Iter sum to a larger datatype

[hiraksarkar]

I am trying to work on an iterative sum, where the sum could be greater than the individual datatype limit. This is running into an overflow situation (which it should). Any idea on how to navigate the problem?

let vec : Vec<u8> = vec![100, 2, 3, 100, 100];
let sum : u32 = vec.iter().sum();

[zicklag]

Here's one way to do it. I'm not positive, but I don't there there is hardly any performance hit with the cast using as in the map().

let vec : Vec<u8> = vec![100, 2, 3, 100, 100];
let sum : u32 = vec.iter().map(|&x| x as u32).sum();