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doc: add some information

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Daniel Kochmanski 2017-04-28 22:18:37 +02:00
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src/doc/new-doc/standards/hashtables.txi
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@ -15,6 +15,11 @@ keyword argument to @t{cl:make-hash-table} with the desired kind of
weakness value (@t{NIL} means that the hash table has only strong
references).
For more information see
@url{https://www.haible.de/bruno/papers/cs/weak/WeakDatastructures-writeup.html,Weak
References - Data Types and Implementation} by Bruno Haible.
@lspindex hash-table-weakness
@deffn {ext} {hash-table-weakness} ht
Returns type of the hash table weakness. Possible return values are:
@t{:key}, @t{:value}, @t{:key-and-value}, @t{:key-or-value} or @t{NIL}.