std::is_final
From cppreference.com
Defined in header
<type_traits>
|
||
template< class T >
struct is_final; |
(since C++14) | |
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.
Contents |
Inherited from std::integral_constant
Member constants
value
[static]
|
true if T is a final class 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> |
[edit] 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.
[edit] 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
[edit] See also
(C++11)
|
checks if a type is a class type (but not union type) (class template) |
(C++11)
|
checks if a type is polymorphic class type (class template) |
(library fundamentals TS)
|
variable template alias of std::is_final::value (variable template) |