1 files changed, 74 insertions, 0 deletions
diff --git a/storage/ndb/test/include/NDBT_Stats.hpp b/storage/ndb/test/include/NDBT_Stats.hpp
new file mode 100644
index 00000000000..28212bdba17
--- /dev/null
+++ b/storage/ndb/test/include/NDBT_Stats.hpp
@@ -0,0 +1,74 @@
+/* Copyright (C) 2003 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef NDBT_STATS_HPP
+#define NDBT_STATS_HPP
+
+#include <ndb_global.h>
+
+class NDBT_Stats {
+public:
+  NDBT_Stats() { reset(); }
+  
+  void reset() { sum = sum2 = 0.0; max = DBL_MIN; ; min = DBL_MAX; n = 0;}
+  
+  void addObservation(double t) { 
+    sum+= t; 
+    sum2 += (t*t); 
+    n++; 
+    if(min > t) min = t;
+    if(max < t) max = t;
+  }
+  
+  double getMean() const { return sum/n;}
+  double getStddev() const { return sqrt(getVariance()); }
+  double getVariance() const { return (n*sum2 - (sum*sum))/(n*n);}
+  double getMin() const { return min;}
+  double getMax() const { return max;}
+  int    getCount() const { return n;}
+
+  NDBT_Stats & operator+=(const NDBT_Stats & c){
+    sum += c.sum;
+    sum2 += c.sum2;
+    n += c.n;
+    if(min > c.min) min = c.min;
+    if(max < c.max) max = c.max;
+    return * this;
+  }
+private:
+  double sum;
+  double sum2;
+  int n;
+  double min, max;
+};
+
+inline
+double
+NDB_SQRT(double x){
+  assert(x >= 0);
+
+  double y = 0;
+  double s = 1;
+  double r = 0;
+  while(y <= x){
+    y += s;
+    s += 2;
+    r += 1;
+  }
+  return r - 1;
+}
+
+#endif