/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008 Marco Costalba
+ Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, 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
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
#if !defined(ENDGAME_H_INCLUDED)
#define ENDGAME_H_INCLUDED
-////
-//// Includes
-////
+#include <string>
+#include <map>
#include "position.h"
-#include "scale.h"
-#include "value.h"
-
-
-////
-//// Types
-////
+#include "types.h"
-/// Abstract base class for all special endgame evaluation functions
-class EndgameEvaluationFunction {
-public:
- EndgameEvaluationFunction(Color c);
- virtual ~EndgameEvaluationFunction() { }
+/// EndgameType lists all supported endgames
- virtual Value apply(const Position &pos) = 0;
+enum EndgameType {
-protected:
- Color strongerSide, weakerSide;
+ // Evaluation functions
+
+ 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
+ KQKR, // KQ vs KR
+ KBBKN, // KBB vs KN
+ KNNK, // KNN vs K
+ KmmKm, // K and two minors vs K and one or two minors
+
+
+ // Scaling functions
+
+ KBPsK, // KB+pawns vs K
+ KQKRPs, // KQ vs KR+pawns
+ KRPKR, // KRP vs KR
+ KRPPKRP, // KRPP vs KRP
+ KPsK, // King and pawns vs king
+ KBPKB, // KBP vs KB
+ KBPPKB, // KBPP vs KB
+ KBPKN, // KBP vs KN
+ KNPK, // KNP vs K
+ KPKP // KP vs KP
};
-/// Template subclass for various concrete endgames
+/// Base and derived templates for endgame evaluation and scaling functions
-enum EndgameType {
- 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
- KQKR, // KQ vs KR
- KBBKN, // KBB vs KN
- KmmKm // K and two minors vs K and one or two minors
-};
+template<typename T>
+struct EndgameBase {
-template<EndgameType>
-class EvaluationFunction : public EndgameEvaluationFunction {
-public:
- explicit EvaluationFunction(Color c): EndgameEvaluationFunction(c) {}
- Value apply(const Position& pos);
+ typedef EndgameBase<T> Base;
+
+ virtual ~EndgameBase() {}
+ virtual Color color() const = 0;
+ virtual T apply(const Position&) const = 0;
};
-/// Abstract base class for all evaluation scaling functions:
-class ScalingFunction {
-public:
- ScalingFunction(Color c);
- virtual ~ScalingFunction() { }
+template<typename T, EndgameType>
+struct Endgame : public EndgameBase<T> {
- virtual ScaleFactor apply(const Position &pos) =0;
+ explicit Endgame(Color c) : strongerSide(c), weakerSide(opposite_color(c)) {}
+ Color color() const { return strongerSide; }
+ T apply(const Position&) const;
-protected:
+private:
Color strongerSide, weakerSide;
};
-/// Subclasses for various concrete endgames:
+/// Endgames class stores in two std::map the pointers to endgame evaluation
+/// and scaling base objects. Then we use polymorphism to invoke the actual
+/// endgame function calling its apply() method that is virtual.
-// KBP vs K:
-class KBPKScalingFunction : public ScalingFunction {
-public:
- KBPKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KQ vs KRP:
-class KQKRPScalingFunction: public ScalingFunction {
-public:
- KQKRPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+class Endgames {
-// KRP vs KR:
-class KRPKRScalingFunction : public ScalingFunction {
-public:
- KRPKRScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KRPP vs KRP:
-class KRPPKRPScalingFunction : public ScalingFunction {
-public:
- KRPPKRPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// King and pawns vs king:
-class KPsKScalingFunction : public ScalingFunction {
-public:
- KPsKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+ typedef std::map<Key, EndgameBase<Value>* > EFMap;
+ typedef std::map<Key, EndgameBase<ScaleFactor>* > SFMap;
-// KBP vs KB:
-class KBPKBScalingFunction : public ScalingFunction {
public:
- KBPKBScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+ Endgames();
+ ~Endgames();
+ template<class T> T* get(Key key) const;
-// KBP vs KN:
-class KBPKNScalingFunction : public ScalingFunction {
-public:
- KBPKNScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+private:
+ template<class T> void add(const std::string& keyCode);
-// KNP vs K:
-class KNPKScalingFunction : public ScalingFunction {
-public:
- KNPKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+ // Here we store two maps, for evaluate and scaling functions...
+ std::pair<EFMap, SFMap> maps;
-// KP vs KP:
-class KPKPScalingFunction : public ScalingFunction {
-public:
- KPKPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
+ // ...and here is the accessing template function
+ template<typename T> const std::map<Key, T*>& get() const;
};
-
-////
-//// Constants and variables
-////
-
-extern EvaluationFunction<KXK> EvaluateKXK, EvaluateKKX; // Generic "mate lone king" eval
-extern EvaluationFunction<KBNK> EvaluateKBNK, EvaluateKKBN; // KBN vs K
-extern EvaluationFunction<KPK> EvaluateKPK, EvaluateKKP; // KP vs K
-extern EvaluationFunction<KRKP> EvaluateKRKP, EvaluateKPKR; // KR vs KP
-extern EvaluationFunction<KRKB> EvaluateKRKB, EvaluateKBKR; // KR vs KB
-extern EvaluationFunction<KRKN> EvaluateKRKN, EvaluateKNKR; // KR vs KN
-extern EvaluationFunction<KQKR> EvaluateKQKR, EvaluateKRKQ; // KQ vs KR
-extern EvaluationFunction<KBBKN> EvaluateKBBKN, EvaluateKNKBB; // KBB vs KN
-extern EvaluationFunction<KmmKm> EvaluateKmmKm; // K and two minors vs K and one or two minors:
-
-// KBP vs K:
-extern KBPKScalingFunction ScaleKBPK, ScaleKKBP;
-
-// KQ vs KRP:
-extern KQKRPScalingFunction ScaleKQKRP, ScaleKRPKQ;
-
-// KRP vs KR:
-extern KRPKRScalingFunction ScaleKRPKR, ScaleKRKRP;
-
-// KRPP vs KRP:
-extern KRPPKRPScalingFunction ScaleKRPPKRP, ScaleKRPKRPP;
-
-// King and pawns vs king:
-extern KPsKScalingFunction ScaleKPsK, ScaleKKPs;
-
-// KBP vs KB:
-extern KBPKBScalingFunction ScaleKBPKB, ScaleKBKBP;
-
-// KBP vs KN:
-extern KBPKNScalingFunction ScaleKBPKN, ScaleKNKBP;
-
-// KNP vs K:
-extern KNPKScalingFunction ScaleKNPK, ScaleKKNP;
-
-// KP vs KP:
-extern KPKPScalingFunction ScaleKPKPw, ScaleKPKPb;
-
-
-////
-//// Prototypes
-////
-
-extern void init_bitbases();
-
-
#endif // !defined(ENDGAME_H_INCLUDED)