private Pack<T> extract(BinaryIndex index) {
ArrayList<T> items = new ArrayList<T>();
ArrayList<Boolean> b = index.getIndex();
for (int i = 0; i < b.size(); ++i) {
if (b.get(i)) {
items.add(this.map_.get(i));
}
}
return new Pack<T>(this.eval(index), items);
}
private Long eval(BinaryIndex index) {
Long sum = 0L;
ArrayList<Boolean> b = index.getIndex();
for (int i = 0; i < b.size(); ++i) {
if (b.get(i)) {
sum += this.items_.get(this.map_.get(i));
}
}
return sum;
}
