Question

I found this exercise about C++ in a list and just couldn’t solve it. Here it is:
Let’s say we have the following instruction:

ObjA = ObjB; 

In which ObjA is an object of ClassA, and ObjB is an object of ClassB, this will run properly, if and only if there is:
A. A conversion function in ClassA
B. A conversion function in ClassB
C. A constructor in ClassA
D. A constructor in ClassB

There can be multiple correct answers.
My problem with this exercise is that they are both objects, and, theoretically, you can’t change the instance inside an object – and that is what I think the ‘=’ would do there. Since there can be multiple correct answers, I thought, therefore, that none were correct. But I’m not sure.

Answer 1

This will run correctly if any of these is true:

1. There is an assignment operator in ClassA which takes an argument of type ClassB
2. There is an assignment operator in ClassA which takes an argument of type X and there is conversion function to type X in ClassB.
3. There is a conversion function to type ClassA in ClassB.

I don’t know how/if these match to the ABCD choice(s) you have.