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Stockfish, a UCI chess playing engine derived from Glaurung 2.1

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 "eval.h"

#include <utility>

#include <variant>

namespace engine {

class Score {

public:

struct Mate {

int plies;

};

struct Tablebase {

int plies;

bool win;

};

struct InternalUnits {

int value;

};

Score() : score(InternalUnits{ VALUE_ZERO }) {};

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;

};

} // namespace engine

#endif // #ifndef SCORE_H_INCLUDED