Object reading and writing overload in C++

Question

I know that the assignment operator can be overloaded. When writing to an object, the object's overload function is called.

Obj = 10; // Obj's assignment overload function called.

Is there a way to define a function to be called when an object is read?

int a = Obj;

In this case Obj's reading function would be called and the return value would be assigned to a.