public static NeuOperation Execute(
        this NeuInterpreter interpreter,
        NeuExpression operand,
        NeuPostfixOperator op)
    {
        switch (op.OperatorType)
        {
        case NeuUnaryOperatorType.Increment:

            return(interpreter.PostfixIncrement(operand));

        ///

        case NeuUnaryOperatorType.Decrement:

            return(interpreter.PostfixDecrement(operand));

        ///

        default:

            throw new Exception();
        }
    }
 public static int GetPrecedence(
     this NeuPostfixOperator prefixOp)
 {
     throw new Exception();
 }