X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=6f3a0048226eb620e6e9c07d9c4185145ad27b68;hp=7a39a5009c5571ccf0ef68b5d90792acc353de9b;hb=553655eb073cdd59c726dd77fcf368d499029467;hpb=7b4b65d7a95b3c8b40a11fe5b3efe959d5129008

diff --git a/src/bitboard.h b/src/bitboard.h
index 7a39a500..6f3a0048 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -57,11 +57,19 @@ inline Bitboard operator&(Bitboard b, Square s) {
 }
 
 inline Bitboard& operator|=(Bitboard& b, Square s) {
-  return b |= SquareBB[s], b;
+  return b |= SquareBB[s];
 }
 
 inline Bitboard& operator^=(Bitboard& b, Square s) {
-  return b ^= SquareBB[s], b;
+  return b ^= SquareBB[s];
+}
+
+inline Bitboard operator|(Bitboard b, Square s) {
+  return b | SquareBB[s];
+}
+
+inline Bitboard operator^(Bitboard b, Square s) {
+  return b ^ SquareBB[s];
 }
 
 
@@ -199,6 +207,14 @@ inline Bitboard same_color_squares(Square s) {
 }
 
 
+/// single_bit() returns true if in the 'b' bitboard is set a single bit (or if
+/// b == 0).
+
+inline bool single_bit(Bitboard b) {
+  return !(b & (b - 1));
+}
+
+
 /// 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.