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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Rational for not making cursor tagged in Containers
Date: Fri, 20 Apr 2007 15:54:06 -0400
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Date: 2007-04-20T15:54:06-04:00
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Ray Blaak <rAYblaaK@STRIPCAPStelus.net> writes:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>> On Fri, 20 Apr 2007 17:05:28 GMT, Ray Blaak wrote:
>> 
>> >> X := Y; -- Who owns assignment? 1 or X?

Was this supposed to say "Y or X"?  Or is 1 presumed to be the value of Y?
I think I'm missing Dmitry's point here, unless it was to say that
for symmetric operations, it's hard to say which type it "belongs" to.

>> > X, of course.
>> 
>> So, it should dispatch on X, right? Welcome back to C++!
>
> No sweat. That is not the most serious of C++'s pitfalls.
>
> In practice though, I use C#/Java for which the "language" owns assignment,
> and no one else. Of course simple assignment does not copy fields, so explicit
> clone/copy methods need to be used instead, which more clearly indicates
> ownership/dispatching rules, etc.

Yeah.  In this area, Java is sort of like the situation in Ada if all
composite types were required to be limited.  You can use ":=" on access
types and integer types...

- Bob