[Boost-users] [Thread] Constructing a move-only object asyncronously

Subject: [Boost-users] [Thread] Constructing a move-only object asyncronously
From: Alexander Lamaison (awl03_at_[hidden])
Date: 2013-03-19 14:40:17

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;
}

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