std:: is_error_condition_enum

From cppreference.com
Utilities library
General utilities
Relational operators (deprecated in C++20)
Defined in header <system_error>
template < class T >
struct is_error_condition_enum ;
(since C++11)

If T is an error condition enum (such as std::errc ), this template provides the member constant value equal true . For any other type, value is false .

This template may be specialized for a program-defined type to indicate that the type is eligible for std::error_condition implicit conversions.

Helper variable template

template < class T >

inline constexpr bool is_error_condition_enum_v =

is_error_condition_enum < T > :: value ;
(since C++17)

Inherited from std:: integral_constant

Member constants

value
[static]
true if T is an error condition 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 >

See also

identifies a class as an error_code enumeration
(class template)