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std::future<T>:: operator=

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

別のfutureオブジェクトの内容を割り当てます。

1) 共有状態を解放し、 other の内容を * this にムーブ代入する。代入後、 other. valid ( ) == false となり、 this - > valid ( ) は代入前の other. valid ( ) と同じ値を返す。
2) std::future は CopyAssignable ではありません。

パラメータ

その他 - 状態を * this に転送する std::future

戻り値

* this