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Showing content from https://cplusplus.com/reference/system_error/is_error_code_enum/ below:

class

<system_error>

std::is_error_code_enum 
template <class T>struct is_error_code_enum : public false_type {};

error_code enum flag


This is a traits class to identify whether a particular type is an error code enum type, and thus can be used to construct or assign values to objects of type error_code.

The standard header only provides the default definition, which simply inherits from false_type. But it should be specialized as inheriting from true_type to enable the construction of error_code object from error code enum types. The standard error condition types io_errc and future_errc inherit true_type.



Template parameters
T
A type.

Member types Inherited from integral_constant (is_false and is_true are typedefs of integral_constant instantiations):
member type definition value_type bool type either true_type or false_type
Member constants Inherited from integral_constant (is_false and is_true are typedefs of integral_constant instantiations):
member constant definition value either true or false
Member functions Inherited from integral_constant (is_false and is_true are typedefs of integral_constant instantiations):
operator bool
Returns value (public member function)

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