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Difficulty: Hard
Category: template_metaprogramming
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Topics: template-specialization, constexpr, compile-time, fsm, non-type-template, template-metaprogramming
C++ template metaprogramming enables the creation of compile-time finite-state machines (FSMs), a technique crucial for building high-performance systems like exchange matching engines. By encoding state transition logic using template specializations, the FSM lookup table can be evaluated entirely by the compiler into a constexpr array. This approach eliminates runtime overhead and enforces valid transitions through the type system, guaranteeing performance and correctness for order lifecycle m
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