std::is_base_of
From Cppreference
| Defined in header <type_traits>
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| template< class B, class D >
struct is_base_of; |
(C++11 feature) | |
If D is derived from B or if both are the same non-union class, provides the member constant value equal to true. Otherwise value is false.
Contents |
Inherited from std::integral_constant
Member constants
| value | true if D is derived from B , 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
#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