From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: checker@d6.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] two unrelated questions
Date: Thu, 26 Apr 2001 10:13:22 +0900 [thread overview]
Message-ID: <20010426101322D.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <200104252108.OAA02055@smtp2-cm.mail.eni.net>
From: Chris Hecker <checker@d6.com>
> 1. What is the right "functional pattern" for early-outing on success
> while using an iter/map/fold type function? Say I'm using iter to
> search for something in an opaque datastructure. Should I throw
> an exception to get out, or is that bad style? I guess this
> question only makes sense for iter, since map/fold produce results
> that you theoretically want to preserve. So, the question is
> really, given an iter-style interface to a datastructure (one that
> takes an ('a -> unit)), how do you tell it to stop iterating? I
> guess if the function was ('a -> bool) you could do it that way,
> but most iters aren't ((List|Array|Hashtbl).iter, for example).
> Is throwing an exception the best bet?
How to escape with an exception is described in section 8 of the
caml-light tutorial: http://caml.inria.fr/tutorial/index.html.
So I suppose this can be described as good style.
Particularly you can see in section 8.3 how to escape with a return
value, which is a natural thing to do in a search algorithm, and is a
bit nicer than using a reference cell.
Cheers,
Jacques Garrigue
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next prev parent reply other threads:[~2001-04-26 1:13 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-25 21:08 Chris Hecker
2001-04-26 0:38 ` Patrick M Doane
2001-04-26 6:04 ` Judicaël Courant
2001-04-26 12:06 ` John Max Skaller
2001-04-27 9:12 ` Anton Moscal
2001-04-29 22:24 ` Brian Rogoff
2001-04-30 18:57 ` Fergus Henderson
2001-05-01 1:31 ` Jacques Garrigue
2001-05-01 12:45 ` [Caml-list] " Ken Friis Larsen
2001-04-27 15:09 ` [Caml-list] " Brian Rogoff
2001-04-27 17:49 ` John Max Skaller
2001-04-26 8:22 ` Andreas Rossberg
2001-04-26 1:13 ` Jacques Garrigue [this message]
2001-04-26 13:47 ` Xavier Leroy
2001-04-26 22:34 ` Chris Hecker
2001-04-26 16:57 ` Mark Seaborn
2001-04-26 22:20 ` John Max Skaller
2001-05-01 21:08 ` Brian Rogoff
2001-05-01 23:30 ` John Max Skaller
2001-05-02 0:03 ` John Max Skaller
2001-05-01 17:25 Dave Berry
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