pub struct Position {

occupancy: u64,

pieces: u128,

score: i16,

result: u8,

stm_king: u8,

nstm_king: u8,

impl Position {

pub fn get_score(&self) -> f32 {

self.score as f32

}

pub fn get_result(&self) -> f32 {

self.result as f32 / 2.0

}

pub fn process_features<F>(&self, mut features: F)

where

F: FnMut(i16, i16),

{

let mut occupancy = self.occupancy;

let mut pieces = self.pieces;

const PIECE_VALUES: [i16; 14] = [ 0, 64, 128, 192, 256, 320, 0, 0, 384, 448, 512, 576, 640, 704, ];

while occupancy != 0 {

let square = occupancy.trailing_zeros() as i16;

let colored_piece = (pieces & 0b1111) as i16;

occupancy &= occupancy - 1;

pieces >>= 4;

let stm_feature = PIECE_VALUES[colored_piece as usize] + square;

let nstm_feature = PIECE_VALUES[(colored_piece ^ 8) as usize] + (square ^ 56);

features(stm_feature, nstm_feature);

}

}