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Showing content from https://en.cppreference.com/w/cpp/algorithm/../error/error_condition/is_error_condition_enum.html below:

std::is_error_condition_enum - cppreference.com

template< class T > struct is_error_condition_enum;

(since C++11)

If T is an error condition enum (such as std::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_condition implicit conversions.

[edit] Helper variable template template< class T > inline constexpr bool is_error_condition_enum_v = is_error_condition_enum<T>::value; (since C++17) Inherited from std::integral_constant Member constants true if T is an error condition 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 [edit] See also

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