Introduce king infiltration bonus

[stockfish] / src / endgame.h

diff --git a/src/endgame.h b/src/endgame.h
index 3d61207c419c13027efda92cddf29dc147de4bf8..e29f877782cd6c67501d751394cbc3f599c5dd7b 100644 (file)
--- a/src/endgame.h
+++ b/src/endgame.h
@@ -2,7 +2,7 @@
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2015-2019 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 +21,7 @@
 #ifndef ENDGAME_H_INCLUDED
 #define ENDGAME_H_INCLUDED
 
-#include <map>
+#include <unordered_map>
 #include <memory>
 #include <string>
 #include <type_traits>
@@ -37,6 +37,7 @@ enum EndgameCode {
 
   EVALUATION_FUNCTIONS,
   KNNK,  // KNN vs K
+  KNNKP, // KNN vs KP
   KXK,   // Generic "mate lone king" eval
   KBNK,  // KBN vs K
   KPK,   // KP vs K
@@ -64,6 +65,7 @@ enum EndgameCode {
 
 /// Endgame functions can be of two types depending on whether they return a
 /// Value or a ScaleFactor.
+
 template<EndgameCode E> using
 eg_type = typename std::conditional<(E < SCALING_FUNCTIONS), Value, ScaleFactor>::type;
 
@@ -89,37 +91,37 @@ struct Endgame : public EndgameBase<T> {
 };
 
 
-/// The Endgames class stores the pointers to endgame evaluation and scaling
+/// The Endgames namespace handles the pointers to endgame evaluation and scaling
 /// base objects in two std::map. We use polymorphism to invoke the actual
 /// endgame function by calling its virtual operator().
 
-class Endgames {
+namespace Endgames {
 
   template<typename T> using Ptr = std::unique_ptr<EndgameBase<T>>;
-  template<typename T> using Map = std::map<Key, Ptr<T>>;
+  template<typename T> using Map = std::unordered_map<Key, Ptr<T>>;
+
+  extern std::pair<Map<Value>, Map<ScaleFactor>> maps;
+
+  void init();
 
   template<typename T>
   Map<T>& map() {
     return std::get<std::is_same<T, ScaleFactor>::value>(maps);
   }
 
-  template<EndgameCode E, typename T = eg_type<E>, typename P = Ptr<T>>
+  template<EndgameCode E, typename T = eg_type<E>>
   void add(const std::string& code) {
 
     StateInfo st;
-    map<T>()[Position().set(code, WHITE, &st).material_key()] = P(new Endgame<E>(WHITE));
-    map<T>()[Position().set(code, BLACK, &st).material_key()] = P(new Endgame<E>(BLACK));
+    map<T>()[Position().set(code, WHITE, &st).material_key()] = Ptr<T>(new Endgame<E>(WHITE));
+    map<T>()[Position().set(code, BLACK, &st).material_key()] = Ptr<T>(new Endgame<E>(BLACK));
   }
 
-  std::pair<Map<Value>, Map<ScaleFactor>> maps;
-
-public:
-  Endgames();
-
   template<typename T>
-  EndgameBase<T>* probe(Key key) {
-    return map<T>().count(key) ? map<T>()[key].get() : nullptr;
+  const EndgameBase<T>* probe(Key key) {
+    auto it = map<T>().find(key);
+    return it != map<T>().end() ? it->second.get() : nullptr;
   }
-};
+}
 
 #endif // #ifndef ENDGAME_H_INCLUDED