+// ---- Template function implementations ---------------------------------------
+
+template<typename Signal>
+bool SignalProxy::attachSignal(const typename FunctionTraits<Signal>::ClassType* sender, Signal signal, const QByteArray& signalName)
+{
+ static_assert(std::is_member_function_pointer<Signal>::value, "Signal must be given as member function pointer");
+
+ // Determine the signalName to be stored in the RpcCall
+ QByteArray name;
+ if (signalName.isEmpty()) {
+ auto method = QMetaMethod::fromSignal(signal);
+ if (!method.isValid()) {
+ qWarning().nospace() << Q_FUNC_INFO << ": Function pointer is not a signal";
+ return false;
+ }
+ name = "2" + method.methodSignature(); // SIGNAL() prefixes the signature with "2"
+ }
+ else {
+ name = QMetaObject::normalizedSignature(signalName.constData());
+ }
+
+ // Upon signal emission, marshall the signal's arguments into a QVariantList and dispatch an RpcCall message
+ connect(sender, signal, this, [this, signalName = std::move(name)](auto&&... args) {
+ this->dispatchSignal(std::move(signalName), {QVariant::fromValue(args)...});
+ });
+
+ return true;
+}
+
+template<typename Slot, typename>
+bool SignalProxy::attachSlot(const QByteArray& signalName, typename FunctionTraits<Slot>::ClassType* receiver, Slot slot)
+{
+ // Create a wrapper function that invokes the member function pointer for the receiver instance
+ attachSlotObject(signalName, std::make_unique<SlotObject<Slot>>(receiver, [receiver, slot = std::move(slot)](auto&&... args) {
+ (receiver->*slot)(std::forward<decltype(args)>(args)...);
+ }));
+ return true;
+}
+
+template<typename Slot, typename>
+bool SignalProxy::attachSlot(const QByteArray& signalName, const QObject* context, Slot slot)
+{
+ static_assert(!std::is_same<Slot, const char*>::value, "Old-style slots not supported");
+
+ attachSlotObject(signalName, std::make_unique<SlotObject<Slot>>(context, std::move(slot)));
+ return true;
+}
+
+/**
+ * Base object for storing a slot (or functor) to be invoked with a list of arguments.
+ *
+ * @note Having this untemplated base class for SlotObject allows for handling slots in the implementation rather than in the header.
+ */
+class COMMON_EXPORT SignalProxy::SlotObjectBase
+{
+public:
+ virtual ~SlotObjectBase() = default;
+
+ /**
+ * @returns The context associated with the slot
+ */
+ const QObject* context() const;
+
+ /**
+ * Invokes the slot with the given list of parameters.
+ *
+ * If the parameters cannot all be converted to the slot's argument types, or there is a mismatch in argument count,
+ * the invocation will fail.
+ *
+ * @param params List of arguments marshalled as QVariants
+ * @returns true if the invocation was successful
+ */
+ virtual bool invoke(const QVariantList& params) const = 0;
+
+protected:
+ SlotObjectBase(const QObject* context);
+
+private:
+ const QObject* _context;
+};
+
+/**
+ * Specialization of SlotObjectBase for a particular type of slot.
+ *
+ * Callable may be a function wrapper around a member function pointer of type Slot,
+ * or a functor that can be invoked directly.
+ *
+ * @tparam Slot Type of the slot, used for determining the callable's signature
+ * @tparam Callable Type of the actual callable to be invoked
+ */
+template<typename Slot, typename Callable>
+class SignalProxy::SlotObject : public SlotObjectBase
+{
+public:
+ /**
+ * Constructs a SlotObject for the given callable, whose lifetime is controlled by context.
+ *
+ * @param context Context object; if destroyed, the slot object will be destroyed as well by SignalProxy.
+ * @param callable Callable to be invoked
+ */
+ SlotObject(const QObject* context, Callable callable)
+ : SlotObjectBase(context)
+ , _callable(std::move(callable))
+ {}
+
+ // See base class
+ bool invoke(const QVariantList& params) const override
+ {
+ if (QThread::currentThread() != context()->thread()) {
+ qWarning() << "Cannot call slot in different thread!";
+ return false;
+ }
+ return invokeWithArgsList(_callable, params) ? true : false;
+ }
+
+private:
+ Callable _callable;
+};