Pass pointer in nodelets instead of message types

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Hi,

This question is closely related with this . The point is that I have two nodelets running in the same manager. I want to share something big among them (let us say, octomap), so that I would have to convert from OcTree to octomap_msgs and then undo the conversion, which is a waste in nodelets.

Is there any way I can simply give the pointer and publish it so that I can avoid this? Maybe creating a octomap_ptr message or something?

Thanks!