Reference as class member initialization

Question

I want to initialize a property of a class that holds a reference to another class by passing such a reference as a parameter to the constructor. However I receive an error:

Answer 1

The error is you're trying to assign through an uninitialized reference: a C++ reference cannot be assigned - the object it refers to is assigned instead - and so, if it's a member, it must be initialized in the initializer list (like the compiler says).