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use slice_trait::Slice;
#[const_trait]
pub trait SliceShift<T>: Slice<Item = T>
{
/// Shifts the entire slice as a SISO shift register with mutliple values to the left. The output is given in-place in `ìtems`.
///
/// # Example
///
/// ```rust
/// use slice_ops::ops::*;
///
/// let mut register = [9, 8, 7, 6, 5, 4];
/// let mut io = [3, 2, 1];
///
/// register.shift_many_left(&mut io);
///
/// assert_eq!(register, [6, 5, 4, 3, 2, 1]);
/// assert_eq!(io, [9, 8, 7]);
/// ```
fn shift_many_left(&mut self, items: &mut [T]);
/// Shifts the entire slice as a SISO shift register with mutliple values to the left. The output is given in-place in `ìtems`.
///
/// # Example
///
/// ```rust
/// use slice_ops::ops::*;
///
/// let mut register = [4, 5, 6, 7, 8, 9];
/// let mut io = [1, 2, 3];
///
/// register.shift_many_right(&mut io);
///
/// assert_eq!(register, [1, 2, 3, 4, 5, 6]);
/// assert_eq!(io, [7, 8, 9]);
/// ```
fn shift_many_right(&mut self, items: &mut [T]);
/// Shifts the entire slice as a SISO shift register to the left. The output is given in-place in `ìtem`.
///
/// # Example
///
/// ```rust
/// use slice_ops::ops::*;
///
/// let mut register = [4, 3, 2];
/// let mut io = 1;
///
/// register.shift_left(&mut io);
///
/// assert_eq!(register, [3, 2, 1]);
/// assert_eq!(io, 4);
/// ```
fn shift_left(&mut self, item: &mut T);
/// Shifts the entire slice as a SISO shift register to the right. The output is given in-place in `ìtem`.
///
/// # Example
///
/// ```rust
/// use slice_ops::ops::*;
///
/// let mut register = [2, 3, 4];
/// let mut io = 1;
///
/// register.shift_right(&mut io);
///
/// assert_eq!(register, [1, 2, 3]);
/// assert_eq!(io, 4);
/// ```
fn shift_right(&mut self, item: &mut T);
}
impl<T> SliceShift<T> for [T]
{
fn shift_many_left(&mut self, items: &mut [T])
{
let len = self.len();
let m = items.len();
let q = m.min(len);
unsafe {
items.rotate_left(m.saturating_sub(len));
core::ptr::swap_nonoverlapping(self.as_mut_ptr(), items.as_mut_ptr(), q);
self.rotate_left(q);
}
}
fn shift_many_right(&mut self, items: &mut [T])
{
let len = self.len();
let m = items.len();
let q = m.min(len);
unsafe {
self.rotate_right(q);
core::ptr::swap_nonoverlapping(self.as_mut_ptr(), items.as_mut_ptr(), q);
items.rotate_right(m.saturating_sub(len));
}
}
fn shift_left(&mut self, item: &mut T)
{
let l = self.len();
if l <= 1
{
return;
}
let p = self.as_mut_ptr_range();
unsafe {
core::ptr::swap_nonoverlapping(p.start, item as *mut T, 1);
let x = p.start.read();
core::ptr::copy(p.start.add(1), p.start, l - 1);
p.end.sub(1).write(x);
}
}
fn shift_right(&mut self, item: &mut T)
{
let l = self.len();
if l <= 1
{
return;
}
let p = self.as_mut_ptr_range();
unsafe {
let x = p.end.sub(1).read();
core::ptr::copy(p.start, p.start.add(1), l - 1);
p.start.write(x);
core::ptr::swap_nonoverlapping(p.start, item as *mut T, 1);
}
}
}
#[cfg(test)]
mod test
{
#[test]
fn it_works()
{
}
}