CollectionBuildStateDataSize

#define CollectionBuildStateDataSize   2

To pass the internal state of our collection between the transfn and finalfn we need to wrap it into a custom type first, the CollectionBuildState type in our case.

The extra "data" member can optionally be used to pass additional constant arguments to a finalizer function.

Definition at line 35 of file lwgeom_accum.h.