/*
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) 2008-2009 Marco Costalba
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/>.
*/
//// 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;
+enum EndgameType {
+
+ // 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
+ 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
+ KBPPKB, // KBPP vs KB
+ KBPKN, // KBP vs KN
+ KNPK, // KNP vs K
+ KPKP // KP vs KP
+};
+
+/// Template abstract base class for all special endgame functions
+
+template<typename T>
+class EndgameFunctionBase {
+public:
+ EndgameFunctionBase(Color c) : strongerSide(c), weakerSide(opposite_color(c)) {}
+ virtual ~EndgameFunctionBase() {}
+ virtual T apply(const Position&) = 0;
protected:
Color strongerSide, weakerSide;
};
-
-/// Subclasses for various concrete endgames:
-
-// Generic "mate lone king" eval:
-class KXKEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KXKEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KBN vs K:
-class KBNKEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KBNKEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KP vs K:
-class KPKEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KPKEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KR vs KP:
-class KRKPEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KRKPEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KR vs KB:
-class KRKBEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KRKBEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KR vs KN:
-class KRKNEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KRKNEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KQ vs KR:
-class KQKREvaluationFunction : public EndgameEvaluationFunction {
-public:
- KQKREvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
-
-// KBB vs KN:
-class KBBKNEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KBBKNEvaluationFunction(Color C);
- Value apply(const Position &pos);
-};
-
-// K and two minors vs K and one or two minors:
-class KmmKmEvaluationFunction : public EndgameEvaluationFunction {
-public:
- KmmKmEvaluationFunction(Color c);
- Value apply(const Position &pos);
-};
+typedef EndgameFunctionBase<Value> EndgameEvaluationFunctionBase;
+typedef EndgameFunctionBase<ScaleFactor> EndgameScalingFunctionBase;
-/// Abstract base class for all evaluation scaling functions:
+/// Templates subclass for various concrete endgames
-class ScalingFunction {
-public:
- ScalingFunction(Color c);
- virtual ~ScalingFunction() { }
-
- virtual ScaleFactor apply(const Position &pos) =0;
-
-protected:
- Color strongerSide, weakerSide;
+template<EndgameType>
+struct EvaluationFunction : public EndgameEvaluationFunctionBase {
+ explicit EvaluationFunction(Color c): EndgameEvaluationFunctionBase(c) {}
+ Value apply(const Position&);
};
-
-/// 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);
+template<EndgameType>
+struct ScalingFunction : public EndgameScalingFunctionBase {
+ explicit ScalingFunction(Color c) : EndgameScalingFunctionBase(c) {}
+ ScaleFactor apply(const Position&);
};
-// 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);
-};
-
-// 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);
-};
-
-// KP vs KP:
-class KPKPScalingFunction : public ScalingFunction {
-public:
- KPKPScalingFunction(Color c);
- ScaleFactor apply(const Position &pos);
-};
-
-
-////
-//// Constants and variables
-////
-
-// Generic "mate lone king" eval:
-extern KXKEvaluationFunction EvaluateKXK, EvaluateKKX;
-
-// KBN vs K:
-extern KBNKEvaluationFunction EvaluateKBNK, EvaluateKKBN;
-
-// KP vs K:
-extern KPKEvaluationFunction EvaluateKPK, EvaluateKKP;
-
-// KR vs KP:
-extern KRKPEvaluationFunction EvaluateKRKP, EvaluateKPKR;
-
-// KR vs KB:
-extern KRKBEvaluationFunction EvaluateKRKB, EvaluateKBKR;
-
-// KR vs KN:
-extern KRKNEvaluationFunction EvaluateKRKN, EvaluateKNKR;
-
-// KQ vs KR:
-extern KQKREvaluationFunction EvaluateKQKR, EvaluateKRKQ;
-
-// KBB vs KN:
-extern KBBKNEvaluationFunction EvaluateKBBKN, EvaluateKNKBB;
-
-// K and two minors vs K and one or two minors:
-extern KmmKmEvaluationFunction EvaluateKmmKm;
-
-// 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
projects / stockfish / blobdiff