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From: "Sylvain BOULM'E" <Sylvain.Boulme@lip6.fr>
To: caml-list@inria.fr
Subject: Re: Tree of a certain class:
Date: Fri, 24 Sep 1999 14:18:54 +0200	[thread overview]
Message-ID: <199909241218.OAA19643@ventoux.lip6.fr> (raw)
In-Reply-To: Your message of "Fri, 24 Sep 1999 10:15:52 +0200." <37EB3338.4E226250@unibw-muenchen.de>

Hello,

Actually, #debug is an abbrevation for 
 <method debug : unit; ..>
where ".." is a row type variable, you may imagine as universally quantified.
And methods of a class are not allowed to be polymorphic. Only classes are.
So, you have to bound this row variable to a type parameter of the class. 

* So a general solution is :

class ['a] dtree =
  object
    constraint 'a=#debug
    inherit ['a] ctree
  end

* But if you want only a "debug tree", you may write :

class dtree =
  object
    inherit [debug] ctree
  end

Regards,

Sylvain.






  parent reply	other threads:[~1999-09-24 16:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1999-09-17  1:13 What am I missing? skaller
1999-09-17 12:44 ` Pierre Weis
1999-09-24  8:15   ` Tree of a certain class: Peter Schrammel
1999-09-24 12:06     ` Pierre Boulet
1999-09-24 12:18     ` Sylvain BOULM'E [this message]
1999-09-24 12:35     ` Jerome Vouillon

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