std::experimental::packaged_task (concurrency TS)
From cppreference.com
                    
                                        
                    < cpp | experimental | concurrency
                    
                                                            
                    This page is about the modified version of std::packaged_task provided by the concurrency TS supporting the std::future improvements made by that TS. For the version of packaged_task with type-erased allocator support provided by the Library Fundamentals TSes, see std::experimental::fundamentals_v2::packaged_task.
| Defined in header  <experimental/future> | ||
| template< class > class packaged_task; //not defined | (1) | (concurrency TS) | 
| template< class R, class ...Args >  class packaged_task<R(Args...)>; | (2) | (concurrency TS) | 
std::experimental::concurrency_v1::packaged_task is a modified version of std::packaged_task provided by the concurrency TS that works with std::experimental::future.
The only change from std::packaged_task is that the get_future() member function returns a std::experimental::future<R>.


