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Message from discussion hashtable w/o keys stored...
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vnikolov  
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 More options Jan 13 1999, 3:00 am
Newsgroups: comp.lang.lisp
From: vniko...@poboxes.com
Date: 1999/01/13
Subject: Re: hashtable w/o keys stored...
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In article <wkiueb2krx....@mit.edu>,
  David Bakhash <ca...@mit.edu> wrote:
(...)

> suppose, ideally, I want a hash table whose keys are strings and whose
> values are objects.  However, I have so many keys, and each key (string)
> is, say 50 characters long.  With 50,000 keys, this can start to really
> swallow up memory.  But if, instead, the objects in the hash buckets
> somehow contain the strings efficiently, then I can create those strings
> when needed, but not store them permanently.

So you need a hash table of a kind different from what Common Lisp
has.  You (seem to) need:

* to pass just one object to the hash table when you do the store
  (instead of one key and one object, as with CL);

* to pass a function to the hash table constructor which will later
  be called on each object being stored to compute the key.

Unless someone has already implemented such tables somewhere,
it is up to you.

Good luck,
Vassil.

Vassil Nikolov <vniko...@poboxes.com> www.poboxes.com/vnikolov
(You may want to cc your posting to me if I _have_ to see it.)
   LEGEMANVALEMFVTVTVM  (Ancient Roman programmers' adage.)

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