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There you have an example of C++ mixed node (pub/sub/srv) for ROS1 with Object-Oriented Programming:
https://roboticsbackend.com/oop-with-ros-in-cpp/
This may be a good enough base to build on. There are some differences from your code, such as with ros::NodeHandle.
In general, if your code works, don't worry - just keep building and coding :) But good examples are very helpful.
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