From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: eizneckam@gmail.com
Cc: skaller@users.sourceforge.net, caml-list@inria.fr
Subject: Re: [Caml-list] syntax bug: copying records
Date: Wed, 21 Dec 2005 19:41:37 +0900 (JST) [thread overview]
Message-ID: <20051221.194137.12318829.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <a7af81520512202213u2f60ff5ci101d473ee3114f8e@mail.gmail.com>
From: Mackenzie Straight <eizneckam@gmail.com>
> On 12/20/05, skaller <skaller@users.sourceforge.net> wrote:
> > If x is a record then { x } should be a copy of it. But this
> > doesn't work, I am using this ugly workaround instead:
> >
> > { x with dummy_field = x.dummy_field }
> >
> > Surely there is a better way?
>
> Perhaps:
>
> let copy (x:'a) = (Obj.obj (Obj.dup (Obj.repr x)) : 'a)
Not a very good idea:
# copy 3;;
Segmentation fault
This also explains why you need at least one record field in the
"with" notation, otherwise there is no way to know for sure the type
of the record you're copying.
Jacques Garrigue
next prev parent reply other threads:[~2005-12-21 10:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-21 5:22 skaller
2005-12-21 6:13 ` [Caml-list] " Mackenzie Straight
2005-12-21 10:41 ` Jacques Garrigue [this message]
2005-12-21 11:00 ` skaller
2005-12-21 18:07 ` Mackenzie Straight
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