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From: stt@houdini.camb.inmet.com (Tucker Taft)
Subject: Re: Equality operator overloading in ADA 83
Date: 1997/05/07
Message-ID: <E9sM46.D8p.0.-s@inmet.camb.inmet.com>#1/1
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Organization: Intermetrics, Inc.
Newsgroups: comp.lang.ada
Date: 1997-05-07T00:00:00+00:00
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Matthew Heaney (mheaney@ni.net) wrote:

: ...
: One thing he mentioned that didn't go in that probably should have (I think
: that's what he said...) is 

: procedure P (O : access constant T);

: I've actually had a use for this kind of thing.  It would allow me to take
: the 'Access of an tagged parameter of mode in:

: procedure Q (O : in T) is
: begin
:    P (O'Access);
: ...

: As it stands now I can't do that, because the object passed to "access T"
: has to be mode in out.  Bummer.

You can declare a named access-to-constant type, and use that instead
of an anonymous type.  E.g.:

    type acc_to_con is access constant T;
   ...
    procedure P(O : acc_to_con);

You will need to use 'Unchecked_Access to call it, though that is
not exactly a huge crime in this case (IMHO).

: --------------------------------------------------------------------
: Matthew Heaney
: Software Development Consultant
: <mailto:matthew_heaney@acm.org>
: (818) 985-1271

-Tucker Taft   stt@inmet.com   http://www.inmet.com/~stt/
Intermetrics, Inc.  Burlington, MA  USA