Compile-time hash of a litteral string (requires C++11)

Compile-time litteral hash

constexpr unsigned int const_hash(const char* str)
{
	return *str ? static_cast<unsigned int>(*str) + 33 * const_hash(str+1) : 5381;
}

constexpr unsigned int operator "" _hash(const char* str, size_t) 
{
	return const_hash(str);
}

int main()
{
  unsigned int hash_value = "hash me"_hash;
  return 0;
}