Method add_one

errors/src/main.rs:28–30

(&self)

impl<'a> Adder<'a> {
    fn add_one(&self) -> Result<i8, OutOfBoundsError> {
        self.0.checked_add(1).ok_or(OutOfBoundsError::Overflow)
    }

    fn sub_one(&self) -> Result<i8, OutOfBoundsError> {
        self.0.checked_sub(1).ok_or(OutOfBoundsError::Underflow)