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std::future<T>::future

future() noexcept;	(1)	(since C++11)
future( future&& other ) noexcept;	(2)	(since C++11)
future( const future& other ) = delete;	(3)	(since C++11)

Constructs a std::future object.

1) Default constructor. Constructs a std::future with no shared state. After construction, valid() == false.

2) Move constructor. Constructs a std::future with the shared state of other using move semantics. After construction, other.valid() == false.

3) std::future is not CopyConstructible.

other - another std::future to acquire shared state from

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