I'm trying to create a move-only object asyncronously using Boost.Thread unique_future but I'm running into trouble: error C2248: 'A::A' : cannot access private member declared in class 'A' c:\users\awl03\documents\visual studio 2005\projects\boost_1_51_0\boost\thread\future.hpp 493 I've tried all sorts of ways to work around this but always end up with some variation or other of this error message. What am I doing wrong? The code is below. The setup is: Visual Studio 2005 Boost 1.51 Thanks, Alex #include <boost/noncopyable.hpp> #include <boost/move/move.hpp> #include <boost/thread/future.hpp> #include <boost/thread/thread.hpp> using namespace boost; class A : public noncopyable { BOOST_MOVABLE_BUT_NOT_COPYABLE(A) public: A(int i) {} A(BOOST_RV_REF(A) other) {} A& operator=(BOOST_RV_REF(A) other) {} }; A create_a() { return A(42); } unique_future<A> async_create_a() { packaged_task<A> task(create_a); unique_future<A> result = task.get_future(); thread(move(task)).detach(); return move(result); } int main() { A a = async_create_a().get(); return 0; } -- Swish - Easy SFTP for Windows Explorer (http://www.swish-sftp.org)