Introduce SimpleHash class

[stockfish] / src / material.h

diff --git a/src/material.h b/src/material.h
index 5fbe64050282474f1f50401f0849343e226de6e9..d039dbbf4888eea7ce5ae097fcf10d75ee46e4d3 100644 (file)
--- a/src/material.h
+++ b/src/material.h
@@ -1,18 +1,18 @@
 /*
   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) 2008-2010 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
   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/>.
 */
@@ -27,13 +27,15 @@
 
 #include "endgame.h"
 #include "position.h"
-#include "scale.h"
+#include "tt.h"
 
 
 ////
 //// Types
 ////
 
+const int MaterialTableSize = 1024;
+
 /// MaterialInfo is a class which contains various information about a
 /// material configuration. It contains a material balance evaluation,
 /// a function pointer to a special endgame evaluation function (which in
@@ -49,50 +51,34 @@ class MaterialInfo {
   friend class MaterialInfoTable;
 
 public:
-  Value mg_value() const;
-  Value eg_value() const;
+  Score material_value() const;
   ScaleFactor scale_factor(const Position& pos, Color c) const;
   int space_weight() const;
+  Phase game_phase() const;
   bool specialized_eval_exists() const;
   Value evaluate(const Position& pos) const;
 
 private:
-  void clear();
-  
   Key key;
-  int16_t mgValue;
-  int16_t egValue;
+  int16_t value;
   uint8_t factor[2];
-  EndgameEvaluationFunction* evaluationFunction;
-  ScalingFunction* scalingFunction[2];
-  uint8_t spaceWeight;
+  EndgameEvaluationFunctionBase* evaluationFunction;
+  EndgameScalingFunctionBase* scalingFunction[2];
+  int spaceWeight;
+  Phase gamePhase;
 };
 
-
-/// EndgameFunctions class stores the endgame evaluation functions std::map.
-/// Because STL library is not thread safe even for read access, the maps,
-/// although with identical content, are replicated for each thread. This
-/// is faster then using locks with an unique set of global maps.
-
+/// The MaterialInfoTable class represents a pawn hash table. The most important
+/// method is get_material_info, which returns a pointer to a MaterialInfo object.
 class EndgameFunctions;
 
-
-/// The MaterialInfoTable class represents a pawn hash table. It is basically
-/// just an array of MaterialInfo objects and a few methods for accessing these
-/// objects. The most important method is get_material_info, which looks up a
-/// position in the table and returns a pointer to a MaterialInfo object.
-
-class MaterialInfoTable {
-
+class MaterialInfoTable : public SimpleHash<MaterialInfo, MaterialTableSize> {
 public:
-  MaterialInfoTable(unsigned numOfEntries);
+  MaterialInfoTable();
   ~MaterialInfoTable();
-  void clear();
   MaterialInfo* get_material_info(const Position& pos);
-
+  static Phase game_phase(const Position& pos);
 private:
-  unsigned size;
-  MaterialInfo* entries;
   EndgameFunctions* funcs;
 };
 
@@ -101,35 +87,17 @@ private:
 //// Inline functions
 ////
 
-/// MaterialInfo::mg_value and MaterialInfo::eg_value simply returns the
-/// material balance evaluation for the middle game and the endgame.
 
-inline Value MaterialInfo::mg_value() const {
-
-  return Value(mgValue);
-}
+/// MaterialInfo::material_value simply returns the material balance
+/// evaluation that is independent from game phase.
 
-inline Value MaterialInfo::eg_value() const {
+inline Score MaterialInfo::material_value() const {
 
-  return Value(egValue);
+  return make_score(value, value);
 }
 
-
-/// MaterialInfo::clear() resets a MaterialInfo object to an empty state,
-/// with all slots at their default values.
-
-inline void MaterialInfo::clear() {
-
-  mgValue = egValue = 0;
-  factor[WHITE] = factor[BLACK] = uint8_t(SCALE_FACTOR_NORMAL);
-  spaceWeight = 0;
-  evaluationFunction = NULL;
-  scalingFunction[WHITE] = scalingFunction[BLACK] = NULL;
-}
-
-
 /// MaterialInfo::scale_factor takes a position and a color as input, and
-/// returns a scale factor for the given color.  We have to provide the
+/// returns a scale factor for the given color. We have to provide the
 /// position in addition to the color, because the scale factor need not
 /// to be a constant: It can also be a function which should be applied to
 /// the position. For instance, in KBP vs K endgames, a scaling function
@@ -155,6 +123,14 @@ inline int MaterialInfo::space_weight() const {
   return spaceWeight;
 }
 
+/// MaterialInfo::game_phase() returns the game phase according
+/// to this material configuration.
+
+inline Phase MaterialInfo::game_phase() const {
+
+  return gamePhase;
+}
+
 
 /// MaterialInfo::specialized_eval_exists decides whether there is a
 /// specialized evaluation function for the current material configuration,
@@ -167,7 +143,7 @@ inline bool MaterialInfo::specialized_eval_exists() const {
 
 
 /// MaterialInfo::evaluate applies a specialized evaluation function
-/// to a given position object.  It should only be called when
+/// to a given position object. It should only be called when
 /// specialized_eval_exists() returns 'true'.
 
 inline Value MaterialInfo::evaluate(const Position& pos) const {