From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: andrew@absentis.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Passing self to a new object
Date: Tue, 30 Oct 2001 17:09:19 +0900 [thread overview]
Message-ID: <20011030170919O.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <20011029203036.A1039@alba.sw>
From: Andrew Lawson <andrew@absentis.com>
> > The general solution to this is to first define a class type:
> > class type xyz_t = object ('self)
> > method
> > btnNew : ...
> > ...
> > end
>
> Well this gives me an excuse to start playing with types and
> interfaces anyway. Is this a 'known problem, will be sorted
> eventually' or a 'just live with it' sort of thing?
Well, this was delayed for a very long time, but I'm starting to think
that we should really do something about it.
> > Then change the code in btnNew to
> > new abc (self :> xyz_t)
>
> Casting! and here was I giving a C++ programmer some abuse
> about this last week :)
No, this is a coercion. This is perfectly type-safe (and checked at
compile time). This is needed for type inference. Languages with
explicit type information, like Java, do it silently.
Cheers,
Jacques Garrigue
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prev parent reply other threads:[~2001-10-30 8:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-28 15:56 Andrew Lawson
2001-10-29 9:02 ` Jacques Garrigue
2001-10-29 20:30 ` Andrew Lawson
2001-10-30 8:09 ` Jacques Garrigue [this message]
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