Re: hunting snarks

[Tucker Taft <stt@averstar.com>]

Robert A Duff wrote:
> 
> Stephen Leake <Stephen.Leake@gsfc.nasa.gov> writes:
> 
> > Anyway, this problem has been mentioned here before. I'm considering
> > hacking into GNAT to provide a fix, probably in the form of a pragma
> > Overrides. But first, I'd like to check if anyone else is working on a
> > solution, or has a proposal for a syntax for a solution.
> 
> Somebody proposed a pragma along those lines to the ARG recently.
> Check out the Ada Issues.

As mentioned in another reply, the relevant AI is:
    http://www.ada-auth.org/cgi-bin-acats/cvsweb.cgi/AIs/AI-00218.DOC?rev=1.3

The basic idea is a pragma Overrides that means a subprogram
*must* be overriding something, and a configuration pragma Explicit_Overriding
that means that any subprogram without a pragma Overrides must *not*
be overriding something.  For special cases involving generics which
declare a type derived from a formal type, there is also a pragma
Might_Override which overrules Explicit_Overriding, to indicate that the
given subprogram might or might not override..

> 
> - Bob

-- 
-Tucker Taft   stt@averstar.com   http://www.averstar.com/~stt/
Technical Director, Distributed IT Solutions  (www.averstar.com/tools)
AverStar (formerly Intermetrics, Inc.)   Burlington, MA  USA