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std::promise<R>:: operator=

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

Assigns the contents.

1) Move assignment operator. First, abandons the shared state (as in ~promise() ), then assigns the shared state of other as if by executing std:: promise ( std :: move ( other ) ) . swap ( * this ) .
2) promise is not copy-assignable.

Parameters

other - another promise to acquire the state from

Return value

* this