std::is_enum (3) - Linux Manuals

std::is_enum: std::is_enum


std::is_enum - std::is_enum


Defined in header <type_traits>
template< class T > (since C++11)
struct is_enum;

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.

Template parameters

T - a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_enum_v = is_enum<T>::value;

Inherited from std::integral_constant

Member constants

value true if T is an enumeration type , false otherwise
         (public static member constant)

Member functions

              converts the object to bool, returns value
operator bool (public member function)

operator() returns value
              (public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>


// Run this code

  #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';



See also

is_integral checks if a type is an integral type
              (class template)

is_arithmetic checks if a type is an arithmetic type
              (class template)