Re: [boost] [move semantics] Containers supporting movable-only types

From: Daniel James (daniel_james_at_[hidden])
Date: 2008-06-23 18:44:26

On 23/06/2008, Daniel James <daniel_james_at_[hidden]> wrote:
> 2008/6/23 David Abrahams <dave_at_[hidden]>:
> >
>  > I have a hunch that it would be really easy to add support for move-only
>  > types, though.  Do you see any specific obstacles?

I had a quick try at implementing move-only types. It looks like you're right:

http://svn.boost.org/trac/boost/changeset/46631

y.hpp contains the move-only type. The code might look familiar.

It mostly works. I've found two problems so far. Firstly,
is_convertible didn't work for the type, but I managed to work around
that (I'll probably need to refine the change to is_movable).
Secondly, it doesn't seem to be able to pass rvalues by reference. I'm
not sure how to get round that, I'll have to learn more about the
trick used to implement it.

Daniel