Hashing "object identities"

[Antoniotti Marco]

> On Dec 3, 2017, at 12:27 , Jason Cornez <jcornez at 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.marco at 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
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>> 
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> 

--
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).