Behavioral Design Patterns in C++ - Document Framework - II

The video tutorial introduces a new document type called 'Numbers', which manages integer data to simplify implementation. It covers methods like 'set number' and 'print', and explains how to override save and load methods. The tutorial also discusses implementing versioning to handle different document versions. Practical use of the Numbers class is demonstrated, and future enhancements are hinted at for managing file versions.

Describe the process of saving and loading data in the Numbers document.

What is the significance of writing the version of the document to the stream?