How to overload functions in Rust using traits. Updated from source - https://goo.gl/StPQ1B

trait_overload.rs

struct Foo {
    value: u32
}

trait HasUIntValue {
    fn as_uint(self) -> u32;
}

impl Foo {
    fn add<T: HasUIntValue>(&mut self, value: T) {
        self.value += value.as_uint();
    }
}

impl HasUIntValue for i32 {
    fn as_uint(self) -> u32 {
        return self as u32;
    }
}

impl HasUIntValue for f64 {
    fn as_uint(self) -> u32 {
        return self as u32;
    }
}

#[test]
fn test_add_with_int() {
    let mut x = Foo { value: 10 };
    x.add(10i32);
    assert!(x.value == 20);
}

#[test]
fn test_add_with_float() {
    let mut x = Foo { value: 10 };
    x.add(10.0f64);
    assert!(x.value == 20);
}