std::is_error_code_enum
From cppreference.com
< cpp | error | error code
| 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:
- std::io_errc
- std::future_errc.
Contents |
[edit] Helper variable template
| template< class T >
constexpr bool is_error_code_enum_v = is_error_code_enum<T>::value; |
(since C++17) | |
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> |
[edit] See also
| (C++11)
|
identifies an enumeration as an std::error_condition (class template) |
| (library fundamentals TS)
|
variable template alias of std::is_error_code_enum::value (variable template) |