From: rossberg@ps.uni-sb.de
To: "skaller" <skaller@users.sourceforge.net>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Improper generic equality in Caml (Rossberg's SML vs Caml)
Date: Sun, 17 Sep 2006 14:43:44 +0200 (CEST) [thread overview]
Message-ID: <1932.72.254.55.251.1158497024.squirrel@www.ps.uni-sb.de> (raw)
In-Reply-To: <1158486341.5405.11.camel@rosella.wigram>
skaller wrote:
> On Sun, 2006-09-17 at 07:08 +0200, rossberg@ps.uni-sb.de wrote:
>
>> This problem can sometimes make translation from SML (which has Leibniz
>> equality)
>
> It does? I'm curious how it handles
>
> (a) functions
> (b) abstract types
By statically ruling out the use of generic equality on them. That's the
purpose of eqtypes in SML.
For the latter, the implementor of the abstract type can choose to allow
generic equality if the abstract equality coincides with representational
equality.
Of course, this solution comes with its own set of problems...
Btw, SML'97 even goes as far as disallowing the use of generic equality on
floats, because IEEE equality does not meet the requirements. You have to
use a special operator Real.== to compare them.
- Andreas
next prev parent reply other threads:[~2006-09-17 12:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-09 3:11 Comparing two things of any two types, in pure OCaml oleg
2006-09-09 7:13 ` [Caml-list] " Jacques Garrigue
2006-09-13 9:14 ` [Caml-list] Comparing two things of any two types, in pure oleg
2006-09-16 18:53 ` Improper generic equality in Caml (Rossberg's SML vs Caml) Diego Olivier Fernandez Pons
2006-09-16 20:58 ` [Caml-list] " Jacques Garrigue
2006-09-17 5:08 ` rossberg
2006-09-17 9:45 ` skaller
2006-09-17 12:43 ` rossberg [this message]
2006-09-14 4:36 ` [Caml-list] Comparing two things of any two types, in pure OCaml brogoff
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