@Override
	public int hashCode() {
		return hash(_generation, hash(_population, hash(getClass())));
	}
Indicates whether the population is guaranteed to be evaluated. If this
flag is {@code true}, the population possibly contains unevaluated
individuals.

@return {@code false}, if it is guaranteed that all individuals has
        already been evaluated, {@code true} otherwise
jenetics/src/main/java/io/jenetics/engine/EvolutionStart.java