How to create new tf2::convert specialization?

edit

Before you point me to tutorials, I've seen all the existing ones and have looked at tf2_eigen.h and tf2_bullet.h as examples. I created a new header file in my package, named tf2_range.hpp with contents:

namespace tf2
{
inline
geometry_msgs::PointStamped toMsg(const sensor_msgs::Range& in)
{
    geometry_msgs::PointStamped out;
    out.header.stamp = in.header.stamp;
    out.header.frame_id = in.header.frame_id;
    out.point.y = out.point.z = 0;
    out.point.x = in.range;
    return out;
}

inline
void fromMsg(const sensor_msgs::Range& in, geometry_msgs::PointStamped& out)
{
    out.header.stamp = in.header.stamp;
    out.header.frame_id = in.header.frame_id;
    out.point.y = out.point.z = 0;
    out.point.x = in.range;
}

}

In a cpp file in that package, I include the header and call tf2::convert(range, pointStamped), resulting in the error:

CMakeFiles/sensor_fusion_node.dir/src/sensor_fusion.cpp.o: In function `void tf2::convert<sensor_msgs::Range_<std::allocator<void> >, geometry_msgs::PointStamped_<std::allocator<void> > >(sensor_msgs::Range_<std::allocator<void> > const&, geometry_msgs::PointStamped_<std::allocator<void> >&)':
sensor_fusion.cpp:(.text._ZN3tf27convertIN11sensor_msgs6Range_ISaIvEEEN13geometry_msgs13PointStamped_IS3_EEEEvRKT_RT0_[_ZN3tf27convertIN11sensor_msgs6Range_ISaIvEEEN13geometry_msgs13PointStamped_IS3_EEEEvRKT_RT0_]+0x1f): undefined reference to `void tf2::impl::Converter<true, true>::convert<sensor_msgs::Range_<std::allocator<void> >, geometry_msgs::PointStamped_<std::allocator<void> > >(sensor_msgs::Range_<std::allocator<void> > const&, geometry_msgs::PointStamped_<std::allocator<void> >&)'
collect2: error: ld returned 1 exit status
make[2]: *** [/home/dev/src/rosws/devel/.private/sensor_fusion/lib/sensor_fusion/sensor_fusion_node] Error 1
make[1]: *** [CMakeFiles/sensor_fusion_node.dir/all] Error 2
make: *** [all] Error 2

What's undefined about the way I'm handling this?