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.Parameters
| other | - |  another std::future to acquire shared state from  | 
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