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From: Mart van de Wege <mvdwege@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: If not Ada, what else...
Date: Wed, 22 Jul 2015 11:05:23 +0200
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Date: 2015-07-22T11:05:23+02:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On Tue, 21 Jul 2015 15:55:26 -0700, Jeffrey R. Carter wrote:
>
>> On 07/21/2015 02:51 PM, Dmitry A. Kazakov wrote:
>>> On Tue, 21 Jul 2015 22:06:54 +0100, Simon Wright wrote:
>>> 
>>>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>>>>>
>>>>> Operations do not belong to types.
>>>>
>>>> Huh?
>>> 
>>> function "*" (X : Matrix; Y : Vector) return Vector;
>>> 
>>> To which type does "*" belong?
>> 
>> A concept of programming by extension is that operations on extensible types do
>> belong to a type.
>
> Why?
>
> Anyway, that does not answer the question. To which type belongs
> multiplication?
>

I'd say it's a multimethod, being dispatched on all its parameters, not
a member of a type.

Mart

-- 
"We will need a longer wall when the revolution comes."
    --- AJS, quoting an uncertain source.