NAME¶

std::is_error_code_enum - std::is_error_code_enum

Synopsis¶

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

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

Inherited from std::integral_constant

Member constants¶

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

Member functions¶

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

Member types¶

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

See also¶

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