Add util::uuid

libs/util/include/psemek/util/uuid.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <psemek/util/hash.hpp>
+
+#include <array>
+#include <cstdint>
+
+namespace psemek::util
+{
+
+	using uuid = std::array<std::uint64_t, 2>;
+
+	static_assert(sizeof(uuid) == 16);
+	static_assert(alignof(uuid) == 8);
+
+}
+
+namespace std
+{
+
+	template <>
+	struct hash<::psemek::util::uuid>
+	{
+		std::size_t operator()(::psemek::util::uuid const & uuid) const noexcept
+		{
+			std::size_t result = uuid[0];
+			::psemek::util::hash_combine(result, uuid[1]);
+			return result;
+		}
+	};
+
+}