From: Georg Bauhaus <rm.tsoh.plus-bug.bauhaus@maps.futureapps.de>
Subject: Re: default formal parameters in generic declarations
Date: Fri, 07 Mar 2008 11:51:49 +0100
Date: 2008-03-07T11:51:50+01:00 [thread overview]
Message-ID: <47d11e46$0$25511$9b4e6d93@newsspool1.arcor-online.net> (raw)
In-Reply-To: <87lk4vv5kg.fsf@ludovic-brenta.org>
Ludovic Brenta wrote:
> Eric Hughes writes:
>> On Mar 6, 2:32 am, Georg Bauhaus wrote:
>>> By way of speculation, can nesting, to the extent it is absent from C++,
>>> lead to at least a partial solution of this problem?
>> [example deleted]
>> I note here that your example uses a formal
>> default subprogram.
> The actual subprogram may very well be nested in a package that
> declares all the necessary types and variables to keep the state.
Yes, and in C, too, a local static struct might keep state.
But actually, the function in the example,
generic
Additional_Operations_Object: Functionality_Interface'Class :=
Add_Ops_Factory.New_Object;
package Foo is
type T is ...
is used only to provide a default object of a suitable abstract
type (which could be Any'Class) on instantiation. This object
can be overridden, passed downwards to other instantiations,
"intercepted" by different Functionality_Interface'Class objects...
But, as Eric has explained, going along this path does not
yet lead to complete solution.
next prev parent reply other threads:[~2008-03-07 10:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-02 17:21 default formal parameters in generic declarations Eric Hughes
2008-03-02 17:42 ` Robert A Duff
2008-03-02 19:40 ` Eric Hughes
2008-03-03 9:17 ` Dmitry A. Kazakov
2008-03-03 11:15 ` Georg Bauhaus
2008-03-03 13:56 ` Dmitry A. Kazakov
2008-03-04 16:15 ` Eric Hughes
2008-03-04 3:43 ` Randy Brukardt
2008-03-04 16:51 ` Eric Hughes
2008-03-04 18:43 ` Randy Brukardt
2008-03-05 21:08 ` Eric Hughes
2008-03-06 9:32 ` Georg Bauhaus
2008-03-06 18:05 ` Eric Hughes
2008-03-06 22:41 ` Ludovic Brenta
2008-03-07 10:51 ` Georg Bauhaus [this message]
2008-03-07 20:09 ` Eric Hughes
2008-03-03 12:42 ` Stephen Leake
2008-03-04 13:50 ` Dr. Adrian Wrigley
2008-03-04 16:56 ` Eric Hughes
2008-03-04 16:44 ` Eric Hughes
2008-03-05 13:11 ` Stephen Leake
2008-03-05 21:41 ` Eric Hughes
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