 336 > I-20126 Milan (MI) ITALY > > Please check: http://cdac2018.lakecomoschool.org > Please check: http://troncopackage.org > > Please note that I am not checking my Spam-box anymore. > Please do not forward this email without asking me first (cum grano salis). > > > > >
