From: "Stéphane Glondu" <steph@glondu.net>
To: Radzevich Belevich <radzevich.belevich@gmail.com>
Cc: Caml List <caml-list@inria.fr>
Subject: Re: [Caml-list] why Hashtbl.t are not covarint?
Date: Wed, 14 Jan 2009 09:54:42 +0100 [thread overview]
Message-ID: <496DA852.5040508@glondu.net> (raw)
In-Reply-To: <1231920145.2711.8.camel@serphost.localdomain>
Radzevich Belevich a écrit :
> hashtbl.mli: type ('a,'b) t
> Why not "type ('a,+'b) t"?
For the same reason as 'a in 'a ref, i.e. mutable things cannot be
covariant.
Cheers,
--
Stéphane
prev parent reply other threads:[~2009-01-14 8:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-14 8:02 Radzevich Belevich
2009-01-14 8:54 ` Stéphane Glondu [this message]
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