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
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,bd40601768eaf8fd
X-Google-Attributes: gid103376,public
From: tmoran@bix.com
Subject: Re: Proposed Ada features (was Re: Array of Variant Records
 Question...)
Date: 1999/09/10
Message-ID: <xagC3.365$Wt1.15026@typhoon-sf.snfc21.pbi.net>#1/1
X-Deja-AN: 523578986
References: <37d9658c@news1.prserv.net>
X-Complaints-To: abuse@pacbell.net
X-Trace: typhoon-sf.snfc21.pbi.net 937004829 206.170.2.119 (Fri,
 10 Sep 1999 16:07:09 PDT)
Organization: SBC Internet Services
NNTP-Posting-Date: Fri, 10 Sep 1999 16:07:09 PDT
Newsgroups: comp.lang.ada
Date: 1999-09-10T00:00:00+00:00
List-Id: <comp.lang.ada>

> function Get_Top (Stack : Stack_Type) return Item_Type is
>   Control : Semaphore_Control (Stack.Semaphore'Access);
But the problem here is that the function Get_Top is in fact going
to modify its parameter - Stack will become unavailable to others,
at least for a while - and you want to modify the parameter to
a function.  This may be a good example of why functions should
allow "in out" parameters, but it's not a good example of why
"access constant" is desirable.