func (this *Geos) ExteriorRing(geom *Geom) *Geom {
ring := C.GEOSGetExteriorRing_r(this.v, geom.v)
if ring == nil {
return nil
}
return &Geom{ring}
}
func cGEOSGetExteriorRing(g *C.GEOSGeometry) *C.GEOSGeometry {
handlemu.Lock()
defer handlemu.Unlock()
return C.GEOSGetExteriorRing_r(handle, g)
}