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std:: is_error_code_enum <std::future_errc>

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std::future_errc
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is_error_code_enum
定义于头文件 <future>
template <>
struct is_error_code_enum < std:: future_errc > : std:: true_type ;
(C++11 起)

指定 std::future_errc 为错误代码枚举类型。这使得 std::error_code 能够进行自动转换。

参见

(C++11)
标识类为 error_code 枚举类型
(类模板)