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std::is_final(3) C++ Standard Libary std::is_final(3) NAME std::is_final - std::is_final Synopsis Defined in header <type_traits> template< class T > (since C++14) struct is_final; std::is_final is a UnaryTypeTrait. If T is a final class, provides the member constant value equal true. For any other type, value is false. If T is an incomplete class type, the behavior is undefined. If the program adds specializations for std::is_final or std::is_final_v (since C++17), the behavior is undefined. Template parameters T - a type to check Helper variable template template< class T > (since C++17) inline constexpr bool is_final_v = is_final<T>::value; Inherited from std::integral_constant Member constants value true if T is a final class 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> Notes std::is_final is introduced by the resolution of LWG issue 2112. A union can be declared final (and std::is_final will detect that), even though unions cannot be used as bases in any case. Feature-test macro Value Std Feature __cpp_lib_is_final 201402L (C++14) std::is_final Example // Run this code #include <type_traits> class A {}; static_assert(std::is_final_v<A> == false); class B final {}; static_assert(std::is_final_v<B> == true); union U final { int x; double d; }; static_assert(std::is_final_v<U> == true); int main() { } See also is_class checks if a type is a non-union class type (C++11) (class template) is_polymorphic checks if a type is a polymorphic class type (C++11) (class template) http://cppreference.com 2024.06.10 std::is_final(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Notes | Example | See also
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