step 0.2.0

A trait that allows for stepping numeric types.
Documentation 
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use Step;

macro_rules! primitive_impl {
    ($t:ty) => {
        impl Step for $t {
            fn next(&self) -> Option<Self> {
                self.checked_add(1 as $t)
            }

            fn next_by(&self, by: &Self) -> Option<Self> {
                self.checked_add(*by)
            }

            fn prev(&self) -> Option<Self> {
                self.checked_sub(1 as $t)
            }

            fn prev_by(&self, by: &Self) -> Option<Self> {
                self.checked_sub(*by)
            }

            fn steps_to(&self, value: &Self) -> Self {
                if self > value {
                    self.checked_sub(*value).unwrap()
                } else {
                    value.checked_sub(*self).unwrap()
                }
            }
        }
    }
}

primitive_impl!(i8);
primitive_impl!(i16);
primitive_impl!(i32);
primitive_impl!(i64);
primitive_impl!(isize);
primitive_impl!(u8);
primitive_impl!(u16);
primitive_impl!(u32);
primitive_impl!(u64);
primitive_impl!(usize);