std::is_enum
Defined in header <type_traits>
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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) |