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From: "Martin Dowie" <martin.dowie@baesystems.com>
Newsgroups: comp.lang.ada
References: <1126617980.932226.320710@g43g2000cwa.googlegroups.com>
Subject: Re: generics in Ada 83
Date: Tue, 13 Sep 2005 14:50:28 +0100
Organization: BAE SYSTEMS
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Date: 2005-09-13T13:51:25+00:00
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REH wrote:
> Is there a way to define a default for the with'd procedure in the
> following example in Ada 83:
>
> generic
>     type X is private;
>     with procedure Y(Z : in X);
> package Foo;
>
> I want to define a default for Y, but how can I without knowing X?
>
> I have a generic package that has several with'd procedures, but
> depending on what services the package provides are use, only a few of
> the procedures may need to be defined.  I'd like to just default the
> unused ones to stubs.

Same as Ada95:

generic
   type X is private;
   with procedure Y (Z : X) is <>;
package Foo is
end Foo;

Or do you mean you want the compiler to magically insert a 'null' procedure
if there isn't a matching procedure Y for whatever type X happens to be? If
that's the case you can't do that. There has to be some procedure (even one
that's only 'begin null end;') for each type.

Cheers

-- Martin