Struct Position 

pub struct Position { /* private fields */ }

Two 42-bit player boards inside Connect Four’s 7×7 sentinel layout.

Each column occupies seven adjacent bits: six playable cells and one zero sentinel. The spare row makes horizontal and diagonal shifts unable to wrap from one column into the next.

Implementations

impl Position

pub const fn start() -> Self

pub const fn side_to_move(self) -> Side

pub const fn bits(self, side: Side) -> u64

pub const fn occupied(self) -> u64

pub const fn ply(self) -> u8

pub const fn key(self) -> u64

Pascal Pons’ compact, collision-free key for legal Connect Four boards.

The side-to-move board is a subset of occupancy; adding the bottom mask encodes each column height in its sentinel bit.

pub fn side_at(self, cell: Cell) -> Option<Side>

pub const fn playable_bits(self) -> u64

One set bit per non-full column, computed with one addition.

pub const fn can_play(self, column: Column) -> bool

pub fn legal_moves(self) -> MoveList

Returns legal moves in deterministic center-first order.

pub fn is_winning_move(self, side: Side, mv: Move) -> bool

pub fn result(self) -> GameResult

pub fn winning_cells(self) -> Vec<Cell>

pub fn make_move(&mut self, mv: Move) -> Result<Undo, MoveError>

pub fn unmake_move(&mut self, undo: Undo)

pub fn from_moves(moves: &[Move]) -> Result<Self, MoveError>

pub fn mirrored(self) -> Self

pub const fn has_four(bits: u64) -> bool

Trait Implementations

impl Clone for Position

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Position

impl Debug for Position

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

Formats the value using the given formatter.

impl Default for Position

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Position

impl Hash for Position

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Position

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Position