X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftypes.h;fp=src%2Ftypes.h;h=c1598561812d949d775bd801d26cc803b61538c8;hp=0c512f5bf3f7544afcae25a0cb451fb31d952ece;hb=de24fcebc873ce2d65b30e039745dbc2e851f443;hpb=ca41ee6632368676a2fb98fd2970ac9b183f0aa9

diff --git a/src/types.h b/src/types.h
index 0c512f5b..c1598561 100644
--- a/src/types.h
+++ b/src/types.h
@@ -455,6 +455,11 @@ constexpr bool is_ok(Move m) {
   return from_sq(m) != to_sq(m); // Catch MOVE_NULL and MOVE_NONE
 }
 
+/// Based on a congruential pseudo random number generator
+constexpr Key make_key(uint64_t seed) {
+  return seed * 6364136223846793005ULL + 1442695040888963407ULL;
+}
+
 #endif // #ifndef TYPES_H_INCLUDED
 
 #include "tune.h" // Global visibility to tuning setup