Which of the following functions must use reference.
(A) Assignment operator function
(B) Copy Constructor
(C) Destructor
(D) Parameterized constructor
Answer: (B)
Explanation: A copy constructor is called when an object is passed by value. Copy constructor itself is a function. So if we pass argument by value in a copy constructor, a call to copy constructor would be made to call copy constructor which becomes a non-terminating chain of calls. Therefore compiler doesn’t allow parameters to be pass by value.
See https://www.geeksforgeeks.org/copy-constructor-in-cpp/amp/ for details.
Quiz of this Question