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A reference does not make a copy, it is only guaranteed to be in scope for the duration of the callback.

The ConstPtr is a Boost Shared Pointer which will reference count the underlying data, and copies of the pointer can be persisted and will keep the data in scope for longer.

I suggest getting more information from pure C++ forums such as Stack Overflow. There are lots of valuable reading threads This is a little off topic for ROS Answers.

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