Struct trie_db::NibbleSlice[][src]

pub struct NibbleSlice<'a> { /* fields omitted */ }

Nibble-orientated view onto byte-slice, allowing nibble-precision offsets.

This is an immutable struct. No operations actually change it.

Example

use patricia_trie::nibbleslice::NibbleSlice;
fn main() {
  let d1 = &[0x01u8, 0x23, 0x45];
  let d2 = &[0x34u8, 0x50, 0x12];
  let d3 = &[0x00u8, 0x12];
  let n1 = NibbleSlice::new(d1);			// 0,1,2,3,4,5
  let n2 = NibbleSlice::new(d2);			// 3,4,5,0,1,2
  let n3 = NibbleSlice::new_offset(d3, 1);	// 0,1,2
  assert!(n1 > n3);							// 0,1,2,... > 0,1,2
  assert!(n1 < n2);							// 0,... < 3,...
  assert!(n2.mid(3) == n3);					// 0,1,2 == 0,1,2
  assert!(n1.starts_with(&n3));
  assert_eq!(n1.common_prefix(&n3), 3);
  assert_eq!(n2.mid(3).common_prefix(&n1), 3);
}

Implementations

impl<'a> NibbleSlice<'a>[src]

pub fn new(data: &'a [u8]) -> Self[src]

Create a new nibble slice with the given byte-slice.

pub fn new_offset(data: &'a [u8], offset: usize) -> Self[src]

Create a new nibble slice with the given byte-slice with a nibble offset.

pub fn iter(&'a self) -> NibbleSliceIterator<'a>[src]

Get an iterator for the series of nibbles.

pub fn from_stored(i: &NodeKey) -> NibbleSlice<'_>[src]

Get nibble slice from a NodeKey.

pub fn to_stored(&self) -> NodeKey[src]

Helper function to create a owned NodeKey from this NibbleSlice.

pub fn to_stored_range(&self, nb: usize) -> NodeKey[src]

Helper function to create a owned NodeKey from this NibbleSlice, and for a given number of nibble. Warning this method can be slow (number of nibble does not align the original padding).

pub fn is_empty(&self) -> bool[src]

Return true if the slice contains no nibbles.

pub fn len(&self) -> usize[src]

Get the length (in nibbles, naturally) of this slice.

pub fn at(&self, i: usize) -> u8[src]

Get the nibble at position i.

pub fn mid(&self, i: usize) -> NibbleSlice<'a>[src]

Return object which represents a view on to this slice (further) offset by i nibbles.

pub fn advance(&mut self, i: usize)[src]

Advance the view on the slice by i nibbles.

pub fn back(&self, i: usize) -> NibbleSlice<'a>[src]

Move back to a previously valid fix offset position.

pub fn starts_with(&self, them: &Self) -> bool[src]

Do we start with the same nibbles as the whole of them?

pub fn common_prefix(&self, them: &Self) -> usize[src]

How many of the same nibbles at the beginning do we match with them?

pub fn right(&'a self) -> Partial<'_>[src]

Return Partial representation of this slice: first encoded byte and following slice.

pub fn right_iter(&'a self) -> impl Iterator<Item = u8> + 'a[src]

Return an iterator over Partial bytes representation.

pub fn right_range_iter(&'a self, to: usize) -> impl Iterator<Item = u8> + 'a[src]

Return Partial bytes iterator over a range of byte.. Warning can be slow when unaligned (similar to to_stored_range).

pub fn left(&'a self) -> Prefix<'_>[src]

Return left portion of NibbleSlice, if the slice originates from a full key it will be the Prefix of the node.

pub fn left_owned(&'a self) -> (SmallVec<[u8; 36]>, Option<u8>)[src]

Owned version of a Prefix from a left method call.

Trait Implementations

impl<'a> Clone for NibbleSlice<'a>[src]

impl<'a> Copy for NibbleSlice<'a>[src]

impl<'a> Debug for NibbleSlice<'a>[src]

impl<'a> Eq for NibbleSlice<'a>[src]

impl<'a> From<NibbleSlice<'a>> for NibbleVec[src]

impl<'a> Into<(usize, SmallVec<[u8; 36]>)> for NibbleSlice<'a>[src]

impl<'a> Ord for NibbleSlice<'a>[src]

impl<'a> PartialEq<NibbleSlice<'a>> for NibbleSlice<'a>[src]

impl<'a> PartialOrd<NibbleSlice<'a>> for NibbleSlice<'a>[src]

Auto Trait Implementations

impl<'a> RefUnwindSafe for NibbleSlice<'a>

impl<'a> Send for NibbleSlice<'a>

impl<'a> Sync for NibbleSlice<'a>

impl<'a> Unpin for NibbleSlice<'a>

impl<'a> UnwindSafe for NibbleSlice<'a>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> MaybeDebug for T where
    T: Debug
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.