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📜 WAYPOINT LESSON

Checkpoint: Defensive C++

⭐ beginner⏳ 19 min read📍 Lesson 178 of 204

Prove the boundary battery: add, multiply, index, and divide — each defined everywhere or nullopt, never UB.

Checkpoint on defensive C++: the full checked-arithmetic battery and a bounds-safe accessor, graded on adversarial extremes.