FreeBSD Manual Pages
std::is_enum(3) C++ Standard Libary std::is_enum(3) NAME std::is_enum - std::is_enum Synopsis Defined in header <type_traits> template< class T > (since C++11) struct is_enum; std::is_enum is a UnaryTypeTrait. Checks whether T is an enumeration type. Provides the member con- stant value which is equal to true, if T is an enumeration type. Otherwise, value is equal to false. If the program adds specializations for std::is_enum or std::is_enum_v, the behavior is undefined. 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 [static] (public static member constant) Member functions operator bool converts the object to bool, returns value (public member function) operator() returns value (C++14) (public member function) Member types Type Definition value_type bool type std::integral_constant<bool, value> Example // Run this code #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 is_integral checks if a type is an integral type (C++11) (class template) is_arithmetic checks if a type is an arithmetic type (C++11) (class template) is_scalar checks if a type is a scalar type (C++11) (class template) is_scoped_enum checks if a type is a scoped enumeration type (C++23) (class template) http://cppreference.com 2024.06.10 std::is_enum(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Example | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::is_enum&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>