testAssignUtil.h

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/*********************************************************************
** Copyright (c) 2006 MaK Technologies, Inc.
** All rights reserved.
*********************************************************************/
/*********************************************************************
** $RCSfile: testAssignUtil.h,v $ $Revision: 1.1 $ $State: Exp $
********************************************************************/
#ifndef TD_TEST_ASSIGN_UTIL
#define TD_TEST_ASSIGN_UTIL

//
// Utility class tests if data is changed while assigning it.
// If the data being tested has an operator = function, use set(old, new)
// If not then use if (set.test(old.<value>(), new.<value>())) and assign the value 
// yourself inside the if statement.
//

class TdTestAssignUtil {
public: 
   TdTestAssignUtil(float tol = -1.0, double dTol = -1.0)
   {
      mTol = (tol < 0) ? 1.0e-6 : tol;
      mDTol = (dTol < 0) ? 1.0e-9 : dTol;
      myChanged = false;
   }

   void operator() (float& oldVal, const float & newVal)
   {
      if (fabs(oldVal - newVal) > mTol)
      {
         myChanged = true;
         oldVal = newVal;
      }
   }
   bool test (const float& oldVal, const float & newVal)
   {
      myChanged = (fabs(oldVal - newVal) > mTol);
      return myChanged;
   }

   void operator() (double& oldVal, const double & newVal)
   {
      if (fabs(oldVal - newVal) > mDTol)
      {
         myChanged = true;
         oldVal = newVal;
      }
   }
   bool test (const double& oldVal, const double & newVal)
   {
      myChanged = (fabs(oldVal - newVal) > mDTol);
      return myChanged;
   }

   template <class _T>
   void operator()(_T& oldVal, const _T& newVal)
   {
      // Note use of == instead of !=
      if (!(oldVal == newVal))
      {
         myChanged = true;
         oldVal = newVal;
      }
   }

   template <class _T>
   bool test(const _T& oldVal, const _T& newVal)
   {
      // Note use of == instead of !=
      if (!(oldVal == newVal))
      {
         myChanged = true;
         return true;
      }
      return false;
   }

   // Returns whether any of the preceeding assignments have changed 
   // a value.

   bool changed() const
   {
      return myChanged;
   }

   // Reset the change flag to false
   void reset()
   {
      myChanged = false;
   }

protected:
   bool myChanged;
   float mTol;
   double mDTol;
};

#endif