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Is it possible to have a callback function other than type void? If yes, how would you handle a situation where you call ros::spinOnce() and say you are subscribing to two different topics each with their own callback function... how would you store the variable that one of the callback functions returned?
I would say: No.
For the reason that you basically explained yourself: What would one do with the return value?, What is the meaning of that?
PS: Maybe, your intended usage of ros::spinOnce is based on a misconception. ros::spinOnce will not call one callback, but all available callbacks at the time. For more information, see: http://www.ros.org/wiki/roscpp/Overview/Callbacks%20and%20Spinning
But who would use that? Callbacks come from spin, so what should happen in spin if a callback returns false? Things like error handling in client code should not go through spin, but be handled directly by the callback (IMO). Figuring out what callback caused a false return would also be messy.
Asked: 2012-07-26 07:07:57 -0600
Seen: 947 times
Last updated: Jul 27 '12
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