[Bug c++/40486] [c++0x] rvalue-references no longer bind to lvalues

["jwakely dot gcc at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #9 from jwakely dot gcc at gmail dot com  2009-06-23 18:40 -------
The library pieces of Doug's patch that still need to be applied are:

        * include/std/tuple (_Tuple_impl): Use lvalue references when
        explicitly specifying the template argument to std::move.

        * include/std/iosfwd (operator<<): Provide a forwarding operator<<
        that accepts rvalue streams.
        (operator>>): Ditto.

        * include/bits/stl_iterator.h (move_iterator::operator*):
        Explicitly std::move the result, to convert it to an rvalue
        reference.

        * include/bits/stl_move.h (forward): Forward lvalues (which may
        end up being turned into rvalues).
        (move): Explicitly static_cast to an rvalue.

        * testsuite/27_io/rvalue_streams.cc: New; test the use of rvalue
        streams. Works except for the fact that we can't call str() on the
        result. (This is an existing issue).

I think the move_iterator and tuple changes would be OK to apply now but the
stream parts have a FIXME and as discussed, the definition of std::move is
undecided.  I'll come back to this soon.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40486