Recycling a versioned record

Tracing execution and understanding versioned state in C++

This is a medium-difficulty code-tracing question that tests your ability to follow the flow of a C++ program involving state updates and version tracking. It requires careful attention to how variables are modified, reassigned, and accessed across multiple operations.

To solve this type of problem, you need to mentally execute the program step by step, keeping track of object state, reference semantics, and any side effects from method calls or assignments. Quant and systems roles use these questions to verify that candidates can reason precisely about program behaviour without running code—a critical skill when reasoning about market data updates, risk calculations, or trading logic in live systems.

• Object state and mutation
• Reference vs. value semantics in C++
• Order of execution and side effects
• Output prediction and verification