Re: [Boost-users] Header ordering [was: Vector of Polymorphic Pointers]

From: David Abrahams (dave_at_[hidden])
Date: 2006-05-02 17:20:24

David Abrahams <dave_at_[hidden]> writes:

> "Robert Ramey" <ramey_at_[hidden]> writes:
>
>> This is explained in the docmentation under
>>
>> Reference/Special Considerations/Exporting Class Serialization
>>
>> Robert Ramey
>
> I have analyzed your issue and I believe there is a better way; one
> that avoids the header ordering requirement.  I have put together a
> small demonstration, which is enclosed.  This shows that we can
> instantiate a class template (instantiator) for the exported class and
> each archive that's been seen.
>
> Then the only challenge is causing that class template instantiation
> to actually instantiate executable code.  Fortunately, I've recently
> addressed that problem in changes to the serialization library.  The
> basics are in CVS at:
>
>   boost/boost/concept/detail/general.hpp
>   boost/boost/concept/detail/msvc.hpp
>   boost/boost/concept/detail/borland.hpp
>
> (Ignore the part that says BOOST_OLD_CONCEPT_SUPPORT), so we have the
> technology.  And if you use the function pointer technique of
> BOOST_CONCEPT_ASSERT(( ... )) in boost/boost/concept/assert.hpp you'll
> be able to use BOOST_CLASS_EXPORT on class template instances with
> multiple arguments.
>
>   BOOST_CLASS_EXPORT(foo<bar,baz>)  // an error, today.
>
> I hope all this is helpful.
>

Sorry, the attachment came with the wrong MIME type; I don't know if
that's a problem for anyone, but here it is again:



-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com