Issue 3111: Abstract interface and DSI issue with C++ (cxx_revision)
Source: Floorboard Software (Mr. Jonathan Biggar, jon(at)floorboard.com)
Nature: Uncategorized Issue
Severity: 
Summary: There doens't appear to be any portable way to implement an object that
inherits from an abstract interface using the DSI in C++ without compile
time knowledge of the abstract interface.  The basic problem is that I
can create an object reference from a POA, but there is no way to
convert the reference into an abstract interface reference so that I can
send it out on the wire.

We need some mechanism to coerce an object reference into an abstract
interface reference (with a runtime check) to make this work.

Resolution: 
Revised Text: 
Actions taken:
December 10, 1999: received issue
Discussion: 
deferred in June 2011 to the next RTF
End of Annotations:=====
Sender: jbiggar@floorboard.com
Message-ID: <3851816B.717A760F@floorboard.com>
Date: Fri, 10 Dec 1999 14:40:43 -0800
From: Jonathan Biggar <jon@floorboard.com>
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Subject: Abstract interface and DSI issue with C++
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There doens't appear to be any portable way to implement an object
that
inherits from an abstract interface using the DSI in C++ without
compile
time knowledge of the abstract interface.  The basic problem is that I
can create an object reference from a POA, but there is no way to
convert the reference into an abstract interface reference so that I
can
send it out on the wire.

We need some mechanism to coerce an object reference into an abstract
interface reference (with a runtime check) to make this work.

-- 
Jon Biggar
Floorboard Software
jon@floorboard.com
jon@biggar.org
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Date: Mon, 13 Dec 1999 09:10:08 -0500
To: Jonathan Biggar <jon@floorboard.com>
From: Steve Vinoski <vinoski@iona.com>
Subject: Re: Abstract interface and DSI issue with C++
Cc: cxx_revision@omg.org
In-Reply-To: <3851816B.717A760F@floorboard.com>
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At 02:40 PM 12/10/99 -0800, Jonathan Biggar wrote:
>There doens't appear to be any portable way to implement an object
that
>inherits from an abstract interface using the DSI in C++ without
compile
>time knowledge of the abstract interface.  The basic problem is that
I
>can create an object reference from a POA, but there is no way to
>convert the reference into an abstract interface reference so that I
can
>send it out on the wire.

This doesn't surprise me in the least. There's lots of stuff that the
OBV
changes introduced that doesn't work with the DSI. I brought this up
when
the submitters were working on the final OBV submission, and one of
the
major proponents of abstract interfaces (who shall remain nameless) --
and
I'm not making this up -- said, "What is the DSI?"

--steve