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.
Template parameters
| T | - | a type to check |
Helper variable template
| template< class T > inline constexpr bool is_enum_v = is_enum<T>::value; |
(since C++17) | |
Inherited from std::integral_constant
Member constants
| value [static] |
true if T is 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> |
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
See also
| (C++11) |
checks if a type is an integral type (class template) |
| (C++11) |
checks if a type is an arithmetic type (class template) |