std::is_error_code_enum

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

If T is an error code enumeration, this template provides the member constant value equal true. For any other type, value is false.

This template may be specialized for a user-defined type to indicate that the type is eligible for std::error_code and std::error_condition automatic conversions.

The following classes of the standard library are an error code enum:

std::io_errc
std::future_errc.

Helper variable template

template< class T >
constexpr bool is_error_code_enum_v = is_error_code_enum<T>::value;

(since C++17)

Inherited from std::integral_constant

Member constants

value

[static]

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

Member functions

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

Member types

Type	Definition
`value_type`	`bool`
`type`	`std::integral_constant<bool, value>`

is_error_condition_enum (C++11)	identifies an enumeration as an `std::error_condition` (class template)
std::experimental::is_error_code_enum_v (library fundamentals TS)	variable template alias of `std::is_error_code_enum::value` (variable template)