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  //Persistent variable test
  double &DoubleReference= sc.PersistVars->Doubles[0];
  float TestFloatValue = 3.0f;
  DoubleReference= TestFloatValue;//No exception occurs

//This is the basic framework of a study function.
SCSFExport scsf_SkeletonFunction(SCStudyGraphRef sc)
{
  // Section 1 - Set the configuration variables and defaults
  if (sc.SetDefaults)
  {
    sc.GraphName = "Persistent Variable Test";
    
    // During development set this flag to 1, so the DLL can be rebuilt without restarting Sierra Chart. When development is completed, set it to 0 to improve performance.
    sc.FreeDLL = 1;

    sc.AutoLoop = 1; //Auto looping is enabled.
    
    sc.Subgraph[0].Name = "Name";
    sc.Subgraph[0].DrawStyle = DRAWSTYLE_LINE;
    sc.Subgraph[0].PrimaryColor = RGB (0, 255, 0);
    
    sc.Input[0].Name = "Float Input";
    sc.Input[0].SetFloat(0.0f);
    
    return;
  }
  
  
  // Section 2 - Do data processing here
  
double &DoubleReference= sc.PersistVars->Doubles[0];
float TestFloatValue = 3.0f;
DoubleReference= TestFloatValue;//No exception occurs
sc.Subgraph[0][sc.Index]= DoubleReference;
  
}