std::future_category

 

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在標頭檔案 <future> 中定義
const std::error_category& future_category() noexcept;		(C++11 起)

獲取與 future 和 promise 相關的錯誤的靜態錯誤類別物件的引用。該物件需要重寫虛擬函式 error_category::name()，以返回指向字串 "future" 的指標。它用於識別型別為 std::future_error 的異常中提供的錯誤程式碼。

引數

(無)

返回值

對靜態物件的引用，該靜態物件的執行時型別未指定，派生自 std::error_category。

參閱

future_errc (C++11)	標識 future 錯誤程式碼 (enum)
future_error (C++11)	報告與 future 或 promise 相關的錯誤 (class)
error_category (C++11)	錯誤類別的基類 (class)