MB-33549: add isEmpty method to HdrHistogram

Used in new EPStats tests, and generally useful. Change-Id: Iba1a031de27df8744311a526e3ca3b62c3bea876 Reviewed-on: https://review.couchbase.org/c/platform/+/173268 Reviewed-by: Dave Rigby <daver@couchbase.com> Tested-by: Build Bot <build@couchbase.com>
couchbase · Apr 5, 2022 · a3c5cb0 · a3c5cb0
1 parent 5f42599
commit a3c5cb0
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diff --git a/hdrhistogram/hdrhistogram.cc b/hdrhistogram/hdrhistogram.cc
@@ -101,6 +101,10 @@ uint64_t HdrHistogram::getValueCount() const {
     return static_cast<uint64_t>(histogram.rlock()->get()->total_count);
 }
 
+bool HdrHistogram::isEmpty() const {
+    return getValueCount() == 0;
+}
+
 uint64_t HdrHistogram::getMinValue() const {
     return static_cast<uint64_t>(hdr_min(histogram.rlock()->get()));
 }

diff --git a/include/hdrhistogram/hdrhistogram.h b/include/hdrhistogram/hdrhistogram.h
@@ -272,6 +272,11 @@ class HdrHistogram {
      */
     uint64_t getValueCount() const;
 
+    /**
+     * Returns true if zero values have been added to the histogram.
+     */
+    bool isEmpty() const;
+
     /**
      * Returns the min value stored to the histogram
      */