Lecture 4 - Slide 27 : 40
Const member functions - const and mutable

A member function may be logically constant, but the underlying state of the object may be physically non-constant (mutable)

It is possible to mark a data members as mutable

Mutable members can always be updated, even if they belong to a const object

A variant of Point with cached polar representation.
The implementation of class Point - with compilation problems.
A simple client program of Point.
Program output.