Clarify the mapping of files to queenside

[stockfish] / src / types.h

diff --git a/src/types.h b/src/types.h
index 934f884e8fb5b740e3b5f1a40dfcd57560c68b87..6af0368720313d4c8cb7260566a92726f5256daa 100644 (file)
--- a/src/types.h
+++ b/src/types.h
@@ -345,6 +345,11 @@ inline Score operator*(Score s, int i) {
   return result;
 }
 
+/// Multiplication of a Score by an boolean
+inline Score operator*(Score s, bool b) {
+  return Score(int(s) * int(b));
+}
+
 constexpr Color operator~(Color c) {
   return Color(c ^ BLACK); // Toggle color
 }
@@ -361,6 +366,10 @@ constexpr Piece operator~(Piece pc) {
   return Piece(pc ^ 8); // Swap color of piece B_KNIGHT -> W_KNIGHT
 }
 
+inline File map_to_queenside(File f) {
+  return std::min(f, File(FILE_H - f)); // Map files ABCDEFGH to files ABCDDCBA
+}
+
 constexpr CastlingRights operator&(Color c, CastlingRights cr) {
   return CastlingRights((c == WHITE ? WHITE_CASTLING : BLACK_CASTLING) & cr);
 }