From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: *
X-Spam-Status: No, score=1.3 required=5.0 tests=BAYES_00,INVALID_MSGID,
	MSGID_RANDY autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,68b702bd2264cada
X-Google-Attributes: gid103376,public
From: Ted Dennison <dennison@telepath.com>
Subject: Re: Dynamic redispatching
Date: 2000/01/20
Message-ID: <867ujg$ni3$1@nnrp1.deja.com>#1/1
X-Deja-AN: 575384751
References: <862gtg$meu$1@nnrp1.deja.com>
 <m3hfgazg42.fsf@baka.infomatch.bc.ca> <864ir0$5up$1@nnrp1.deja.com>
 <38875677.950A6FCA@averstar.com>
X-Http-Proxy: 1.0 x28.deja.com:80 (Squid/1.1.22) for client 204.48.27.130
Organization: Deja.com - Before you buy.
X-Article-Creation-Date: Thu Jan 20 21:27:33 2000 GMT
X-MyDeja-Info: XMYDJUIDtedennison
Newsgroups: comp.lang.ada
X-Http-User-Agent: Mozilla/4.7 [en] (WinNT; I)
Date: 2000-01-20T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <38875677.950A6FCA@averstar.com>,
  Tucker Taft <stt@averstar.com> wrote:

> You are trying to make this dispatching-on-result happen in a "return"
> statement, but at that point, there is no context from which to get
> the tag to control the dispatching.

I was figuring it would take the tag of the ultimate object transitively
through return calls. I guess not. :-(

> However, returning composite objects as results is generally less
> efficient than using OUT parameters (because OUT parameters can use
> pass-by-reference). So unless there is some compelling reason for
> these to be functions (such as they have discriminants whose value is
> not known to the caller, or they will often be combined with other
> function calls in the middle of a more complex expression), you might
> want to make them all procedures.

There isn't, so I am doing just that. Thanks.

--
T.E.D.

http://www.telepath.com/~dennison/Ted/TED.html


Sent via Deja.com http://www.deja.com/
Before you buy.