public int ComparePrecedence(IMyOperator o)
{
bool result = (o is MyBaseOperator);
int tempPrecedence;
if (result)
{
MyBaseOperator other = (MyBaseOperator)o;
if (precedence > other.precedence)
{
tempPrecedence = 1;
}
else if (other.precedence == precedence)
{
tempPrecedence = 0;
}
else
{
tempPrecedence = -1;
}
return(tempPrecedence);
//since I'm not used to the bottom structure, I unfolded it above.
//return precedence > other.precedence ? 1 :
// other.precedence == precedence ? 0 : -1;
}
else
{
return(-o.ComparePrecedence(this));
}
}
public void OperatorsInBaseClassWorkAsExpected()
{
MyBaseOperator left = new MyBaseOperator(13);
MyBaseOperator right = new MyBaseOperator(11);
MyBaseOperator result;
Expression<MyBaseOperator> expression = new Expression<MyBaseOperator>();
expression.Parameters.Add("Left", left.GetType(), left);
expression.Parameters.Add("Right", right.GetType(), right);
expression.Text = "Left + Right";
result = expression.Evaluate();
Assert.AreEqual(24, result.Value);
expression.Text = "Left - Right";
result = expression.Evaluate();
Assert.AreEqual(2, result.Value);
}
