From: Sam Steingold <sds@gnu.org>
Cc: Caml List <caml-list@inria.fr>
Subject: Re: modifying hash tables
Date: Wed, 18 Jul 2007 12:01:49 -0400 [thread overview]
Message-ID: <469E396D.7010508@gnu.org> (raw)
In-Reply-To: <469E3171.7040205@gnu.org>
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Sam Steingold wrote:
> I want to modify the _current_ datum in Hashtable.iter, e.g., increment
> a count. Is this code valid?
> Hashtable.iter ht ~f:(fun ~key ~data ->
> Hashtable.replace ht ~key ~data:(data+1))
> (it appears to work, but I was told that "it is not guaranteed to work",
> i.e., the documentation does not promise that).
> If the above code is wrong, what is TRT?
in case you wondered why I think my code is reasonable:
http://www.lisp.org/HyperSpec/Body/sec_3-6.html
Hash-table traversal
For hash table traversal operations, new elements may not be added
or deleted except that the element corresponding to the current hash key
may be changed or removed.
(yes, I know OCaml is NOT Common Lisp).
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next prev parent reply other threads:[~2007-07-18 16:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-18 15:27 Sam Steingold
2007-07-18 16:00 ` [Caml-list] " Christopher L Conway
2007-07-18 16:01 ` Sam Steingold [this message]
2007-07-18 16:36 ` [Caml-list] " Brian Hurt
2007-07-18 16:08 ` [Caml-list] " David Allsopp
2007-07-18 16:38 ` Zheng Li
2007-07-18 20:38 ` [Caml-list] " Jon Harrop
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