Implement singleton class into application

game/src/game.cpp

@@ -4,11 +4,11 @@
 class Game : public Inferno::Application
 {
 public:
-	Game() {};
+	Game() : Application({}) {}
-	~Game() {};
+	~Game() {}
 };
 
-Inferno::Application* Inferno::createApplication()
+Inferno::Application& Inferno::getApplication()
 {
-	return new Game();
+	return Game::the();
 }

inferno/src/inferno/application.cpp

@@ -21,13 +21,8 @@
 
 namespace Inferno {
 
-	Application* Application::s_instance = nullptr;
+	Application::Application(s)
-
-	Application::Application()
 	{
-		ASSERT(!s_instance, "Application already exists!");
-		s_instance = this;
-
 		// Initialize
 
 		Settings::initialize();

inferno/src/inferno/application.h

@@ -3,6 +3,8 @@
 
 #include <memory> // std::unique_ptr, std::shared_ptr
 
+#include "inferno/singleton.h"
+
 namespace Inferno {
 
 	class Event;
@@ -14,12 +16,9 @@ namespace Inferno {
 	class WindowCloseEvent;
 	class WindowResizeEvent;
 
-	class VertexArray;
+	class Application : public Singleton<Application> {
-	class Shader;
-
-	class Application {
 	public:
-		Application();
+		Application(s);
 		virtual ~Application();
 
 		int run();
@@ -30,31 +29,24 @@ namespace Inferno {
 		bool onKeyPress(KeyPressEvent& e);
 		bool onMousePosition(MousePositionEvent& e);
 
-// -----------------------------------------
-
 		inline void setStatus(int status) { m_status = status; }
 
 		inline Window& getWindow() const { return *m_window; }
 
-		static inline Application& the() { return *s_instance; }
-
 	private:
-		std::unique_ptr<Window> m_window;
+		int m_status = 0;
-		std::shared_ptr<Scene> m_scene;
+		float m_lastFrameTime { 0.0f };
 
-		float m_lastFrameTime = 0.0f;
+		std::unique_ptr<Window> m_window { nullptr };
+		std::shared_ptr<Scene> m_scene { nullptr };
 
 		//
-		std::shared_ptr<Font> m_font;
+		std::shared_ptr<Font> m_font { nullptr };
 		//
-
-		int m_status = 0;
-
-		static Application* s_instance;
 	};
 
 	// To be defined in the game
-	extern Application* createApplication();
+	extern Application& getApplication();
 
 }
 

inferno/src/inferno/entrypoint.h

@@ -15,13 +15,7 @@ int main(int argc, char* argv[])
 	(void)argc;
 	(void)argv;
 
-	auto app = Inferno::createApplication();
+	return Inferno::getApplication().run();
-
-	int status = app->run();
-
-	delete app;
-
-	return status;
 }
 
 #endif // ENTRYPOINT_H