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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; If T is a final class (that is, a class declared with the final specifier), provides the member constant value equal true. For any other type, value is false. If T is a class type, T shall be a complete type; otherwise, the be- havior is undefined. The behavior of a program that adds specializations for is_final or is_final_v (since C++17) 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 Final classes cannot be used as base classes. A union can be marked final (and std::is_final will detect that), even though unions cannot be used as bases in any case. Feature-test macro: __cpp_lib_is_final Example // Run this code #include <iostream> #include <type_traits> class A {}; class B final {}; int main() { std::cout << std::boolalpha << std::is_final<A>::value << '\n' << std::is_final<B>::value << '\n'; } Output: false true 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 2022.07.31 std::is_final(3)
NAME | Synopsis | Template parameters | Member constants | Member functions | Member types | Notes | Example | Output: | See also
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