8. References

Question.4

A developer passes a large sensor data struct to a processing function via const reference:

struct SensorData {
   float accel[3];
   float gyro[3];
   uint32_t timestamp;
}; // 28 bytes

void process(const SensorData &data) {
   data.timestamp = 0;  // Reset timestamp
   // ... process accel and gyro ...
}

Will this compile?

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Select Answer

Yes — const only affects the reference, not the data
Yes — but the modification is silently ignored at runtime
No — structs cannot be passed by reference
No — const reference means the data is read-only; modifying data.timestamp is a compilation error