std::is_enum

template< class T >
struct is_enum;

std::is_enum is a UnaryTypeTrait.

Checks whether T is an enumeration type. Provides the member constant value which is equal to true, if T is an enumeration type. Otherwise, value is equal to false.

The behavior of a program that adds specializations for std::is_enum or std::is_enum_v is undefined.

Template parameters

Helper variable template

template< class T >
inline constexpr bool is_enum_v = is_enum<T>::value;

Example

#include <type_traits>
 
struct A { enum E {}; };
static_assert(std::is_enum_v<A> == false);
static_assert(std::is_enum_v<A::E> == true);
 
enum E {};
static_assert(std::is_enum_v<E> == true);
 
enum class Ec : int {};
static_assert(std::is_enum_v<Ec> == true);
 
static_assert(std::is_enum_v<int> == false);
 
int main() {}

See also