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 ) noexcept;
(since C++17)
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.


other - another future object to initialize with

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