+Q_DECLARE_METATYPE(UserId)
+Q_DECLARE_METATYPE(MsgId)
+Q_DECLARE_METATYPE(BufferId)
+Q_DECLARE_METATYPE(NetworkId)
+Q_DECLARE_METATYPE(IdentityId)
+Q_DECLARE_METATYPE(AccountId)
+
+Q_DECLARE_METATYPE(QHostAddress)
+
+// a few typedefs
+typedef QList<MsgId> MsgIdList;
+typedef QList<BufferId> BufferIdList;
+
+/**
+ * Catch-all stream serialization operator for enum types.
+ *
+ * @param[in,out] out Stream to serialize to
+ * @param[in] value Value to serialize
+ * @returns A reference to the stream
+ */
+template<typename T,
+ typename = typename std::enable_if<std::is_enum<T>::value>::type>
+QDataStream &operator<<(QDataStream &out, T value) {
+ out << static_cast<typename std::underlying_type<T>::type>(value);
+ return out;
+}
+
+/**
+ * Catch-all stream serialization operator for enum types.
+ *
+ * @param[in,out] in Stream to deserialize from
+ * @param[out] value Value to deserialize into
+ * @returns A reference to the stream
+ */
+template<typename T,
+ typename = typename std::enable_if<std::is_enum<T>::value>::type>
+QDataStream &operator>>(QDataStream &in, T &value) {
+ typename std::underlying_type<T>::type v;
+ in >> v;
+ value = static_cast<T>(v);
+ return in;
+}