Method sum

libraries/Statistic/Statistic.h:186–186

zero if count == zero

  // returns the number of values added
  count_type count() const   { return _cnt; };   // zero if count == zero
  value_type sum() const     { return _sum; };   // zero if count == zero
  value_type minimum() const { return _min; };   // zero if count == zero
  value_type maximum() const { return _max; };   // zero if count == zero