Stockfish/src/learn/packed_sfen.h

#ifndef _PACKED_SFEN_H_
#define _PACKED_SFEN_H_

#include <vector>
#include <cstdint>

namespace Learner {

    // packed sfen
    struct PackedSfen { std::uint8_t data[32]; };

    // Structure in which PackedSfen and evaluation value are integrated
    // If you write different contents for each option, it will be a problem when reusing the teacher game
    // For the time being, write all the following members regardless of the options.
    struct PackedSfenValue
    {
        // phase
        PackedSfen sfen;

        // Evaluation value returned from Learner::search()
        std::int16_t score;

        // PV first move
        // Used when finding the match rate with the teacher
        std::uint16_t move;

        // Trouble of the phase from the initial phase.
        std::uint16_t gamePly;

        // 1 if the player on this side ultimately wins the game. -1 if you are losing.
        // 0 if a draw is reached.
        // The draw is in the teacher position generation command gensfen,
        // Only write if LEARN_GENSFEN_DRAW_RESULT is enabled.
        std::int8_t game_result;

        // When exchanging the file that wrote the teacher aspect with other people
        //Because this structure size is not fixed, pad it so that it is 40 bytes in any environment.
        std::uint8_t padding;

        // 32 + 2 + 2 + 2 + 1 + 1 = 40bytes
    };

    // Phase array: PSVector stands for packed sfen vector.
    using PSVector = std::vector<PackedSfenValue>;
}
#endif