std::is_base_of – cppreference.com

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definiert in Header `<type_traits>`

`template< class B, class D > struct is_base_of;`		(seit C++11)

Wenn D von B oder abgeleitet wird beide das gleiche nicht gewerkschaftlich Klasse sind, bietet das Mitglied konstanten value gleich true. Ansonsten value ist false .

Original:

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.

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Inherited from std::integral_constant

Member constants


	`true` wenn `D` is derived from `B` , `false` anders Original: `true` if `D` is derived from `B` , `false` otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten)

Member functions


	wandelt das Objekt `bool`, gibt `value` Original: converts the object to `bool`, returns `value` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)

Member types


Type Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`bool`

`type`	`std::integral_constant<bool, value>`

Beispiel

#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