zobrist.h

/*
    This file is part of Cute Chess.
    Copyright (C) 2008-2018 Cute Chess authors

    Cute Chess is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Cute Chess is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Cute Chess.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef ZOBRIST_H
#define ZOBRIST_H

#include <QtGlobal>

namespace Chess {
class Piece;

class LIB_EXPORT Zobrist
{
    public:
        Zobrist(const quint64* keys = nullptr);
        virtual ~Zobrist() {}

        bool isInitialized() const;
        virtual void initialize(int squareCount,
                    int pieceTypeCount);

        virtual quint64 side() const;
        virtual quint64 piece(const Piece& piece, int square) const;
        virtual quint64 reservePiece(const Piece& piece, int slot) const;

    protected:
        int squareCount() const;
        int pieceTypeCount() const;
        const quint64* keys() const;

        static quint64 random64();

    private:
        static int random32();
        static int s_randomSeed;

        bool m_initialized;
        int m_squareCount;
        int m_pieceTypeCount;
        const quint64* m_keys;
};

inline int Zobrist::squareCount() const
{
    return m_squareCount;
}

inline int Zobrist::pieceTypeCount() const
{
    return m_pieceTypeCount;
}

inline const quint64* Zobrist::keys() const
{
    return m_keys;
}

} //namespace Chess
#endif // ZOBRIST