51   std::vector<std::pair<T, T> > ranges_;  variable
61     return ranges_.size();  in Add()
67   for (i = 0; i < ranges_.size() && ranges_[i].second < start; ++i) {  in Add()
73   if (i == ranges_.size()) {  in Add()
74     ranges_.push_back(std::make_pair(start, end));  in Add()
75     return ranges_.size();  in Add()
80   if (end < ranges_[i].first) {  in Add()
81     ranges_.insert(ranges_.begin() + i, std::make_pair(start, end));  in Add()
82     return ranges_.size();  in Add()
89   if (start < ranges_[i].first)  in Add()
90     ranges_[i].first = start;  in Add()
91   if (ranges_[i].second < end)  in Add()
92     ranges_[i].second = end;  in Add()
99   while ((i + 1) < ranges_.size() &&  in Add()
100          ranges_[i + 1].first <= ranges_[i].second) {  in Add()
101     ranges_[i].second = std::max(ranges_[i].second, ranges_[i + 1].second);  in Add()
102     ranges_.erase(ranges_.begin() + i + 1);  in Add()
105   return ranges_.size();  in Add()
119   return ranges_.size();  in size()
124   return ranges_[i].first;  in start()
129   return ranges_[i].second;  in end()
134   ranges_.clear();  in clear()