From: Marco Costalba <mcostalba@gmail.com>
Date: Sun, 9 Jun 2013 10:43:12 +0000 (+0200)
Subject: Introduce operator~(Piece c)
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=db4cd89cb889446fb349d0d93640b640b1b9a8a1

Introduce operator~(Piece c)

Small syntactic sugar to reverse piece color.

No functional change.
---

diff --git a/src/position.cpp b/src/position.cpp
index d145ddfa..2227c553 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -85,17 +85,17 @@ void init() {
   side = rk.rand<Key>();
   exclusion  = rk.rand<Key>();
 
-  for (PieceType pt = PAWN; pt <= KING; pt++)
+  for (Piece pc = W_PAWN; pc <= W_KING; pc++)
   {
-      PieceValue[MG][make_piece(BLACK, pt)] = PieceValue[MG][pt];
-      PieceValue[EG][make_piece(BLACK, pt)] = PieceValue[EG][pt];
+      PieceValue[MG][~pc] = PieceValue[MG][pc];
+      PieceValue[EG][~pc] = PieceValue[EG][pc];
 
-      Score v = make_score(PieceValue[MG][pt], PieceValue[EG][pt]);
+      Score v = make_score(PieceValue[MG][pc], PieceValue[EG][pc]);
 
       for (Square s = SQ_A1; s <= SQ_H8; s++)
       {
-          pieceSquareTable[make_piece(WHITE, pt)][ s] =  (v + PSQT[pt][s]);
-          pieceSquareTable[make_piece(BLACK, pt)][~s] = -(v + PSQT[pt][s]);
+          pieceSquareTable[ pc][ s] =  (v + PSQT[pc][s]);
+          pieceSquareTable[~pc][~s] = -(v + PSQT[pc][s]);
       }
   }
 }
diff --git a/src/psqtab.h b/src/psqtab.h
index ca39fe88..3a6b1015 100644
--- a/src/psqtab.h
+++ b/src/psqtab.h
@@ -25,7 +25,7 @@
 #define S(mg, eg) make_score(mg, eg)
 
 
-/// PSQT[PieceType][Square] contains Piece-Square scores. For each piece type on
+/// PSQT[Piece][Square] contains Piece-Square scores. For each piece type on
 /// a given square a (midgame, endgame) score pair is assigned. PSQT is defined
 /// for white side, for black side the tables are symmetric.
 
diff --git a/src/types.h b/src/types.h
index 653ebade..ac2ca0e7 100644
--- a/src/types.h
+++ b/src/types.h
@@ -359,6 +359,10 @@ inline Square operator~(Square s) {
   return Square(s ^ 56); // Vertical flip SQ_A1 -> SQ_A8
 }
 
+inline Piece operator~(Piece c) {
+  return Piece(c ^ 8);
+}
+
 inline Square operator|(File f, Rank r) {
   return Square((r << 3) | f);
 }