pleco_engine 0.1.6

A blazingly-fast Chess AI.
Documentation 
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use std::ops::{Index,IndexMut};
use pleco::core::masks::*;
use pleco::{PieceType, SQ,Piece};

use super::{StatBoard,NumStatCube};

/// CapturePieceToBoards are addressed by a move's
/// [player][moved piecetype][to][captured piecetype] information.
pub struct CapturePieceToHistory {
    a: [[[i16; PIECE_TYPE_CNT]; SQ_CNT]; PIECE_CNT]
}

// [player][moved piecetype][to][captured piecetype]
#[allow(non_camel_case_types)]
type CP_idx = (Piece, SQ, PieceType);

impl Index<CP_idx> for CapturePieceToHistory {
    type Output = i16;

    #[inline(always)]
    fn index(&self, idx: CP_idx) -> &Self::Output {
        unsafe {
            self.a.get_unchecked(idx.0 as usize)    // [Moved Piece]
                .get_unchecked((idx.1).0 as usize)  // [to square]
                .get_unchecked(idx.2 as usize)      // [Captured piece type]
        }
    }
}

impl IndexMut<CP_idx> for CapturePieceToHistory {
    #[inline(always)]
    fn index_mut(&mut self, idx: CP_idx) -> &mut Self::Output {
        unsafe {
            self.a.get_unchecked_mut(idx.0 as usize)    // [Moved Piece]
                .get_unchecked_mut((idx.1).0 as usize)  // [to square]
                .get_unchecked_mut(idx.2 as usize)      // [Captured piece type]
        }
    }
}

impl StatBoard<i16, CP_idx> for CapturePieceToHistory {
    const FILL: i16 = 0;
}

impl NumStatCube<CP_idx> for CapturePieceToHistory {
    const D: i32 = 324;
    const W: i32 = 2;
}