integer.rs

use std::ops::{Add, Div, Mul, Range, Rem, Shl, Shr, Sub};

pub trait Uint:
    Add<Output = Self>
    + Sub<Output = Self>
    + Mul<Output = Self>
    + Div<Output = Self>
    + Rem<Output = Self>
    + Shl<Output = Self>
    + Shr<Output = Self>
    + From<u8>
    + PartialEq
    + PartialOrd
    + Ord
    + Eq
    + Copy
{
}

impl<U> Uint for U where
    U: Add<Output = U>
        + Sub<Output = U>
        + Mul<Output = U>
        + Div<Output = U>
        + Rem<Output = U>
        + Shl<Output = U>
        + Shr<Output = U>
        + From<u8>
        + PartialEq
        + PartialOrd
        + Ord
        + Eq
        + Copy
{
}


pub fn sum_range<T>(range: &Range<T>) -> T
where
    T: Uint,
    Range<T>: Iterator<Item = T>,
{
    let sum: T = (range.start..range.end).fold(T::from(0), |sum, i| sum + i);
    sum
}

fn main() {
    println!("{:?}", sum_range::<u16>(&(1..101)));
}

Simple integer trait without the help of num_traits