Method add

base/src/main/java/net/time4j/engine/StdOperator.java:443–457

(
        TimePoint<U, T> context,
        ChronoElement<?> element,
        boolean forward
    )

    // wildcard capture
    private static <U, T extends TimePoint<U, T>> T add(
        TimePoint<U, T> context,
        ChronoElement<?> element,
        boolean forward
    ) {

        U unit = context.getChronology().getBaseUnit(element);

        if (forward) {
            return context.plus(1, unit);
        } else {
            return context.minus(1, unit);
        }

    }

}