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

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std::packaged_task
~packaged_task ( ) ;

共有状態を放棄し、格納されたタスクオブジェクトを破棄します。

std::promise::~promise と同様に、共有状態が準備完了になる前に破棄された場合、 std::future_error 例外がエラーコード std::future_errc::broken_promise と共に保存されます。

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