Base class instance in inheritance

Question

Hope I'm not asking something that has been already answered in here.

If my class B inherits from class A, does new B() create two instances in heap where B instance contains pointer to A instance, or there will be created only one instance of B including A members?

Answer 1

它将创建一个B实例，而B也是A.

Answer 2

From Microsoft Inheritance article :

This is how an object is represented in memory, given the Class Publication directly inherits the class Object.

So a inherited class is an object that contains all information about itself but also about its base class.

Answer 3

如果我理解你的问题，它将创建B实例（因为继承）已经包含A成员

Answer 4

It creates one instance and you can access all the members of both A and B on that instance. As stated A is of type B as well. I imagine that in the low level code there probably exists a pointer to A.