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    std::packaged_task<R(Args...)>:: valid

    From ja.cppreference.net
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    std::packaged_task
    bool valid ( ) const noexcept ;
    		(C++11以降)

    * this が共有状態を持っているかどうかをチェックします。

    パラメータ

    (なし)

    戻り値

    true が * this が共有状態を持つ場合、 false がそれ以外の場合。