feat: add event bus to engine public API

include/engine/core/engine.hpp

@@ -13,6 +13,7 @@ class MscEngine : public IMscEngineModuleAPI
 private:
   /// Loaded modules list
   std::vector<std::shared_ptr<MscEngineModule>> _modules;
+  MscEventBus _bus;
 
 public:
   /// Actual version
@@ -20,7 +21,7 @@ public:
 
   MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules);
 
-  UNIMPL getBus() const override;
+  MscEventBus &getBus() override;
   UNIMPL getLoadedModules() const override;
 };
 

include/engine/core/engine_module_api.hpp

@@ -1,6 +1,8 @@
 #ifndef __MSC_ENGINE_MODULE_API_HPP__
 #define __MSC_ENGINE_MODULE_API_HPP__
 
+#include <engine/core/engine_bus.hpp>
+
 typedef void UNIMPL;
 
 class IMscEngineModuleAPI
@@ -9,7 +11,7 @@ public:
   virtual ~IMscEngineModuleAPI() = default;
 
   /// Get access to engine event bus
-  virtual UNIMPL getBus() const = 0;
+  virtual MscEventBus &getBus() = 0;
 
   /// Get access to loaded module list
   virtual UNIMPL getLoadedModules() const = 0;

src/engine/core/engine.cpp

@@ -54,7 +54,10 @@ MscEngine::MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules)
   _modules = std::move(modules);
 }
 
-UNIMPL MscEngine::getBus() const { throw std::runtime_error("Unimplemented"); }
+MscEventBus &MscEngine::getBus()
+{
+  return _bus;
+}
 
 UNIMPL MscEngine::getLoadedModules() const
 {