Avoid using EmptySearchStack global

[stockfish] / src / movepick.h

diff --git a/src/movepick.h b/src/movepick.h
index 17df8678928921172646d8c8d9ed9ca0009b1643..56efb321aedf238a7d8b1ae52ca1e1e26f037f58 100644 (file)
--- a/src/movepick.h
+++ b/src/movepick.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 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
@@ -38,8 +38,8 @@ struct EvalInfo;
 struct SearchStack;
 
 /// MovePicker is a class which is used to pick one legal move at a time from
-/// the current position.  It is initialized with a Position object and a few
-/// moves we have reason to believe are good.  The most important method is
+/// the current position. It is initialized with a Position object and a few
+/// moves we have reason to believe are good. The most important method is
 /// MovePicker::pick_next_move(), which returns a new legal move each time it
 /// is called, until there are no legal moves left, when MOVE_NONE is returned.
 /// In order to improve the efficiency of the alpha beta algorithm, MovePicker
@@ -47,7 +47,7 @@ struct SearchStack;
 
 class MovePicker {
 
-  MovePicker& operator=(const MovePicker&); // Silence a warning under MSVC
+  MovePicker& operator=(const MovePicker&); // silence a warning under MSVC
 
 public:
 
@@ -55,21 +55,19 @@ public:
     PH_TT_MOVE,        // Transposition table move
     PH_MATE_KILLER,    // Mate killer from the current ply
     PH_GOOD_CAPTURES,  // Queen promotions and captures with SEE values >= 0
-    PH_BAD_CAPTURES,   // Queen promotions and captures with SEE values < 0
-    PH_KILLER_1,       // Killer move 1 from the current ply (not used yet).
-    PH_KILLER_2,       // Killer move 2 from the current ply (not used yet).
+    PH_KILLERS,        // Killer moves from the current ply
     PH_NONCAPTURES,    // Non-captures and underpromotions
+    PH_BAD_CAPTURES,   // Queen promotions and captures with SEE values < 0
     PH_EVASIONS,       // Check evasions
     PH_QCAPTURES,      // Captures in quiescence search
-    PH_QCHECKS,        // Checks in quiescence search
+    PH_QCHECKS,        // Non-capture checks in quiescence search
     PH_STOP
   };
 
-  MovePicker(const Position& p, bool pvnode, Move ttm, const SearchStack& ss, Depth d);
+  MovePicker(const Position& p, bool pvnode, Move ttm, Depth d, SearchStack* ss = NULL);
   Move get_next_move();
-  Move get_next_move(Lock &lock);
+  Move get_next_move(Lock& lock);
   int number_of_moves() const;
-  int current_move_score() const;
   Bitboard discovered_check_candidates() const;
 
   static void init_phase_table();
@@ -90,6 +88,7 @@ private:
   int phaseIndex;
   int numOfMoves, numOfBadCaptures;
   int movesPicked;
+  bool checkKillers, checkLegal;
   bool finished;
 };
 
@@ -108,7 +107,7 @@ inline int MovePicker::number_of_moves() const {
 }
 
 /// MovePicker::discovered_check_candidates() returns a bitboard containing
-/// all pieces which can possibly give discovered check.  This bitboard is
+/// all pieces which can possibly give discovered check. This bitboard is
 /// computed by the constructor function.
 
 inline Bitboard MovePicker::discovered_check_candidates() const {