Low-Latency Tagged Union - Quant Developer Interview Question

Problem Description

Minimizing cache misses and memory allocations is critical in high-frequency trading systems to reduce latency. A Tagged Union, or Variant, optimizes memory layout by storing different message types in a contiguous block, avoiding the pointer indirection and vtable lookups associated with standard polymorphism. This structure requires manual object lifetime management and strict type safety to ensure data integrity without the overhead of standard library containers. Task Implement the MarketVa