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use core::ops::SubAssign;
use slice_trait::Slice;
#[const_trait]
pub trait SliceDifferentiate<T>: Slice<Item = T>
{
/// Differentiates the slice in-place.
///
/// Each value will be subtracted by the previous value.
///
/// It's assumed that the first value of the slice is preceded by zeros.
///
/// # Example
///
/// ```rust
/// use slice_ops::ops::*;
///
/// let mut x = [1, 5, 5, 6, 2, -1, 0, 0, 0];
///
/// x.differentiate();
///
/// assert_eq!(x, [1, 4, 0, 1, -4, -3, 1, 0, 0]);
///
/// x.integrate();
///
/// assert_eq!(x, [1, 5, 5, 6, 2, -1, 0, 0, 0]);
/// ```
fn differentiate(&mut self)
where
T: SubAssign<T> + Copy;
}
impl<T> SliceDifferentiate<T> for [T]
{
fn differentiate(&mut self)
where
T: SubAssign<T> + Copy
{
let len = self.len();
if len > 0
{
let mut i = len - 1;
while i > 0
{
self[i] -= self[i - 1];
i -= 1;
}
}
}
}
#[cfg(test)]
mod test
{
#[test]
fn it_works()
{
}
}