Function hash_combine_impl

cpp/src/arrow/util/hash_util.h:35–37

template <typename SizeT>
inline void hash_combine_impl(SizeT& seed, SizeT value) {
  seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}

inline void hash_combine_impl(uint32_t& h1, uint32_t k1) {
  const uint32_t c1 = 0xcc9e2d51;