Difference between revisions of "cpp/error/error condition/is error condition enum"
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Revision as of 01:04, 6 July 2018
| Defined in header <system_error>
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| 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_condition automatic conversions.
The following class of the standard library is an error condition enum: std::errc.
Contents |
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
| (C++11) |
identifies a class as an error_code enumeration (class template) |
