//// Types
////
-/// Abstract base class for all special endgame evaluation functions
-
-class EndgameEvaluationFunction {
-public:
- EndgameEvaluationFunction(Color c);
- virtual ~EndgameEvaluationFunction() { }
-
- virtual Value apply(const Position &pos) = 0;
-
-protected:
- Color strongerSide, weakerSide;
-};
-
-
-/// Template subclass for various concrete endgames
-
enum EndgameType {
+
+ // Evaluation functions
KXK, // Generic "mate lone king" eval
KBNK, // KBN vs K
KPK, // KP vs K
KRKN, // KR vs KN
KQKR, // KQ vs KR
KBBKN, // KBB vs KN
- KmmKm // K and two minors vs K and one or two minors
+ KmmKm, // K and two minors vs K and one or two minors
+
+ // Scaling functions
+ KBPK, // KBP vs K
+ KQKRP, // KQ vs KRP
+ KRPKR, // KRP vs KR
+ KRPPKRP, // KRPP vs KRP
+ KPsK, // King and pawns vs king
+ KBPKB, // KBP vs KB
+ KBPKN, // KBP vs KN
+ KNPK, // KNP vs K
+ KPKP // KP vs KP
};
-template<EndgameType>
-class EvaluationFunction : public EndgameEvaluationFunction {
-public:
- explicit EvaluationFunction(Color c): EndgameEvaluationFunction(c) {}
- Value apply(const Position& pos);
-};
-
-/// Abstract base class for all evaluation scaling functions:
+/// Template abstract base class for all special endgame functions
-class ScalingFunction {
+template<typename T>
+class EndgameFunctionBase {
public:
- ScalingFunction(Color c);
- virtual ~ScalingFunction() { }
-
- virtual ScaleFactor apply(const Position &pos) =0;
+ EndgameFunctionBase(Color c) : strongerSide(c) { weakerSide = opposite_color(strongerSide); }
+ virtual ~EndgameFunctionBase() {}
+ virtual T apply(const Position&) = 0;
protected:
Color strongerSide, weakerSide;
};
+typedef EndgameFunctionBase<Value> EndgameEvaluationFunctionBase;
+typedef EndgameFunctionBase<ScaleFactor> EndgameScalingFunctionBase;
-/// Subclasses for various concrete endgames:
-
-// 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);
-};
-// KRP vs KR:
-class KRPKRScalingFunction : public ScalingFunction {
-public:
- KRPKRScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
+/// Templates subclass for various concrete endgames
-// 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);
-};
-
-// KBP vs KB:
-class KBPKBScalingFunction : public ScalingFunction {
-public:
- KBPKBScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KBP vs KN:
-class KBPKNScalingFunction : public ScalingFunction {
-public:
- KBPKNScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-// KNP vs K:
-class KNPKScalingFunction : public ScalingFunction {
-public:
- KNPKScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
+template<EndgameType>
+struct EvaluationFunction : public EndgameEvaluationFunctionBase {
+ explicit EvaluationFunction(Color c): EndgameEvaluationFunctionBase(c) {}
+ Value apply(const Position&);
};
-// KP vs KP:
-class KPKPScalingFunction : public ScalingFunction {
-public:
- KPKPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
+template<EndgameType>
+struct ScalingFunction : public EndgameScalingFunctionBase {
+ explicit ScalingFunction(Color c) : EndgameScalingFunctionBase(c) {}
+ ScaleFactor apply(const Position&);
};
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;
-
+extern ScalingFunction<KBPK> ScaleKBPK, ScaleKKBP; // KBP vs K
+extern ScalingFunction<KQKRP> ScaleKQKRP, ScaleKRPKQ; // KQ vs KRP
+extern ScalingFunction<KRPKR> ScaleKRPKR, ScaleKRKRP; // KRP vs KR
+extern ScalingFunction<KRPPKRP> ScaleKRPPKRP, ScaleKRPKRPP; // KRPP vs KRP
+extern ScalingFunction<KPsK> ScaleKPsK, ScaleKKPs; // King and pawns vs king
+extern ScalingFunction<KBPKB> ScaleKBPKB, ScaleKBKBP; // KBP vs KB
+extern ScalingFunction<KBPKN> ScaleKBPKN, ScaleKNKBP; // KBP vs KN
+extern ScalingFunction<KNPK> ScaleKNPK, ScaleKKNP; // KNP vs K
+extern ScalingFunction<KPKP> ScaleKPKPw, ScaleKPKPb; // KP vs KP
////
//// Prototypes