std::is_base_of

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.

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

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