X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fendgame.h;h=681b379f6341c74f5a98c897b613bd96f71ada31;hp=195c2365cbe2e6aac15377428e8e28b05109b2a3;hb=c9dcda6ac488c0058ebd567e1f52e30b8cd0db20;hpb=6963c3802d73c61396af32eb7fc6a4e4a76763ae

diff --git a/src/endgame.h b/src/endgame.h
index 195c2365..681b379f 100644
--- a/src/endgame.h
+++ b/src/endgame.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2014 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
@@ -17,11 +17,11 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#if !defined(ENDGAME_H_INCLUDED)
+#ifndef ENDGAME_H_INCLUDED
 #define ENDGAME_H_INCLUDED
 
-#include <string>
 #include <map>
+#include <string>
 
 #include "position.h"
 #include "types.h"
@@ -33,39 +33,43 @@ enum EndgameType {
 
   // 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
   KBBKN, // KBB vs KN
-  KNNK,  // KNN vs K
   KmmKm, // K and two minors vs K and one or two minors
 
 
   // Scaling functions
   SCALE_FUNS,
 
-  KBPsK,   // KB+pawns vs K
-  KQKRPs,  // KQ vs KR+pawns
+  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,    // King and pawns vs king
+  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
 };
 
 
-/// Some magic to detect family type of endgame from its enum value
+/// Endgame functions can be of two types depending on whether they return a
+/// Value or a ScaleFactor. Type eg_fun<int>::type returns either ScaleFactor
+/// or Value depending on whether the template parameter is 0 or 1.
 
-template<bool> struct bool_to_type { typedef Value type; };
-template<> struct bool_to_type<true> { typedef ScaleFactor type; };
-template<EndgameType E> struct eg_family : public bool_to_type<(E > SCALE_FUNS)> {};
+template<int> struct eg_fun { typedef Value type; };
+template<> struct eg_fun<1> { typedef ScaleFactor type; };
 
 
 /// Base and derived templates for endgame evaluation and scaling functions
@@ -75,43 +79,45 @@ struct EndgameBase {
 
   virtual ~EndgameBase() {}
   virtual Color color() const = 0;
-  virtual T apply(const Position&) const = 0;
+  virtual T operator()(const Position&) const = 0;
 };
 
 
-template<EndgameType E, typename T = typename eg_family<E>::type>
+template<EndgameType E, typename T = typename eg_fun<(E > SCALE_FUNS)>::type>
 struct Endgame : public EndgameBase<T> {
 
-  explicit Endgame(Color c) : strongerSide(c), weakerSide(opposite_color(c)) {}
-  Color color() const { return strongerSide; }
-  T apply(const Position&) const;
+  explicit Endgame(Color c) : strongSide(c), weakSide(~c) {}
+  Color color() const { return strongSide; }
+  T operator()(const Position&) const;
 
 private:
-  Color strongerSide, weakerSide;
+  const Color strongSide, weakSide;
 };
 
 
-/// 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.
+/// The Endgames class stores the pointers to endgame evaluation and scaling
+/// base objects in two std::map typedefs. We then use polymorphism to invoke
+/// the actual endgame function by calling its virtual operator().
 
-struct Endgames {
+class Endgames {
 
-  template<typename T>
-  struct EMap { typedef std::map<Key, EndgameBase<T>*> type; };
+  typedef std::map<Key, EndgameBase<eg_fun<0>::type>*> M1;
+  typedef std::map<Key, EndgameBase<eg_fun<1>::type>*> M2;
 
-  Endgames();
-  ~Endgames();
-  template<typename T> EndgameBase<T>* get(Key key) const;
+  M1 m1;
+  M2 m2;
 
-private:
-  template<EndgameType E> void add(const std::string& keyCode);
+  M1& map(M1::mapped_type) { return m1; }
+  M2& map(M2::mapped_type) { return m2; }
 
-  // Here we store two maps, for evaluate and scaling functions...
-  std::pair<EMap<Value>::type, EMap<ScaleFactor>::type> maps;
+  template<EndgameType E> void add(const std::string& code);
+
+public:
+  Endgames();
+ ~Endgames();
 
-  // ...and here is the accessing template function
-  template<typename T> const typename EMap<T>::type& map() const;
+  template<typename T> T probe(Key key, T& eg)
+  { return eg = map(eg).count(key) ? map(eg)[key] : NULL; }
 };
 
-#endif // !defined(ENDGAME_H_INCLUDED)
+#endif // #ifndef ENDGAME_H_INCLUDED