std::is_base_of
From cppreference.com
| Defined in header <type_traits>
|
||
| template< class Base, class Derived > struct is_base_of; |
(since C++11) | |
If Derived is derived from Base or if both are the same non-union class, provides the member constant value equal to true. Otherwise value is false.
Requires that Derived is a complete type if it is not the same type as Base and if both Base and Derived are class types.
Contents |
Inherited from std::integral_constant
Member constants
| value [static] |
true if Derived is derived from Base , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
Member types
| Type | Definition |
value_type
|
bool
|
type
|
std::integral_constant<bool, value> |
[edit] Example
Run this code
#include <iostream> #include <type_traits> class A {}; class B : A {}; class C {}; int main() { std::cout << std::boolalpha; std::cout << "a2b: " << std::is_base_of<A, B>::value << '\n'; std::cout << "b2a: " << std::is_base_of<B, A>::value << '\n'; std::cout << "c2b: " << std::is_base_of<C, B>::value << '\n'; }
Output:
a2b: true b2a: false c2b: false