Re: Constante NIL

From: Francois Rouaix (frouaix@liquidmarket.com)
Date: Tue Jun 01 1999 - 18:16:55 MET DST

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Message-Id: <199906011616.JAA24995@fiji01.liquidmarket.com>
From: Francois Rouaix <frouaix@liquidmarket.com>
To: Vyskocil Vladimir <vyskocil@math.unice.fr>
Subject: Re: Constante NIL
Date: Tue, 01 Jun 1999 09:16:55 -0700

> N'est t'il pas concevable de rajouter a Objectif Caml une constante
> NIL, UNDEF ou je sais pas trop comment la nommer dont la valeur serait
> '_a. Ceci permettrait d'initialiser "par defaut", par exemples, les
> variables d'instances d'une classe lorsque l'on ne possede aucune
> valeur par defaut du bon type.

In this particular case (dummy initialization value for a CamlTk
widget), you could use Widget.default_toplevel, or Widget.dummy.
It's inelegant and a bit dangerous, but neither as bad as using
a Widget.widget option type, or as drastic as adding null pointers
in the language.

--f

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