default <T> ElementComparator<T>
	map(final Function<? super T, ? extends V> mapper) {
		return (u, v, i) -> compare(mapper.apply(u), mapper.apply(v), i);
	}
Return an element comparator for the mapped type {@code T}.

@param mapper the mapper function
@param <T> the new comparator type
@return an element comparator for the mapped type {@code T}
jenetics.ext/src/main/java/io/jenetics/ext/moea/ElementComparator.java