[plt-scheme] hash-ref 'manipulating' mutable hash-tables?

From: Stephen De Gabrielle (spdegabrielle at gmail.com)
Date: Wed Jul 2 05:10:11 EDT 2008


"Caveats concerning concurrent modification: A mutable hash table can
be manipulated with hash-ref,"
--  http://docs.plt-scheme.org/reference/hashtables.html

Is this right? How does hash-ref change a hash table?  (do mutable
ht's do some sort of 'query optimisation' that I'm not aware of? if
so; does this make them faster but less safe than immutable ht's?)



Stephen De Gabrielle
s.degabrielle at cs.ucl.ac.uk
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