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:
template< class T > inline constexpr bool is_error_code_enum_v = is_error_code_enum<T>::value; | (since C++17) |
| value
[static] | true if T is an error code enum, false otherwise (public static member constant) |
| operator bool | converts the object to bool, returns value (public member function) |
| operator()
(C++14) | returns value (public member function) |
| Type | Definition |
|---|---|
value_type | bool |
type | std::integral_constant<bool, value> |
|
(C++11) | identifies an enumeration as an std::error_condition (class template) |
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