Struct ZobristTable 

pub struct ZobristTable { /* private fields */ }

Zobrist Hashing is a quick and incremental way to hash a chess position. ZobristTable contains unique, pseudo-randomly generated values used for calculating Zobrist Hash of a chess position.

Each Piece gets a unique number for each square. A single side to move gets a unique number. Each possible combination of castling rights gets a unique number. Each possible file for En-Passant gets a unique number.

Implementations

impl ZobristTable

pub fn new() -> Self

Returns a new ZobristTable with randomly seeded, unique values.

pub fn with_seed(seed: u64) -> Self

Returns a new ZobristTable with unique values generated from seeded rng.

pub fn generate_hash(&self, key: Key<'_>) -> HashKind

Generate a hash value from provided key in context of this ZobristTable.

pub fn update_hash( &self, hash: &mut HashKind, key: Key<'_>, move_info: MoveInfo, cache: Cache, )

Update a hash from a Position and its MoveInfo. The move that resulted in MoveInfo must already be applied to the position. update_hash works both directions, it can apply and remove a move from a position’s hash.

Arguments

hash: The hash value to directly update. key: A key taken from an updated Position. move_info: The MoveInfo that was applied to some position. cache: The original cache of the Position, before a move.

Trait Implementations

impl Clone for ZobristTable

fn clone(&self) -> ZobristTable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ZobristTable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ZobristTable

Default for ZobristTable is a table with a random seed.

fn default() -> Self

Returns the “default value” for a type.

impl Index<(Piece, Square)> for ZobristTable

Index used for accessing piece_hash.

type Output = u64

The returned type after indexing.

fn index(&self, index: (Piece, Square)) -> &Self::Output

Performs the indexing (container[index]) operation.

impl Index<Castling> for ZobristTable

type Output = u64

The returned type after indexing.

fn index(&self, index: Castling) -> &Self::Output

Performs the indexing (container[index]) operation.

impl Index<File> for ZobristTable

type Output = u64

The returned type after indexing.

fn index(&self, index: File) -> &Self::Output

Performs the indexing (container[index]) operation.

impl PartialEq for ZobristTable

fn eq(&self, other: &ZobristTable) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ZobristTable

impl StructuralPartialEq for ZobristTable