From: Pierre Weis <Pierre.Weis@inria.fr>
To: tm1@cise.npl.co.uk (Toby Moth)
Cc: caml-list@inria.fr
Subject: Re: monomorphism is ... ?
Date: Thu, 21 Jan 1999 16:32:00 +0100 (MET) [thread overview]
Message-ID: <199901211532.QAA18132@pauillac.inria.fr> (raw)
In-Reply-To: <199901211150.LAA06705@squall.cise.npl.co.uk> from "Toby Moth" at Jan 21, 99 11:50:29 am
> Am I right in thinking that the following holds ?
>
> polymorphic = has type 'a = for all
> monomorphic = has type '_a = exists
>
> Here '=' stands for 'equal in spirit'.
>
>
> Toby Moth
Yes you are 'right in spirit': more precisely '_a means an unknown
type, that should be precised by further constraints or computations
(as are unknowns in math). There is no quantifier in a type with '_a,
as opposed to existential types (type scheme with existential
quantifier in fact).
Pierre Weis
INRIA, Projet Cristal, Pierre.Weis@inria.fr, http://cristal.inria.fr/~weis/
next prev parent reply other threads:[~1999-01-21 15:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-21 11:50 Toby Moth
1999-01-21 15:32 ` Pierre Weis [this message]
1999-01-21 15:45 ` Simon Helsen
1999-01-21 18:24 ` Pierre Weis
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