A small tweak to lua random

luprex/core/cpp/util.hpp

@@ -70,6 +70,9 @@ eng::string hash_to_hex(const HashValue &hash);
 // This is a good hash, but not cryptographically good.
 uint64_t hash_ints(uint64_t n1, uint64_t n2, uint64_t n3, uint64_t n4);
 
+// Convert a 64-bit hash value into a floating point number between 0 and 1.
+double hash_to_double(uint64_t hash);
+
 // Split a string into multiple strings
 StringVec split(const eng::string &s, char sep);