func (this *Geos) Destroy(geom *Geom) {
runtime.SetFinalizer(geom, nil)
if geom.v != nil {
C.GEOSGeom_destroy_r(this.v, geom.v)
geom.v = nil
} else {
log.Printf("double free?")
}
}
func cGEOSGeom_destroy(g *C.GEOSGeometry) {
handlemu.Lock()
defer handlemu.Unlock()
C.GEOSGeom_destroy_r(handle, g)
}