From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.1.3 Received: from mail1-relais-roc.national.inria.fr (mail1-relais-roc.national.inria.fr [192.134.164.82]) by yquem.inria.fr (Postfix) with ESMTP id 14469BC69 for ; Sat, 29 Dec 2007 00:55:34 +0100 (CET) X-IronPort-AV: E=Sophos;i="4.24,218,1196636400"; d="scan'208";a="6118323" Received: from smtpoutm.mac.com ([17.148.16.80]) by mail1-smtp-roc.national.inria.fr with ESMTP; 29 Dec 2007 00:55:30 +0100 Received: from mac.com (asmtp008-s [10.150.69.71]) by smtpoutm.mac.com (Xserve/smtpout017/MantshX 4.0) with ESMTP id lBSNtWGa018828 for ; Fri, 28 Dec 2007 15:55:32 -0800 (PST) Received: from [10.62.243.100] (mobile-032-151-114-016.mycingular.net [32.151.114.16] (may be forged)) (authenticated bits=0) by mac.com (Xserve/asmtp008/MantshX 4.0) with ESMTP id lBSNtRhK025756 for ; Fri, 28 Dec 2007 15:55:29 -0800 (PST) Message-Id: <4F8745F4-A1C4-4896-BC1E-0C10E82BFB02@mac.com> From: Gordon Henriksen To: "caml-list@yquem.inria.fr" In-Reply-To: <200712282337.23952.jon@ffconsultancy.com> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes X-Mailer: iPhone Mail (3B48b) Mime-Version: 1.0 (iPhone Mail 3B48b) Subject: Re: [Caml-list] "OCaml gives you only monomorphic methods in classes." Content-Transfer-Encoding: 7bit Date: Fri, 28 Dec 2007 16:55:32 -0700 References: <200712282337.23952.jon@ffconsultancy.com> X-Spam: no; 0.00; ocaml:01 overloading:01 inference:01 milner:01 inference:01 ocaml:01 haskell:01 overloading:01 polymorphism:01 odersky:01 beginner's:01 bug:01 28,:98 2007,:98 frog:98 Jon, consider the case of Java or C++ method (and function) overloading. This form of static dispatch is quite distinct from virtual method dispatch, and is indeed at odds with type inference. - Gordon On Dec 28, 2007, at 16:37, Jon Harrop wrote: > > I just read this quote and I do not understand what it means: > > "In particular, the Hindley/Milner style of type inference used in > languages > such as OCaml or Haskell is incompatible with lots of assumptions of > OO > languages. One incompatibility is with overloading. That's why OCaml > does not > let you write + for both integer and floating point addition. Another > incompatibility is with higher order polymorphism. That's why OCaml > gives you > only monomorphic methods in classes." - Martin Odersky > > In what way must methods be monomorphic in OCaml classes? > > -- > Dr Jon D Harrop, Flying Frog Consultancy Ltd. > http://www.ffconsultancy.com/products/?e > > _______________________________________________ > Caml-list mailing list. Subscription management: > http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list > Archives: http://caml.inria.fr > Beginner's list: http://groups.yahoo.com/group/ocaml_beginners > Bug reports: http://caml.inria.fr/bin/caml-bugs