Difference between revisions of "cpp/error/error condition/is error condition enum"
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< cpp | error | error condition
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The following class of the standard library is an error condition enum: {{lc|std::errc}}. | The following class of the standard library is an error condition enum: {{lc|std::errc}}. | ||
| + | |||
| + | === Helper variable template === | ||
| + | {{ddcl | since=c++17 | 1= | ||
| + | template< class T > | ||
| + | constexpr bool is_error_condition_enum_v = is_error_condition_enum<T>::value; | ||
| + | }} | ||
{{cpp/types/integral_constant/inherit | {{tt|T}} is an error condition enum}} | {{cpp/types/integral_constant/inherit | {{tt|T}} is an error condition enum}} | ||
Revision as of 18:57, 26 October 2015
| 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_code and 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 > 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) |
| (library fundamentals TS) |
variable template alias of std::is_error_condition_enum::value (variable template) |
