X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=3afbeedfbab42ee086000de51a4964350b34bea5;hp=859fc958c88f60b8c88d4375fe1f53503ac3be7b;hb=49e110c52b19f5c99954d4797b8e991b0b60007c;hpb=2067a99c070891faaa6239371ca882b54065f0cc

diff --git a/src/bitboard.h b/src/bitboard.h
index 859fc958..3afbeedf 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -82,7 +82,7 @@ extern Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
 
 extern int SquareDistance[SQUARE_NB][SQUARE_NB];
 
-const Bitboard BlackSquares = 0xAA55AA55AA55AA55ULL;
+const Bitboard DarkSquares = 0xAA55AA55AA55AA55ULL;
 
 /// Overloads of bitwise operators between a Bitboard and a Square for testing
 /// whether a given bit is set in a bitboard, and for setting and clearing bits.
@@ -214,6 +214,14 @@ inline Bitboard passed_pawn_mask(Color c, Square s) {
 }
 
 
+/// squares_of_color() returns a bitboard representing all squares with the same
+/// color of the given square.
+
+inline Bitboard squares_of_color(Square s) {
+  return DarkSquares & s ? DarkSquares : ~DarkSquares;
+}
+
+
 /// squares_aligned() returns true if the squares s1, s2 and s3 are aligned
 /// either on a straight or on a diagonal line.
 
@@ -223,14 +231,6 @@ 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 BlackSquares & s ? BlackSquares : ~BlackSquares;
-}
-
-
 /// Functions for computing sliding attack bitboards. Function attacks_bb() takes
 /// a square and a bitboard of occupied squares as input, and returns a bitboard
 /// representing all squares attacked by Pt (bishop or rook) on the given square.
@@ -319,4 +319,10 @@ extern Square pop_lsb(Bitboard* b);
 
 #endif
 
+/// frontmost_sq() and backmost_sq() find the square corresponding to the
+/// most/least advanced bit relative to the given color.
+
+inline Square frontmost_sq(Color c, Bitboard b) { return c == WHITE ? msb(b) : lsb(b); }
+inline Square  backmost_sq(Color c, Bitboard b) { return c == WHITE ? lsb(b) : msb(b); }
+
 #endif // #ifndef BITBOARD_H_INCLUDED