std::shared_future::shared_future(3)

NAME
std::shared_future::shared_future - std::shared_future::shared_future

Synopsis
   shared_future() noexcept; (1) (since C++11)
   shared_future( const shared_future& other ); (since C++11)
                        (until C++17)
   shared_future( const shared_future& other ) (2) (since C++17)
   noexcept;
   shared_future( std::future<T>&& other ) noexcept; (3) (since C++11)
   shared_future( shared_future&& other ) noexcept; (4) (since C++11)
   Constructs a new shared_future.
   1) Default constructor. Constructs an empty shared future, that doesn't refer to a
   shared state, that is valid() == false.
   2) Constructs a shared future that refers to the same shared state, if any, as
   other.
   3,4) Transfers the shared state held by other to *this. After the construction,
   other.valid() == false, and this->valid() returns the same value as other.valid()
   would have returned before the construction.

Parameters
   other - another future object to initialize with