stats: allow cleaning the content of an histogram

CHANGES.md

@@ -24,6 +24,7 @@ Changes from ns-3.38 to ns-3-dev
 * (network) Added `Mac16Address::Mac16Address(uint16t addr)` and `Mac16Address::Mac64Address(uint64t addr)` constructors.
 * (lr-wpan) Added `LrwpanMac::MlmeGetRequest` function and the corresponding confirm callbacks as well as `LrwpanMac::SetMlmeGetConfirm` function.
 * (applications) Added `Tx` and `TxWithAddresses` trace sources in `UdpClient`.
+* (stats) Added `Histogram::Clear` function to clear the histogram contents.
 
 ### Changes to existing API
 

src/stats/model/histogram.cc

@@ -92,6 +92,12 @@ Histogram::AddValue(double value)
     m_histogram[index]++;
 }
 
+void
+Histogram::Clear()
+{
+    m_histogram.clear();
+}
+
 Histogram::Histogram(double binWidth)
 {
     m_binWidth = binWidth;

src/stats/model/histogram.h

@@ -102,6 +102,11 @@ class Histogram
      */
     void AddValue(double value);
 
+    /**
+     * Clear the histogram content.
+     */
+    void Clear();
+
     /**
      * \brief Serializes the results to an std::ostream in XML format.
      * \param os the output stream