Issue 1359:  Ada Language Mapping: Section 23.5.5, Mapping for Interface (ada-rtf)
Source:  (, )
Nature:  Uncategorized Issue
Severity: 
Summary: Summary: Ada Language Mapping:  Section 23.5.5, “Mapping for Interfaces”
 
 **The following text is added to the Ada language mapping within section
 23.5.5 at the end of the subsection titled, “Narrowing Object
 References”.**
 
 Narrowing an object reference can require a remote invocation (to either
 the target object or to an Interface Repository) to verify the
 relationship between the actual object and the desired narrow
 interface.  For cases where the application programmer wishes to avoid
 the possibility of this remote invocation, conforming implementations
 must provide a primitive subprogram in each interface package to perform
 an unchecked narrow operation.
 Each interface mapping shall include a function with specification:
 
 function Unchecked_To_Ref(The_Ref : in CORBA.Object.Ref’CLASS) return
 Ref;
 
 Regardless of whether or not The_Ref is known to support the desired
 interface, the provided implementation returns a narrowed reference.
 
 

Resolution: 
Revised Text: 
Actions taken:
May 15, 1998: received issue
December 2, 2002: closed issue
Discussion: 

End of Annotations:=====
Return-Path: <goldberg@inprise.com>
Date: Wed, 13 May 1998 19:03:23 -0700
From: Jon Goldberg <goldberg@corp.inprise.com>
To: ada-rtf@omg.org, issues@omg.org
Subject: Mapping of Unchecked Narrow

Hi-

This is mostly a warning of pending IDL-to-Ada work
that will be needed to support a change due to CORBA Messaging.
Although Messaging has not been adopted at this time (therefore
no document number is provided here), I didn't want to lose
this issue or the attached proposed solution.

take care,
 Jon

============================================================
The CORBA Messaging specification is in the process
of adding an unchecked narrow operation to the 
IDL mapping for interfaces for those languages that
currently have a mapping for typesafe "narrow".  The
Ada language mapping will need to be updated to 
support this new operation.

Here is a first stab at that update, but my Ada
is a bit rusty:

Ada Language Mapping:  Section 23.5.5 ,

**The following text is added to the Ada language mapping within
section
23.5.5 at the end of the subsection titled, Referencse.**

Narrowing an object reference can require a remote invocation (to
either
the target object or to an Interface Repository) to verify the
relationship between the actual object and the desired narrow
interface.  For cases where the application programmer wishes to avoid
the possibility of this remote invocation, conforming implementations
must provide a primitive subprogram in each interface package to
perform
an unchecked narrow operation.
Each interface mapping shall include a function with specification:

function Unchecked_To_Ref(The_Ref : in Ref;

Regardless of whether or not The_Ref is known to support the desired
interface, the provided implementation returns a narrowed reference.



CORBA.Object.Ref