> I have no training in C so I've reached this far by trial and error. I
> have however discovered that if write a function such as
>
> /* pants.c
>weird of what! */
> #include "postgres.h"
> #include "utils/geo_decls.h"
> double
> pants(Point *pt)
> {
> return 2.0;
> }
>
> and compil
Following my original posting, I did a bit of hunitng in the source and
used them to come up with these functions:
/* get_x.c
a function to return the x coord of a point */
#include "postgres.h"
#include "utils/geo_decls.h"
double
get_x(Point *pt)
{
if (!PointerIsValid(pt))
