public ExpressionOperator[] GetOperators()
 {
     ExpressionOperator[] ops = new ExpressionOperator[m_operators.Count];
     int i = 0;
     foreach (ExpressionOperator op in m_operators.Values)
     {
         ops[i] = op;
         i += 1;
     }
     return ops;
 }
 public void Remove(ExpressionOperator op)
 {
     m_operators.Remove(op.FunctionName);
 }
 public void Clear(ExpressionOperator op)
 {
     m_operators.Clear();
 }
 public void Add(ExpressionOperator op)
 {
     m_operators[op.Identifier] = op;
 }