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I am quite new to C++. I know that callbacks with return type of ConstPtr& are of boost::shared_ptr<const MsgType> type.

Now, when dealing with callbacks, does one copy or initialize objects by reference? For example, I have a ROS msg with fields int x and int y[]. Within the callback, would I copy x and y or initialize references for both of them?

Another thing, how can I know which objects are being copied and which ones are being referenced? Let's say msg->x and msg->y are they copied or referenced?

I am not familiar with object lifecycle and RAII at this point, could someone please explain to me in Layman's terms what's going on within ROS callbacks when ConstPtr& is used?

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