Struct k0i::cumsum::CumSum

pub struct CumSum<T> { /* private fields */ }

CumSum is a struct that contains vec of cumulative sum.

let x = vec![1, 2, 3];
let cs = k0i::cumsum::CumSum::new(&x);
assert_eq!(cs.sec_ref(), &[0, 1, 3, 6]);

Implementations

impl<T> CumSum<T> where
    T: PartialOrd + Copy + Default + Add<Output = T> + Sub<Output = T>, 

pub fn new(v: &[T]) -> Self

pub fn sec_ref(&self) -> &Vec<T>

pub fn sec(&self) -> Vec<T>

pub fn sum(&self, left: usize, right: usize) -> T

return sum of the section that containes [left, right)

let x = vec![1,2,3,4,5];
let cs = k0i::cumsum::CumSum::new(&x);
assert_eq!(cs.sum(2,4),x[2]+x[3]);
assert_eq!(cs.sum(0,4),x.iter().take(4).sum());