std::is_enum – cppreference.com

Original:

If T is an enumeration type, provides the member constant value equal true. For any other type, value is false.

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#include <iostream>
#include <type_traits>

class A {};

enum E {};

enum class Ec : int {};

int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_enum<A>::value << '\n';
    std::cout << std::is_enum<E>::value << '\n';
    std::cout << std::is_enum<Ec>::value << '\n';
    std::cout << std::is_enum<int>::value << '\n';
}