pub fn rotate_left(&mut self, mut by: usize) {
		let len = self.len();
		assert!(
			by <= len,
			"bit-slices cannot be rotated by more than their length",
		);
		if by == 0 || by == len {
			return;
		}
		let mut tmp = BitArray::<usize, O>::ZERO;
		while by > 0 {
			let shamt = cmp::min(mem::bits_of::<usize>(), by);
			unsafe {
				let tmp_bits = tmp.get_unchecked_mut(.. shamt);
				tmp_bits.clone_from_bitslice(self.get_unchecked(.. shamt));
				self.copy_within_unchecked(shamt .., 0);
				self.get_unchecked_mut(len - shamt ..)
					.clone_from_bitslice(tmp_bits);
			}
			by -= shamt;
		}
	}
/// Rotates the contents of a bit-slice to the left (towards the zero
/// index).
///
/// This essentially splits the bit-slice at `by`, then exchanges the two
/// pieces. `self[.. by]` becomes the first section, and is then followed by
/// `self[.. by]`.
///
/// The implementation is batch-accelerated where possible. It should have a
/// runtime complexity much lower than `O(by)`.
///
/// ## Original
///
/// [`slice::rotate_left`](https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left)
///
/// ## Examples
///
/// ```rust
/// use bitvec::prelude::*;
///
/// let bits = bits![mut 0, 0, 1, 0, 1, 0];
/// //      split occurs here ^
/// bits.rotate_left(2);
/// assert_eq!(bits, bits![1, 0, 1, 0, 0, 0]);
/// ```
Rotates the contents of a bit-slice to the left (towards the zero
index).

This essentially splits the bit-slice at `by`, then exchanges the two
pieces.

The implementation is batch-accelerated where possible. It should have a
runtime complexity much lower than `O(by)`.
Rotates the contents of a bit - slice to the left ( towards the zero index ) . This essentially splits the bit - slice at ` by ` then exchanges the two pieces . The implementation is batch - accelerated where possible . It should have a runtime complexity much lower than ` O ( by ) ` .
pub fn rotate_left(&mut self, mut by: usize) {
		let len = self.len();
		assert!(
			by <= len,
			"bit-slices cannot be rotated by more than their length",
		);
		if by == 0 || by == len {
			return;
		}
		let mut tmp = BitArray::<usize, O>::ZERO;
		while by > 0 {
			let shamt = cmp::min(mem::bits_of::<usize>(), by);
			unsafe {
				let tmp_bits = tmp.get_unchecked_mut(.. shamt);
				tmp_bits.clone_from_bitslice(self.get_unchecked(.. shamt));
				self.copy_within_unchecked(shamt .., 0);
				self.get_unchecked_mut(len - shamt ..)
					.clone_from_bitslice(tmp_bits);
			}
			by -= shamt;
		}
	}
pub fn rotate_left ( & mut self , mut by : usize ) { let len = self . len ( ) ; assert ! ( by len " " ) ; if by == 0 || by == len { return ; } let mut tmp = BitArray :: < usize , O > :: ZERO ; while by > 0 { let shamt = cmp :: min ( mem :: bits_of :: < usize > ( ) , by ) ; unsafe { let tmp_bits = tmp . get_unchecked_mut ( .. shamt ) ; tmp_bits . clone_from_bitslice ( self . get_unchecked ( .. shamt ) ) ; self . copy_within_unchecked ( shamt .. , 0 ) ; self . get_unchecked_mut ( len - shamt .. ) . clone_from_bitslice ( tmp_bits ) ; } by -= shamt ; } }
Rotates the contents of a bit-slice to the left (towards the zero
index).
Rotates the contents of a bit - slice to the left ( towards the zero index ) .
&mut self
by
usize
&mut self
by
usize
original
None
examples
```rust
use bitvec::prelude::*.


` ` ` rust use bitvec :: prelude :: * .