I have strict safety rules for this project, one of which requires that all geometries are thread-safe pointers. So in the example you show, it would not be safe to share the tg_geom pointer with other threads because it belongs on the stack instead of the heap.

Yet I do see the need for avoiding allocations when working with lots of simple geometries like points and rects, and for my use I made functions like tg_geom_intersects_xy and tg_geom_intersects_rect to perform relation operations directly on point and rectangle values.