[Boost-users] [Geometry] please help; using buffer() extensions

(sorry another post; someone told me to put [library name] in [] in subject... learning something new every day :) Something of a repost, but I've learned a bit more on the path to being truly confused. It appears that boost\geometry\extensions\algorithms\buffer\buffer_inserter.hpp contains some specializations for buffering other shape types? But I'm out of my depth here... is there an example? What do I need to do in order to buffer: a point? A linestring? A vector of polygons? A heterogeneous collections of shapes? Is this generalization of buffer also going to work as a "deflate" for polygons? If someone can tell me "include these headers, use these algorithms", it will help a lot! Thanks John