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I think the answer of paulbovbel is the correct one. You just forgot to put a space in this line (between the >> ):

distance_sub = nh.subscribe<pcl::pointcloud<pcl::pointxyz>>("/distance_sensors", 1, &SafetyBelt::distanceCallback, this);

Change to this:

distance_sub = nh.subscribe<pcl::pointcloud<pcl::pointxyz> >("/distance_sensors", 1, &SafetyBelt::distanceCallback, this);

I think the answer of paulbovbel is the correct one. You just forgot to put a space in this line (between the >> ):

distance_sub = nh.subscribe<pcl::pointcloud<pcl::pointxyz>>("/distance_sensors", 1, &SafetyBelt::distanceCallback, this);

distance_sub = nh.subscribe<pcl::pointcloud<pcl::pointxyz> >("/distance_sensors", 1, &SafetyBelt::distanceCallback, this);