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std::is_error_code_enum

STD：：是[医]误差[医]代码[医]枚举

Defined in header ​​
template< class T > struct is_error_code_enum;​(since C++11)

如果T是错误代码枚举，此模板提供成员常量。value平等true.对于任何其他类型，value是false...

此模板可专门用于用户定义的类型，以指示该类型符合下列条件：std::error_code和std::error_condition自动转换

标准库的下列类是错误代码枚举：

  • std::io_errc

  • std::future_errc...

辅助变量模板

template< class T > inline constexpr bool is_error_code_enum_v = is_error_code_enum::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is an error code enum, false otherwise (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

另见

is_error_condition_enum (C++11)identifies an enumeration as an std::error_condition (class template)

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