cleaned up namespace in histogram

histogram.hpp

 // Copyright (C) 2006 - 2009 MicroNeil Research Corporation
 // Class to capture a histogram of events using a <set>
 
-#ifndef mn_histogram_included
-#define mn_histogram_included
+#pragma once
 
 #include <set>
 
-using namespace std;
+namespace codedweller {
 
 /** The Histogram class is managed set of HistogramRecords.
 *** We play some naughty tricks with pointers to break the rules and
 class HistogramRecord {                                                         // A record to assocate a key and count.
   public:
     int Key;                                                                    // Here is the key.
-    int Count;                                                                  // Here is the count.
+    mutable int Count;                                                          // Here is the count.
     HistogramRecord(const int NewKey) :                                         // We must have a key to make one.
       Key(NewKey), Count(0) {}                                                  // and a new one starts at count 0.
 
     }
 };
 
-class Histogram : public set<HistogramRecord> {                                 // A Histogram is a set of HistogramRecords
+class Histogram : public std::set<HistogramRecord> {                            // A Histogram is a set of HistogramRecords
   private:                                                                      // and a private hit counter...
     int HitCount;
   public:
     }
 };
 
-#endif
+} // End namespace codedweller