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What's the alignment? is a cooked quant interview question on language knowledge in Cpp.
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This is a straightforward question on C++ language fundamentals, testing whether you know the standard mechanism for inspecting type properties at compile time. It appears frequently in interviews at firms that work with performance-critical systems where memory layout matters—particularly in high-frequency trading, where engineers optimize data structures for cache efficiency and minimal padding.
The question probes practical knowledge of how to programmatically determine how a type is aligned in memory. This is essential when designing structures for low-latency communication, shared memory, or hardware-aligned buffers. A solid answer demonstrates familiarity with the standard library tools available in modern C++ for introspection.