use auto& for histories

No functional change.

Closes #1113

diff --git a/src/movepick.h b/src/movepick.h
index 34cac635cfb01d83d763e8bc55850b1eee15c91e..a7cac4ba85ba64c03ceb29f64a0aa2eca7d5a939 100644 (file)
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -52,7 +52,7 @@ struct ButterflyHistory : public ButterflyBoards {
   void update(Color c, Move m, int v) {
 
     const int D = 324;
   void update(Color c, Move m, int v) {
 
     const int D = 324;

-    int& entry = (*this)[c][from_to(m)];
+    auto& entry = (*this)[c][from_to(m)];

 
     assert(abs(v) <= D); // Consistency check for below formula
 
 
     assert(abs(v) <= D); // Consistency check for below formula
 


@@ -68,7 +68,7 @@ struct PieceToHistory : public PieceToBoards {
   void update(Piece pc, Square to, int v) {
 
     const int D = 936;
   void update(Piece pc, Square to, int v) {
 
     const int D = 936;

-    int& entry = (*this)[pc][to];
+    auto& entry = (*this)[pc][to];

 
     assert(abs(v) <= D); // Consistency check for below formula
 
 
     assert(abs(v) <= D); // Consistency check for below formula