33 pub fn add(num1: &i32, num2: &i32) -> i32 {  in add()
38 pub fn sub(num1: &i32, num2: &i32) -> i32 {  in sub()
43 pub fn mul(num1: &i32, num2: &i32) -> i32 {  in mul()
48 pub fn div(num1: &i32, num2: &i32) -> i32 {  in div()
89     fn add(&self, num1: i32, num2: i32) -> IpcResult<i32>;  in add()
91     fn sub(&self, num1: i32, num2: i32) -> IpcResult<i32>;  in sub()
93     fn mul(&self, num1: i32, num2: i32) -> IpcResult<i32>;  in mul()
95     fn div(&self, num1: i32, num2: i32) -> IpcResult<i32>;  in div()
141     fn add (&self, num1: i32, num2: i32) -> IpcResult<i32> {  in add()
144     fn sub (&self, num1: i32, num2: i32) -> IpcResult<i32> {  in sub()
147     fn mul (&self, num1: i32, num2: i32) -> IpcResult<i32> {  in mul()
150     fn div (&self, num1: i32, num2: i32) -> IpcResult<i32> {  in div()
156     fn add(&self, num1: i32, num2: i32) -> IpcResult<i32> {  in add()
165     fn sub(&self, num1: i32, num2: i32) -> IpcResult<i32> {  in sub()
174     fn mul(&self, num1: i32, num2: i32) -> IpcResult<i32> {  in mul()
183     fn div(&self, num1: i32, num2: i32) -> IpcResult<i32> {  in div()