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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../ranges/../types/is_final.html below:

std::is_final - cppreference.com

template< class T > struct is_final;

(since C++14)

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.

[edit] Template parameters [edit] Helper variable template

template< class T > constexpr bool is_final_v = is_final<T>::value;

(since C++17) Inherited from std::integral_constant Member constants true if T is a final class type, false otherwise
(public static member constant) Member functions converts the object to bool, returns value
(public member function) returns value
(public member function) Member types [edit] 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.

[edit] Example

#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()
{
}

[edit] See also checks if a type is a non-union class type
(class template) [edit] checks if a type is a polymorphic class type
(class template) [edit]

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