Question

What does a mutable member of a class mean?

(a) A member that can never be changed

(b) A member that can be updated only if it not a member of constant object

(c) A member that can be updated even if it a member of constant object

(d) A member that is global throughout the class

I have been asked this question during an interview.

This key question is from Classes in division Source Files, Classes and Operator Overloading in C++ of C++

Answer 1

Correct answer is (c) A member that can be updated even if it a member of constant object

For explanation: Mutable members are those which can be updated even if it a member of a constant object. You can change their value even from a constant member function of that class.