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const Correctness & constexpr
const propagates read-only intent through your whole API; constexpr moves computation to compile time so lookup tables and config land in flash with zero runtime cost.
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What is const correctness and why design for it from the start?What's the difference between const and constexpr?Why is constexpr especially valuable on a microcontroller?Does a const member function guarantee nothing it touches can change?Why prefer constexpr or enum class over #define for constants?
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