Comparing resource instances by label

Understanding C++ reference semantics and object comparison

This is a medium-difficulty C++ question that tests your ability to reason carefully about reference semantics, object identity, and how comparison operators behave when applied to different kinds of resource handles. It's the kind of question that separates candidates who have internalized C++ memory and reference rules from those relying on intuition.

To solve it, you need to trace through the code execution step by step, paying close attention to whether objects are being copied, referenced, or compared by value or by identity. The question rewards precision in understanding how C++ treats different variable bindings and what the semantics of comparison actually mean in context.

• References vs. copies in C++
• Object identity and equality semantics
• Operator overloading and default comparison behaviour
• Lifetime and scope of temporary objects