std::future<T>:: operator=

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

Assigns the contents of another future object.

1) Releases any shared state and move-assigns the contents of other to * this . After the assignment, other. valid ( ) == false and this - > valid ( ) will yield the same value as other. valid ( ) before the assignment.
2) std::future is not CopyAssignable .

Parameters

other - a std::future that will transfer state to * this

Return value

* this

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