std::is_error_code_enum (3) - Linux Man Pages

std::is_error_code_enum: std::is_error_code_enum

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


Inherited from std::integral_constant

Member constants


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

Member functions


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


operator() returns value
              (public member function)
(C++14)

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
                        (class template)
(C++11)