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In short, remove the _2 parameter then you should get what you desire.

In short, remove the _2 parameter then you should get what you desire.

In short, remove the _2 parameter then you should get what you desire.

This will call your callback using the received message as the first parameter and cv_pref_ptr as the second. Depending on how you desire to use the pointer you might want to use boost::ref to pass the pointer as reference (if you want to change the pointer, not the pointed object). Also as it is now the cv_pref_ptr is declared locally and thus might will go out of scope.

Is there anything that prevents you from making the cv_pref_ptr a member variable of the class?

In short, remove the _2 parameter then you should get what you desire.