score.h

/*
  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
  Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file)

  Stockfish 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.

  Stockfish 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef SCORE_H_INCLUDED
#define SCORE_H_INCLUDED

#include <variant>
#include <utility>
#include "eval.h"
namespace engine {

    class Score {
    public:
        struct Mate {
            int plies;
        };

        struct Tablebase {
            int  plies;
            bool win;
        };

        struct InternalUnits {
            int value;
        };

        Score() = default;
        Score(Value v);

        template<typename T>
        bool is() const {
            return std::holds_alternative<T>(score);
        }

        template<typename T>
        T get() const {
            return std::get<T>(score);
        }

        template<typename F>
        decltype(auto) visit(F &&f) const {
            return std::visit(std::forward<F>(f), score);
        }

    private:
        std::variant<Mate, Tablebase, InternalUnits> score;
    };

}

#endif  // #ifndef SCORE_H_INCLUDED