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      std::experimental::future<T>::operator=

      From cppreference.com
      <cpp‎ |experimental‎ |future
       
       
       
       
       
      std::experimental::future<T>& operator=(std::experimental::future<T>&& other)noexcept;
      		 (1)
      std::experimental::future<T>& operator=(conststd::experimental::future<T>& other)= delete;
      		 (2)

      Assigns the contents of another future object.

      1) Releases any shared state and move-assigns the contents ofother to*this. After the assignment,other.valid()==false andthis->valid() will yield the same value asother.valid() before the assignment.
      2)std::experimental::future is notCopyAssignable.

      [edit]Parameters

      other - astd::experimental::future that will transfer state to*this

      [edit]Return value

      *this

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