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std::promise<R>:: operator=

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

Asigna los contenidos.

1) Operador de asignación de movimiento. Primero, abandona el estado compartido (como en ~promise() ), luego asigna el estado compartido de other como si ejecutara std:: promise ( std :: move ( other ) ) . swap ( * this ) .
2) promise no es asignable por copia.

Parámetros

otro - otra promise de la cual adquirir el estado

Valor de retorno

* this