C++ POOL — DAY 13

A heterogeneous collection of toys handled through a single interface.

The theme is Toy Story: toys of different types — Buzz, Woody — that you want to store in the same box and treat the same way, even though each behaves in its own manner. This is the heart of object-oriented programming: writing code that works with types that do not exist yet.

A complete progression over the same Toy / Picture pair of classes: encapsulation, canonical form, inheritance (Buzz, Woody), virtual methods, double overloading of the << operator, and an Error class nested inside Toy for error reporting.