std::is_enum
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header  <type_traits> | ||
| template< class T > struct is_enum; | (since C++11) | |
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.
| Contents | 
[edit] Template parameters
| T | - | a type to check | 
[edit] Helper variable template
| template< class T > constexpr bool is_enum_v = is_enum<T>::value; | (since C++17) | |
Inherited from std::integral_constant
Member constants
| value [static] | true if Tis an enumeration type , false otherwise(public static member constant) | 
Member functions
| operator bool | converts the object to bool, returns value(public member function) | 
| operator() (C++14) | returns value(public member function) | 
Member types
| Type | Definition | 
| value_type | bool | 
| type | std::integral_constant<bool, value> | 
[edit] Example
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'; }
Output:
false true true false
[edit] See also
| (C++11) | checks if a type is void (class template) | 
| (C++11) | checks if a type is a pointer type (class template) | 
| (C++11) | checks if a type is arithmetic type (class template) | 
| (library fundamentals TS) | variable template alias of std::is_enum::value(variable template) | 


