Difference between revisions of "cpp/error/error code/is error code enum"
From cppreference.com
< cpp | error | error code
| Line 17: | Line 17: | ||
* {{c|std::future_errc}}. | * {{c|std::future_errc}}. | ||
| − | {{cpp/types/integral_constant/inherit | {{tt|T}} is an error | + | {{cpp/types/integral_constant/inherit | {{tt|T}} is an error code enum}}. |
Revision as of 07:53, 23 April 2013
Template:ddcl list begin <tr class="t-dsc-header">
<td>Defined in header
</td>
<system_error>
<td></td> <td></td> </tr> <tr class="t-dcl ">
<td >template< class T >
struct is_error_code_enum;
</td>
struct is_error_code_enum;
<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end
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:
Contents |
Inherited from std::integral_constant
Member constants
| value [static] |
true if T is an error code 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> |
