static double ptDistance(Pt a, Pt b) {
  ret pointDistance(a, b);
}

ifclass DoublePt
static double ptDistance(DoublePt a, DoublePt b) {
  ret pointDistance(a, b);
}

static double ptDistance(DoublePt a, Pt b) {
  ret pointDistance(a.x, a.y, b.x, b.y);
}
endif