Re: [orbitcpp-list] Re: cpp branch: CORBA_Object struct hidden?

[Michael Meeks <michael ximian com>]

Hi Richard,

On Wed, 2002-02-20 at 00:31, Richard Andrews wrote:
>  --- Murray Cumming <murrayc@t-online.de> wrote: 
> > 1. If a C++ class inherits from a struct, then it would make that
> > struct public to anybody who uses the C++ class.
> 
> What happens if you use private inheritance?

	Sigh - yes, if you use 'private' you can't poke at it; but to layout
the instance data of the object the C++ compiler hard wires the size of
the 'private' structure you inherit from making it exactly as ABI
private as having a public element ;-)

	Really - we do know what we're talking about, and it just can't be any
other way, you wouldn't be able to narrow from a CORBA_Object_struct to
a Foo_Object otherwise.

> My understanding (although I haven't used private inheritance for
> years) is that this should make the internal data storage of the
> OrbitCPP_Object the same as a CORBA_Object (so casting between them
> is possible), but the storage structure will not be publicly
> available to clients of OrbitCPP_Object.
> 
> Is this what you need?

	Sadly not,

		Michael.

-- 
 mmeeks@gnu.org  <><, Pseudo Engineer, itinerant idiot