Placement New
summary
Shows live code that constructs types into a raw buffer and then breaks when reusing the slot without a proper destructor call, demonstrating undefined behavior and a visible pointer aliasing bug. Compares a char array + cast approach with correct std::aligned_storage usage and shows when placement new requires std::launder to recover a pointer. Presents numbers for bytes and alignment, replaces the fragile pattern with aligned allocation and explicit destruction, and the fixed version works reliably.
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