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Is the "byte" type in messages signed or unsigned?

asked 2015-01-27 10:55:20 -0500

johnw
33 ●5 ●7 ●10

updated 2015-01-27 11:04:52 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

It appears that moveit_msgs/CollisionObject uses the type byte which isn't discussed in the documentation for message types found at http://wiki.ros.org/msg . Is this an alias for uint8, int8, or some form of message structure?