Stockfish 2.2

[stockfish] / src / bitboard.h

diff --git a/src/bitboard.h b/src/bitboard.h
index 8366827804dea8a87afa2aaae09aa73ffb9ea79a..cb4c9fad5781515dc6d2474bd3a3e93250562ddd 100644 (file)
--- a/src/bitboard.h
+++ b/src/bitboard.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) 2008-2012 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
@@ -23,7 +23,6 @@
 
 #include "types.h"
 
-extern Bitboard SquaresByColorBB[2];
 extern Bitboard FileBB[8];
 extern Bitboard NeighboringFilesBB[8];
 extern Bitboard ThisAndNeighboringFilesBB[8];
@@ -226,6 +225,15 @@ inline bool squares_aligned(Square s1, Square s2, Square s3) {
 }
 
 
+/// same_color_squares() returns a bitboard representing all squares with
+/// the same color of the given square.
+
+inline Bitboard same_color_squares(Square s) {
+  return bit_is_set(0xAA55AA55AA55AA55ULL, s) ?  0xAA55AA55AA55AA55ULL
+                                              : ~0xAA55AA55AA55AA55ULL;
+}
+
+
 /// first_1() finds the least significant nonzero bit in a nonzero bitboard.
 /// pop_1st_bit() finds and clears the least significant nonzero bit in a
 /// nonzero bitboard.