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use int16_t for histories #1113

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use int16_t for histories #1113

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6 changes: 3 additions & 3 deletions src/movepick.h
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Expand Up @@ -28,7 +28,7 @@
#include "types.h"

/// StatBoards is a generic 2-dimensional array used to store various statistics
template<int Size1, int Size2, typename T = int>
template<int Size1, int Size2, typename T = int16_t>
struct StatBoards : public std::array<std::array<T, Size2>, Size1> {

void fill(const T& v) {
Expand All @@ -52,7 +52,7 @@ struct ButterflyHistory : public ButterflyBoards {
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

Expand All @@ -68,7 +68,7 @@ struct PieceToHistory : public PieceToBoards {
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

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