+++ /dev/null
-/*
- Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
- Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
-
- 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 ENDGAME_H_INCLUDED
-#define ENDGAME_H_INCLUDED
-
-#include <map>
-#include <memory>
-#include <string>
-#include <type_traits>
-#include <utility>
-
-#include "position.h"
-#include "types.h"
-
-
-/// EndgameCode lists all supported endgame functions by corresponding codes
-
-enum EndgameCode {
-
- EVALUATION_FUNCTIONS,
- KNNK, // KNN vs K
- KXK, // Generic "mate lone king" eval
- KBNK, // KBN vs K
- KPK, // KP vs K
- KRKP, // KR vs KP
- KRKB, // KR vs KB
- KRKN, // KR vs KN
- KQKP, // KQ vs KP
- KQKR, // KQ vs KR
-
- SCALING_FUNCTIONS,
- KBPsK, // KB and pawns vs K
- KQKRPs, // KQ vs KR and pawns
- KRPKR, // KRP vs KR
- KRPKB, // KRP vs KB
- KRPPKRP, // KRPP vs KRP
- KPsK, // K and pawns vs K
- KBPKB, // KBP vs KB
- KBPPKB, // KBPP vs KB
- KBPKN, // KBP vs KN
- KNPK, // KNP vs K
- KNPKB, // KNP vs KB
- KPKP // KP vs KP
-};
-
-
-/// Endgame functions can be of two types depending on whether they return a
-/// Value or a ScaleFactor.
-
-template<EndgameCode E> using
-eg_type = typename std::conditional<(E < SCALING_FUNCTIONS), Value, ScaleFactor>::type;
-
-
-/// Base and derived functors for endgame evaluation and scaling functions
-
-template<typename T>
-struct EndgameBase {
-
- explicit EndgameBase(Color c) : strongSide(c), weakSide(~c) {}
- virtual ~EndgameBase() = default;
- virtual T operator()(const Position&) const = 0;
-
- const Color strongSide, weakSide;
-};
-
-
-template<EndgameCode E, typename T = eg_type<E>>
-struct Endgame : public EndgameBase<T> {
-
- explicit Endgame(Color c) : EndgameBase<T>(c) {}
- T operator()(const Position&) const override;
-};
-
-
-/// The Endgames class stores the pointers to endgame evaluation and scaling
-/// base objects in two std::map. We use polymorphism to invoke the actual
-/// endgame function by calling its virtual operator().
-
-class Endgames {
-
- template<typename T> using Ptr = std::unique_ptr<EndgameBase<T>>;
- template<typename T> using Map = std::map<Key, Ptr<T>>;
-
- template<typename T>
- Map<T>& map() {
- return std::get<std::is_same<T, ScaleFactor>::value>(maps);
- }
-
- template<EndgameCode E, typename T = eg_type<E>>
- void add(const std::string& code) {
-
- StateInfo st;
- map<T>()[Position().set(code, WHITE, &st).material_key()] = Ptr<T>(new Endgame<E>(WHITE));
- map<T>()[Position().set(code, BLACK, &st).material_key()] = Ptr<T>(new Endgame<E>(BLACK));
- }
-
- std::pair<Map<Value>, Map<ScaleFactor>> maps;
-
-public:
- Endgames() {
-
- add<KPK>("KPK");
- add<KNNK>("KNNK");
- add<KBNK>("KBNK");
- add<KRKP>("KRKP");
- add<KRKB>("KRKB");
- add<KRKN>("KRKN");
- add<KQKP>("KQKP");
- add<KQKR>("KQKR");
-
- add<KNPK>("KNPK");
- add<KNPKB>("KNPKB");
- add<KRPKR>("KRPKR");
- add<KRPKB>("KRPKB");
- add<KBPKB>("KBPKB");
- add<KBPKN>("KBPKN");
- add<KBPPKB>("KBPPKB");
- add<KRPPKRP>("KRPPKRP");
- }
-
- template<typename T>
- const EndgameBase<T>* probe(Key key) {
- return map<T>().count(key) ? map<T>()[key].get() : nullptr;
- }
-};
-
-#endif // #ifndef ENDGAME_H_INCLUDED