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=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,21f683a2c713b788
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2002-10-26 18:08:14 PST
Newsgroups: comp.lang.ada
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!nntp.cs.ubc.ca!logbridge.uoregon.edu!arclight.uoregon.edu!news.tufts.edu!uunet!dca.uu.net!ash.uu.net!world!news
From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Boolean Operation on pointer (access)
User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2
Sender: news@world.std.com (Mr Usenet Himself)
Message-ID: <wccy98ksn8o.fsf@shell01.TheWorld.com>
Date: Sun, 27 Oct 2002 01:07:35 GMT
Content-Type: text/plain; charset=us-ascii
References: <mailman.1035674102.6610.comp.lang.ada@ada.eu.org>
NNTP-Posting-Host: shell01.theworld.com
Mime-Version: 1.0
Organization: The World Public Access UNIX, Brookline, MA
Xref: archiver1.google.com comp.lang.ada:30166
Date: 2002-10-27T01:07:35+00:00
List-Id: <comp.lang.ada>

"Dominic D'Apice" <dapiced@sympatico.ca> writes:

> if (x /= null) then  --the line where the compiler stop
...
> I got this error :
> 
> gerer_location.ada: Error: line 136 col 23 LRM:8.4(1), 
> Binary operator "/=" not directly visible, use clause or conversion
> might be needed 
> 
> The operation "/=" should be permit on pointer, then why i got this
> error ?

You want a "use type" clause on the pointer type.

Yes, "/=" is allowed on pointers, but this operator is implicitly
declared at a certain place in the program, and you need to make it
directly visible in order to call it.

- Bob