std::is_error_code_enum - cppreference.com
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template< class T > struct is_error_code_enum; |
(since C++11) | |
If T is an error code enumeration (such as std::io_errc and std::future_errc), this template provides the member constant value equal true. For any other type, value is false.
This template may be specialized for a program-defined type to indicate that the type is eligible for std::error_code implicit conversion.
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
true if T is an error code enum, false otherwise (public static member constant) |
Member functions
converts the object to bool, returns value (public member function) | |
returns value (public member function) |
Member types
| Type | Definition |
value_type
|
bool
|
type
|
std::integral_constant<bool, value>
|
#include <ios> #include <system_error> static_assert(std::is_error_code_enum_v<decltype(std::io_errc::stream)>); static_assert(!std::is_error_code_enum_v<std::error_category>); int main() {}