X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fendgame.h;h=509e8d4caac7fabc8589836d9c97fc89c7015027;hp=c3d5dd03b6373ee3cb7d382e3245d25d0154d665;hb=0868de705df796b9b9803bd393f4f27c3f4ed772;hpb=df201175c6a0704800b1578e338c6e2a202234fe

diff --git a/src/endgame.h b/src/endgame.h
index c3d5dd03..509e8d4c 100644
--- a/src/endgame.h
+++ b/src/endgame.h
@@ -1,7 +1,8 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2015-2017 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
@@ -21,7 +22,10 @@
 #define ENDGAME_H_INCLUDED
 
 #include <map>
+#include <memory>
 #include <string>
+#include <type_traits>
+#include <utility>
 
 #include "position.h"
 #include "types.h"
@@ -45,7 +49,7 @@ enum EndgameType {
 
 
   // Scaling functions
-  SCALE_FUNS,
+  SCALING_FUNCTIONS,
 
   KBPsK,   // KB and pawns vs K
   KQKRPs,  // KQ vs KR and pawns
@@ -63,11 +67,9 @@ enum EndgameType {
 
 
 /// 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<int> struct eg_fun { typedef Value type; };
-template<> struct eg_fun<1> { typedef ScaleFactor type; };
+/// Value or a ScaleFactor.
+template<EndgameType E> using
+eg_type = typename std::conditional<(E < SCALING_FUNCTIONS), Value, ScaleFactor>::type;
 
 
 /// Base and derived templates for endgame evaluation and scaling functions
@@ -75,47 +77,49 @@ template<> struct eg_fun<1> { typedef ScaleFactor type; };
 template<typename T>
 struct EndgameBase {
 
-  virtual ~EndgameBase() {}
-  virtual Color color() const = 0;
+  virtual ~EndgameBase() = default;
+  virtual Color strong_side() const = 0;
   virtual T operator()(const Position&) const = 0;
 };
 
 
-template<EndgameType E, typename T = typename eg_fun<(E > SCALE_FUNS)>::type>
+template<EndgameType E, typename T = eg_type<E>>
 struct Endgame : public EndgameBase<T> {
 
   explicit Endgame(Color c) : strongSide(c), weakSide(~c) {}
-  Color color() const { return strongSide; }
+  Color strong_side() const { return strongSide; }
   T operator()(const Position&) const;
 
 private:
-  const Color strongSide, weakSide;
+  Color strongSide, weakSide;
 };
 
 
 /// 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().
+/// base objects in two std::map. We use polymorphism to invoke the actual
+/// endgame function by calling its virtual operator().
 
 class Endgames {
 
-  typedef std::map<Key, EndgameBase<eg_fun<0>::type>*> M1;
-  typedef std::map<Key, EndgameBase<eg_fun<1>::type>*> M2;
+  template<typename T> using Map = std::map<Key, std::unique_ptr<EndgameBase<T>>>;
 
-  M1 m1;
-  M2 m2;
+  template<EndgameType E, typename T = eg_type<E>>
+  void add(const std::string& code);
 
-  M1& map(M1::mapped_type) { return m1; }
-  M2& map(M2::mapped_type) { return m2; }
+  template<typename T>
+  Map<T>& map() {
+    return std::get<std::is_same<T, ScaleFactor>::value>(maps);
+  }
 
-  template<EndgameType E> void add(const std::string& code);
+  std::pair<Map<Value>, Map<ScaleFactor>> maps;
 
 public:
   Endgames();
- ~Endgames();
 
-  template<typename T> T probe(Key key, T& eg)
-  { return eg = map(eg).count(key) ? map(eg)[key] : NULL; }
+  template<typename T>
+  EndgameBase<T>* probe(Key key) {
+    return map<T>().count(key) ? map<T>()[key].get() : nullptr;
+  }
 };
 
 #endif // #ifndef ENDGAME_H_INCLUDED