54 struct HistogramStat {  struct
56   ~HistogramStat() {}  in ~HistogramStat()  argument
59   HistogramStat& operator=(const HistogramStat&) = delete;  argument
84   // To be able to use HistogramStat as thread local variable, it  argument
87   std::atomic_uint_fast64_t min_;
88   std::atomic_uint_fast64_t max_;
89   std::atomic_uint_fast64_t num_;
90   std::atomic_uint_fast64_t sum_;
91   std::atomic_uint_fast64_t sum_squares_;
92   std::atomic_uint_fast64_t buckets_[109]; // 109==BucketMapper::BucketCount()
93   const uint64_t num_buckets_;