102     if (!weight.Member()) rest_.push_back(W::NoWeight());  in UnionWeight()
151     rest_.clear();  in Clear()
154   size_t Size() const { return first_.Member() ? rest_.size() + 1 : 0; }  in Size()
156   const W &Back() const { return rest_.empty() ? first_ : rest_.back(); }  in Back()
165   void Sort() { rest_.sort(comp_); }  in Sort()
169     if (rest_.empty()) {  in Back()
172       return rest_.back();  in Back()
176   UnionWeight(W w1, W w2) : first_(std::move(w1)), rest_(1, std::move(w2)) {}  in UnionWeight()
179   std::list<W> rest_;  // Remaining weights in set.  variable
187     rest_.push_back(std::move(weight));  in PushBack()
193       rest_.push_back(std::move(weight));  in PushBack()
199       rest_.push_back(std::move(weight));  in PushBack()
201       rest_.push_back(first_);  in PushBack()
213         rest_(weight.rest_),  in UnionWeightIterator()
215         it_(rest_.begin()) {}  in UnionWeightIterator()
217   bool Done() const { return init_ ? !first_.Member() : it_ == rest_.end(); }  in Done()
231     it_ = rest_.begin();  in Reset()
236   const std::list<W> &rest_;  variable
247         rest_(weight.rest_),  in UnionWeightReverseIterator()
249         it_(rest_.rbegin()) {}  in UnionWeightReverseIterator()
253   const L &Value() const { return it_ == rest_.rend() ? first_ : *it_; }  in Value()
256     if (it_ == rest_.rend()) {  in Next()
265     it_ = rest_.rbegin();  in Reset()
270   const std::list<L> &rest_;  variable