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Identifying design patterns in C++ code

This question asks you to recognize a classic Gang of Four design pattern from a provided C++ code snippet. Pattern recognition is a foundational skill in systems design and code review — interviewers use it to assess whether you can read unfamiliar code quickly, abstract its structure, and name the underlying architectural intent.

To approach this problem, trace the relationships between classes and objects in the snippet: look for object creation strategies, inheritance hierarchies, delegation chains, and behavioral contracts. Then match what you observe against the standard patterns: creational (Factory, Singleton, Builder), structural (Adapter, Decorator, Proxy, Facade), and behavioral (Observer, Strategy, Command, State, Template Method, Chain of Responsibility).

• Class and object responsibilities
• Inheritance vs. composition
• Intent and motivation of each Gang of Four pattern
• Trade-offs between different structural approaches