I'm trying to use a packaged_task, and get an error on creation.

       template<typename R,typename F>
       struct task_object:
           task_base<R>
       {
           F f;
           task_object(F const& f_):   // << refers to look here
               f(f_)
           {}
#ifndef BOOST_NO_RVALUE_REFERENCES
           task_object(F&& f_):         // <<<< Error here
               f(f_)
           {}


E:\boost_1_49\boost/thread/future.hpp(1251): error C2535: 'boost::detail::task_object<R,F>::task_object(F)' : member function already defined or declared
         with
         [
             R=size_t,
             F=std::tr1::_Bind<size_t,size_t,std::tr1::_Bind1<std::tr1::_Callable_fun<size_t (__cdecl *const )(std::string &),false>,const char *>> &

         ]
         E:\boost_1_49\boost/thread/future.hpp(1247) : see declaration of 'boost::detail::task_object<R,F>::task_object'
         with
         [
             R=size_t,
             F=std::tr1::_Bind<size_t,size_t,std::tr1::_Bind1<std::tr1::_Callable_fun<size_t (__cdecl *const )(std::string &),false>,const char *>> &
         ]


So I'm thinking that VS10 (Microsoft Visual Studio 2010) has problems overloading the constructor with (T const&) and (T&&) ?  But shouldn't someone have noticed that long ago?