81   // Moves the single-sample value to a mounted "counts" array.
84   // Mounts (creating if necessary) an array of "counts" for multi-value
88   // Mounts "counts" storage that already exists. This does not attempt to move
93   // Creates "counts" storage and returns a span to it. The span's size must
94   // be the number of counts required by the histogram. Ownership of the
99   std::optional<span<HistogramBase::AtomicCount>> counts() {  in counts()  function
108   std::optional<span<const HistogramBase::AtomicCount>> counts() const {  in counts()  function
117   void set_counts(span<HistogramBase::AtomicCount> counts) const {  in set_counts()  argument
118     CHECK_EQ(counts.size(), counts_size_);  in set_counts()
119     counts_data_.store(counts.data(), std::memory_order_release);  in set_counts()
129   // Returns a reference into the `counts()` array. As `counts()` may be an
130   // empty optional until the array is populated, `counts()` must be checked for
133     return (counts().value())[index];  in counts_at()
136     return (counts().value())[index];  in counts_at()
142   // The number of counts in the histogram. Once `counts_data_` becomes
165 // A sample vector that uses local memory for the counts array.
202   // Simple local storage for counts.
206 // A sample vector that uses persistent memory for the counts array.
212                          const DelayedPersistentAllocation& counts);
225   // Persistent storage for counts.