Defined in header <system_error> | ||
---|---|---|
template< class T > struct is_error_condition_enum; | (since C++11) |
If T
is an error condition enum, 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 class of the standard library is an error condition enum: std::errc
.
Helper variable template
template< class T > 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
(C++11) | identifies a class as an error_code enumeration (class template) |
std::experimental::is_error_condition_enum_v
(library fundamentals TS) | variable template alias of std::is_error_condition_enum::value (variable template) |
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