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[board] Return copies of rank and file bitboards from static lists

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This commit is contained in:
Eryn Wells 2023-12-31 09:26:20 -08:00
parent e30bcb3105
commit 1cc8b4520f
3 changed files with 31 additions and 4 deletions
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9
board/src/bitboard/bitboard.rs
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@ -1,5 +1,6 @@
// Eryn Wells <eryn@erynwells.me> // Eryn Wells <eryn@erynwells.me>
use super::library::{FILES, RANKS};
use super::BitScanner; use super::BitScanner;
use crate::Square; use crate::Square;
use std::fmt; use std::fmt;
@ -17,14 +18,14 @@ impl BitBoard {
BitBoard(bits) BitBoard(bits)
} }
pub fn rank(rank: u8) -> BitBoard { pub fn rank(rank: usize) -> BitBoard {
assert!(rank < 8); assert!(rank < 8);
BitBoard(0xFF).shift_north(rank) RANKS[rank]
} }
pub fn file(file: u8) -> BitBoard { pub fn file(file: usize) -> BitBoard {
assert!(file < 8); assert!(file < 8);
BitBoard(0x0101010101010101).shift_east(file) FILES[file]
} }
pub fn is_empty(&self) -> bool { pub fn is_empty(&self) -> bool {

25
board/src/bitboard/library.rs Normal file
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@ -0,0 +1,25 @@
// Eryn Wells <eryn@erynwells.me>
use super::BitBoard;
pub(super) const RANKS: [BitBoard; 8] = [
BitBoard(0xFF << 0 * 8),
BitBoard(0xFF << 1 * 8),
BitBoard(0xFF << 2 * 8),
BitBoard(0xFF << 3 * 8),
BitBoard(0xFF << 4 * 8),
BitBoard(0xFF << 5 * 8),
BitBoard(0xFF << 6 * 8),
BitBoard(0xFF << 7 * 8),
];
pub(super) const FILES: [BitBoard; 8] = [
BitBoard(0x0101010101010101 << 0),
BitBoard(0x0101010101010101 << 1),
BitBoard(0x0101010101010101 << 2),
BitBoard(0x0101010101010101 << 3),
BitBoard(0x0101010101010101 << 4),
BitBoard(0x0101010101010101 << 5),
BitBoard(0x0101010101010101 << 6),
BitBoard(0x0101010101010101 << 7),
];

1
board/src/bitboard/mod.rs
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@ -1,5 +1,6 @@
mod bit_scanner; mod bit_scanner;
mod bitboard; mod bitboard;
mod library;
mod shifts; mod shifts;
pub(crate) use self::bit_scanner::BitScanner; pub(crate) use self::bit_scanner::BitScanner;