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What this C++ memory-layout question tests

This is a medium-difficulty question that probes your understanding of how C++ allocates and organizes data in memory. It requires you to reason about object layout, padding, alignment, and pointer arithmetic on a 64-bit system—skills that matter especially in performance-critical environments like trading systems where memory efficiency directly affects latency and cache behavior.

To answer correctly, you need to trace through the code mentally, accounting for compiler alignment rules, structure padding, and how the architecture's word size affects object representation. The question rewards candidates who can visualize memory layout without running code and who understand why seemingly identical data members can occupy different amounts of space depending on their declaration order and type.

• Structure padding and alignment requirements
• Pointer size and arithmetic on 64-bit systems
• How the compiler organizes member variables in memory
• The relationship between sizeof() and actual field positions