Behavioral Design Patterns in C++ - Shapes Example - V

The video tutorial explains the implementation of the visitor pattern to calculate the area of shapes. It introduces adding a new visitor class and overriding visit methods. The tutorial uses the constant π from the Numbers header in C20 for calculations. It addresses handling special cases like lines, where area calculation is not possible, and suggests keeping the implementation empty or printing a message. The video demonstrates building and running the visitor pattern, highlighting its advantage of adding new operations without modifying existing code.

What message is printed when attempting to compute the area of a line?

What was the key benefit observed when adding a new operation to the hierarchy of shapes?