Callback a template function

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Hellow,

I have a template class Main<t>. I'm trying to use one of the function of this class as a callBack for a subscriber but I can't compile my code.

If I put a value in the template :

/home/ros/catkin_ws/src/Tobot/stalker/src/Stalker.cpp:27: undefined reference to `Main<pcl::PointXYZRGBA>::doWork(boost::shared_ptr<sensor_msgs::PointCloud2_<std::allocator<void> > const> const&)'

If I don't :

/home/ros/catkin_ws/src/Tobot/stalker/src/Stalker.cpp:27:86: erreur: ‘template<class T> class Main’ used without template parameters
make[2]: *** [Tobot/stalker/CMakeFiles/stalker_node.dir/src/Stalker.cpp.o] Erreur 1

The code for those errors would be respectively :

pointcloud_sub = my_node.subscribe<sensor_msgs::PointCloud2> ("cloud_filtered", 1, &Main<pcl::PointXYZRGBA>::doWork, &main);

pointcloud_sub = my_node.subscribe<sensor_msgs::PointCloud2> ("cloud_filtered", 1, &Main::doWork, &main);

Any help to get this working would be appreciated.