// fields: type + name

sS tok_genEqualsAndHashCode(S className, LPairS fields, O... _) {

  optPar S qualifier = "";

  optPar bool flexEq;

  S argName = "o";

  while (pairsB(fields).contains(argName)) argName = "_" + argName;

  StringBuilder buf = new("\n\npublic bool equals(O \*argName*/) {\n");

  S instanceCheck = flexEq

    ? "_getClass(\*argName*/) == getClass()"

    : "\*argName*/ instanceof " + qualifier + className;

  if (empty(fields))

    buf.append("ret \*instanceCheck*/;\n");

  else {

    S x = makeVar();

    buf.append("if (!(" + instanceCheck + [[)) false;

    ]] + className + " \*x*/ = cast " + argName + [[;

    ret ]] + join(" && ", map(fields, func(PairS p) -> S {

      tok_isPrimitiveType(p.a)

        ? p.b + " == \*x*/." + p.b

        : "eq(" + p.b + ", \*x*/." + p.b + ")"

    })) + ";\n");

  }

  buf.append("}\n");

  buf.append([[

  public int hashCode() {

    int h = ]] + hashCode(className) + [[;

    ]] + concatMap_strings(fields, func(Pair<S> p) {

      "h = boostHashCombine(h, _hashCode(" + p.b + [[));

    ]]}) + [[ret h;

  }

  ]]);

  ret str(buf);

}