Silence idiotic warning on two's complement of an unsigned

[stockfish] / src / position.cpp

diff --git a/src/position.cpp b/src/position.cpp
index 1081e1da9e723e1e4834fa23ce0f8437f8b4c09c..cdbd9f0d1963ff13486c986c401e340e1c960d03 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1618,7 +1618,7 @@ int Position::see(Square from, Square to) const {
       // Remove the attacker we just found from the 'attackers' bitboard,
       // and scan for new X-ray attacks behind the attacker.
       b = attackers & pieces_of_color_and_type(c, pt);
-      occ ^= (b & -b);
+      occ ^= (b & (~b + 1));
       attackers |=  (rook_attacks_bb(to, occ) & rooks_and_queens())
                   | (bishop_attacks_bb(to, occ) & bishops_and_queens());