Today's mission involves using multiple Object-Oriented Programming (OOP) principles to tackle complex tasks in C++. When principles like Encapsulation, Abstraction, Polymorphism, and Composition are blended, the resulting code becomes streamlined and easier to manage.

Our goal is to dissect two real-world examples, gaining insights into how these principles can seamlessly orchestrate solutions in C++.

Let's design an online library system using C++ to reinforce our understanding of Encapsulation and Polymorphism. Encapsulation will help us protect the attributes of books, members, and transactions, ensuring they are accessible in a controlled manner. Polymorphism will demonstrate its power by enabling a single interface for different forms, such as digital and print versions of books.