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What this C++ language-knowledge question tests

This is a medium-difficulty question that probes your understanding of C++17 semantics and subtle language behaviour. Rather than testing algorithmic ability, it requires you to read code carefully, trace execution mentally, and understand how the compiler interprets modern C++ features.

Questions like this appear in interviews because they separate candidates who have hands-on experience with C++ from those who rely on surface-level knowledge. You'll need to reason about scope, control flow, type deduction, or standard library behaviour—the kinds of details that matter when writing robust, predictable code in a production environment.

• C++17-specific syntax and semantics
• Code comprehension under standard rules
• Attention to detail in language specifications