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[board, core, bitboard] Clean up casts between Rank, File and BitBoard

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Let BitBoard::rank and BitBoard::file take a Rank and File directly, instead of a
u8 by reference. And then make the Rank/File::as_index const and return a value
rather than a reference.

All this allows you to convert between Rank, File, and BitBoard at compile tile
(i.e. as a const method) rather than needing to do runtime stuff.
This commit is contained in:
Eryn Wells 2025-05-23 18:32:18 -07:00
parent 588f049290
commit 3684e9b425
3 changed files with 24 additions and 25 deletions
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8
board/src/movement.rs
View file

@ -63,10 +63,10 @@ fn pawn_pushes(pawn: BitBoard, color: Color, occupancy: BitBoard) -> BitBoard {
match color {
Color::White => {
let second_rank = BitBoard::rank(&Rank::TWO.into());
const SECOND_RANK: BitBoard = BitBoard::rank(Rank::TWO);
let mut pushes = pawn.shift_north_one() & vacancy;
if !(pawn & second_rank).is_empty() {
if !(pawn & SECOND_RANK).is_empty() {
// Double push
pushes = pushes | (pushes.shift_north_one() & vacancy);
}
@ -74,10 +74,10 @@ fn pawn_pushes(pawn: BitBoard, color: Color, occupancy: BitBoard) -> BitBoard {
pushes
}
Color::Black => {
let seventh_rank = BitBoard::rank(&Rank::SEVEN.into());
const SEVENTH_RANK: BitBoard = BitBoard::rank(Rank::SEVEN);
let mut pushes = pawn.shift_south_one() & vacancy;
if !(pawn & seventh_rank).is_empty() {
if !(pawn & SEVENTH_RANK).is_empty() {
// Double push
pushes = pushes | (pushes.shift_south_one() & vacancy);
}