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According to sensor_msgs/Range.msg, the data is in msg->range. The range is a single number. If you were to use the sensor_msgs/LaserScan.msg instead the set of ranges would be found in msg->ranges. Then msg->range.size() would have some meaning (since it's a vector).
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According to sensor_msgs/Range.msg, the data is in msg->range. The range is a float32 (a single number. number).
If you were to use the sensor_msgs/LaserScan.msg instead instead, the set of ranges would be found in msg->ranges. Then msg->range.size() would have some meaning (since it's a vector).
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