Kyle Alons wrote:

...

I wrote such a pointer several years ago:

http://lists.boost.org/MailArchives/boost/msg21930.php http://groups.yahoo.com/group/boost/message/15313 http://groups.yahoo.com/group/boost/files/impl_ptr/impl_ptr.html

but I never proposed it for Boost.

The reason that I didn't propose it is that I don't use it. :-)

Is the source code for this still available anywhere? I get 'document not found' for the links on http://groups.yahoo.com/group/boost/files/impl_ptr/impl_ptr.html. Thanks.

It's there: http://groups.yahoo.com/group/boost/files/impl_ptr/