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use core::ops::SubAssign;
use array_trait::Array;
use slice_ops::AsSlice;
#[const_trait]
pub trait ArrayDifferentiate<T, const N: usize>: Array + AsSlice<Item = T>
{
/// Differentiates array (discrete calculus)
///
/// # Example
///
/// ```rust
/// use array__ops::ops::*;
///
/// let mut a = [1, 2, 3];
///
/// a.differentiate();
///
/// assert_eq!(a, [1, 2 - 1, 3 - 2]);
/// ```
fn differentiate(&mut self)
where
T: SubAssign<T> + Copy;
}
impl<T, const N: usize> ArrayDifferentiate<T, N> for [T; N]
{
fn differentiate(&mut self)
where
T: SubAssign<T> + Copy
{
// TODO: visit_windowed_mut
if N > 0
{
let mut i = N - 1;
while i > 0
{
self[i] -= self[i - 1];
i -= 1;
}
}
}
}