54     std::pair<S, T> first() const {  in first()  function
80             return high->first == x ? high->second : low->second;  in findY()
82             return ((high->first - x) * low->second + (x - low->first) * high->second)  in findY()
83                     / (high->first - low->first);  in findY()
89             const S interval =  high->first - low->first;  in findY()
92             if (mMemo.count(low->first) != 0) {  in findY()
93                 const S t = (x - low->first) / interval;  in findY()
95                 const auto &memo = mMemo[low->first];  in findY()
129                         ? (low->second - low2->second) / (low->first - low2->first)  in findY()
132                         ? (high2->second - high->second) / (high2->first - high->first)  in findY()
141                         ? (high->second - low2->second) / (high->first - low2->first)  in findY()
145                         ? (high2->second - low->second) / (high2->first - low->first)  in findY()
167             const S t = (x - low->first) / interval;  in findY()
178                 mMemo[low->first] = std::make_tuple(c1, c2, c3);  in findY()
244             config->xy.push_back(pt.first);  in writeToConfig()
296         bool first = true;  in toString()  local
298             if (first) {  in toString()
299                 first = false;  in toString()
304             ss << pt.first << ", " << pt.second << "}";  in toString()