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std::promise<R>:: operator=

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

内容を割り当てます。

1) ムーブ代入演算子。まず、共有状態を破棄し（ ~promise() と同様）、その後 other の共有状態を、以下のように実行するかのように代入する： std:: promise ( std :: move ( other ) ) . swap ( * this ) 。
2) promise はコピー代入可能ではありません。

パラメータ

その他 - 別の promise から状態を取得する

戻り値

* this