From mboxrd@z Thu Jan  1 00:00:00 1970
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From: adam@irvine.com (Adam Beneschan)
Subject: Re: Puzzling question
Date: 1997/05/08
Message-ID: <5ktmck$lcp$1@krusty.irvine.com>#1/1
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References: <337209D7.4D25@aisf.com>
Organization: /z/news/newsctl/organization
Newsgroups: comp.lang.ada
Date: 1997-05-08T00:00:00+00:00
List-Id: <comp.lang.ada>


"Chris Sparks (Mr. Ada)" <sparks@AISF.COM> writes:
 
 >with System;
 >
 >package body T is
 >
 >  procedure R (V : in System.Address) is begin
 >
 >    null;
 >
 >  end R;
 >
 >  procedure S (U : out Rec_Type) is begin
 >
 >    U.A := 1;
 >    U.B := 2;
 >
 >    R (V => U.A'Address);  -- Why is this valid????????????????
 >
 >  end S;
 >
 >end T;

6.2(5) says "Reading the bounds and discriminants of the formal
parameter and of its subcomponents is allowed, but no other reading."

I don't know whether "reading" is defined explicitly in the Ada83 RM,
but I would suspect that taking the 'ADDRESS of a parameter is not
considered "reading".

                                -- Adam