Update encapsulation for accessing private stuff from EventBus

lib/CMakeLists.txt

@@ -39,6 +39,7 @@ add_library(EventBus
 	src/dexode/eventbus/internal/AsyncCallbackVector.h
 	src/dexode/eventbus/internal/CallbackVector.h
 	src/dexode/eventbus/internal/common.h
+	src/dexode/eventbus/internal/ListenerAttorney.hpp
 	src/dexode/eventbus/internal/TransactionCallbackVector.h
 	src/dexode/eventbus/Listener.hpp
 	src/dexode/eventbus/strategy/Protected.cpp src/dexode/eventbus/strategy/Protected.hpp

lib/src/dexode/EventBus.hpp

@@ -14,7 +14,8 @@ namespace dexode
 template <class Strategy>
 class EventBus
 {
-	friend class eventbus::Listener<EventBus<Strategy>>;
+	template <typename>
+	friend class dexode::eventbus::internal::ListenerAttorney;
 
 public:
 	using Listener = eventbus::Listener<EventBus<Strategy>>;

lib/src/dexode/eventbus/Listener.hpp

@@ -4,6 +4,8 @@
 #include <functional>
 #include <memory>
 
+#include "dexode/eventbus/internal/ListenerAttorney.hpp"
+
 namespace dexode::eventbus
 {
 
@@ -14,7 +16,7 @@ public:
 	explicit Listener() = default; // Dummy listener
 
 	explicit Listener(std::shared_ptr<Bus> bus)
-		: _id{bus->newListenerID()}
+		: _id{internal::ListenerAttorney<Bus>::newListenerID(*bus)}
 		, _bus{std::move(bus)}
 	{}
 
@@ -65,8 +67,9 @@ public:
 		{
 			throw std::runtime_error{"bus is null"};
 		}
-		_bus->template listen<Event>(_id,
-									 std::forward<std::function<void(const Event&)>>(callback));
+
+		internal::ListenerAttorney<Bus>::template listen<Event>(
+			*_bus, _id, std::forward<std::function<void(const Event&)>>(callback));
 	}
 
 	void unlistenAll()
@@ -75,7 +78,7 @@ public:
 		{
 			throw std::runtime_error{"bus is null"};
 		}
-		_bus->unlistenAll(_id);
+		internal::ListenerAttorney<Bus>::unlistenAll(*_bus, _id);
 	}
 
 	template <typename Event>
@@ -85,7 +88,7 @@ public:
 		{
 			throw std::runtime_error{"bus is null"};
 		}
-		_bus->template unlisten<Event>(_id);
+		internal::ListenerAttorney<Bus>::template unlisten<Event>(*_bus, _id);
 	}
 
 private:

lib/src/dexode/eventbus/internal/ListenerAttorney.hpp

@@ -0,0 +1,50 @@
+//
+// Created by gelldur on 30.10.2019.
+//
+#pragma once
+
+//#include "dexode/EventBus.hpp"
+
+namespace dexode::eventbus
+{
+template <typename>
+class Listener;
+} // namespace dexode::eventbus
+
+namespace dexode::eventbus::internal
+{
+
+template <typename EventBus_t>
+class ListenerAttorney
+{
+	template <typename>
+	friend class dexode::eventbus::Listener;
+
+private:
+	static constexpr std::uint32_t newListenerID(EventBus_t& bus)
+	{
+		return bus.newListenerID();
+	}
+
+	template <class Event>
+	static constexpr void listen(EventBus_t& bus,
+								 const std::uint32_t listenerID,
+								 std::function<void(const Event&)>&& callback)
+	{
+		bus.template listen<Event>(listenerID,
+								   std::forward<std::function<void(const Event&)>>(callback));
+	}
+
+	static constexpr void unlistenAll(EventBus_t& bus, const std::uint32_t listenerID)
+	{
+		bus.unlistenAll(listenerID);
+	}
+
+	template <typename Event>
+	static constexpr void unlisten(EventBus_t& bus, const std::uint32_t listenerID)
+	{
+		bus.template unlisten<Event>(listenerID);
+	}
+};
+
+} // namespace dexode::eventbus::internal