diff --git a/CMakeLists.txt b/CMakeLists.txt
index baf500a..6abcb81 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ project(cigus
     LANGUAGES CXX)
 
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
diff --git a/cigus.hpp b/cigus.hpp
index dfb8d7d..8e2b806 100644
--- a/cigus.hpp
+++ b/cigus.hpp
@@ -8,33 +8,103 @@
 namespace cigus {
 	using json = nlohmann::json;
 
+	template<typename T> class Ref;
+	template<typename T> class OriginRef;
+	template<typename T> class MutRef;
+	template<typename T> class ConstRef;
+
 	template<typename T>
 	class Ref {
-		T *ptr;
+	protected:
+		T *ptr = nullptr;
 
 	public:
-		explicit Ref(T *ptr) : ptr(ptr) {
-			if (ptr == nullptr) {
-				spdlog::error("Ref<T> cannot be null");
-				throw std::runtime_error("Ref<T> cannot be null");
+		virtual ~Ref() {}
+		Ref() = delete;
+		Ref(const Ref &other) = delete;
+		Ref(Ref &&other) = delete;
+
+		Ref(const OriginRef<T>& ptr) : ptr(ptr.ptr) {
+		}
+
+		Ref(T* ptr) : ptr(ptr)
+		{
+
+		}
+
+		virtual bool operator!() const {
+			return ptr == nullptr;
+		}
+
+		virtual void check() const {
+			assert(ptr != nullptr || "Dereferencing null pointer");
+		}
+
+		virtual const T &operator*() const {
+			check();
+			return *ptr;
+		}
+
+		virtual const T *operator->() const {
+			check();
+			return ptr;
+		}
+
+		static Ref Null()
+		{
+			return Ref(nullptr);
+		}
+	};
+
+	template<typename T>
+	class OriginRef final : public MutRef<T> {
+	public:
+		friend class Ref<T>;
+
+		template<typename G, typename... Args>
+		OriginRef(Args... args) : Ref<T>(new G(std::forward<Args>(args)...)) {
+		}
+
+		OriginRef(T* ptr) : MutRef<T>(ptr) {
+		}
+
+		~OriginRef() override {
+			if (this->ptr != nullptr) {
+				delete this->ptr;
 			}
 		}
 
-		Ref(const Ref &other) : ptr(other.ptr) {
-			if (other.ptr == nullptr) {
-				spdlog::error("Ref<T> cannot be null");
-				throw std::runtime_error("Ref<T> cannot be null");
-			}
+		[[nodiscard]] MutRef<T> mut() {
+			return MutRef<T>(this->ptr);
 		}
 
-		Ref(Ref &&other) noexcept : ptr(other.ptr) {
-			if (other.ptr == nullptr) {
-				spdlog::error("Ref<T> cannot be null");
-				throw std::runtime_error("Ref<T> cannot be null");
-			}
+		[[nodiscard]] ConstRef<T> immute() const {
+			return ConstRef<T>(this->ptr);
+		}
+	};
+
+	template<typename T>
+	class MutRef : public Ref<T> {
+	protected:
+		using Ref<T>::ptr;
+	public:
+		friend class Ref<T>;
+
+		using Ref<T>::check;
+		using Ref<T>::operator*;
+		using Ref<T>::operator->;
+
+		MutRef(const OriginRef<T>& other) : Ref<T>(other.ptr) {}
+
+		MutRef(T* ptr) : Ref<T>(ptr) {}
+
+		MutRef(const MutRef &other) : Ref<T>(other.ptr) {
 		}
 
-		Ref &operator=(Ref &&other) noexcept {
+		MutRef(MutRef &&other) noexcept : Ref<T>(other.ptr) {
+		}
+
+		MutRef &operator=(MutRef &&other) noexcept {
 			if (this->ptr != other.ptr) {
 				ptr = other.ptr;
 			}
@@ -42,52 +112,82 @@ namespace cigus {
 		}
 
 		T &operator*() {
-			return *ptr;
-		}
-
-		const T &operator*() const {
+			check();
 			return *ptr;
 		}
 
 		T *operator->() {
+			check();
 			return ptr;
 		}
+	};
 
-		const T *operator->() const {
-			return ptr;
+	template<typename T>
+	class ConstRef : public Ref<T>
+	{
+	protected:
+		using Ref<T>::ptr;
+		using Ref<T>::check;
+	public:
+		friend class Ref<T>;
+
+		ConstRef(const OriginRef<T> other) : Ref<T>(other.ptr) {
 		}
 
-		void free() {
-			delete ptr;
-			ptr = nullptr;
+		ConstRef(const MutRef<T> other) : Ref<T>(other.ptr) {
+		}
+	};
+
+	template<typename T>
+	class NullRef
+	{
+	public:
+		friend class Ref<T>;
+
+		NullRef(const NullRef &other) = delete;
+		NullRef(NullRef &&other) = delete;
+
+		NullRef &operator=(NullRef &&other) = delete;
+
+		NullRef() : Ref<T>(nullptr) {
+		}
+
+		T *ptr = nullptr;
+
+		bool operator!() const {
+			return false;
 		}
 	};
 }
 
 namespace cigus::UI {
 	class RenderCall {
-		sf::Drawable *drawable;
+		OriginRef<sf::Drawable> drawable;
 		sf::RenderStates states;
 
 	public:
-		RenderCall(sf::Drawable *drawable, sf::RenderStates states) : drawable(drawable), states(states) {
-		}
-
-		~RenderCall() {
-			delete drawable;
+		explicit RenderCall(const sf::RenderStates& states, sf::Drawable *ptr) : drawable(ptr), states(states) {
+			drawable.check();
 		}
 
 		void draw(sf::RenderTarget &target, const sf::RenderStates &states) const {
 			target.draw(*drawable, states);
 		}
+
+		MutRef<sf::Drawable> operator->() {
+			drawable.check();
+			return drawable.mut();
+		}
 	};
 
 	class View {
 		std::vector<RenderCall> m_RenderCalls;
 
 	protected:
-		void Rectangle() {
-			m_RenderCalls.emplace_back(new sf::RectangleShape(sf::Vector2f(100, 100)), sf::RenderStates());
+		void Rectangle(const float x, const float y, sf::Color color = sf::Color::White) {
+			auto shape = new sf::RectangleShape(sf::Vector2f(x, y));
+			shape->setFillColor(color);
+			m_RenderCalls.emplace_back(sf::RenderStates(), shape);
 		}
 
 	public:
@@ -97,21 +197,30 @@ namespace cigus::UI {
 			return m_RenderCalls;
 		}
 
+		virtual bool update()
+		{
+			return false;
+		}
+
+		void draw() {
+			if (!m_RenderCalls.empty())
+			{
+				m_RenderCalls.clear();
+			}
+			body();
+		}
 		virtual void body() = 0;
 	};
 
 	class Renderer {
 	public:
-		explicit Renderer(const Ref<View> &_view) : view(_view) { view->body(); }
+		explicit Renderer(const MutRef<View> &_view) : view(_view) { view->body(); }
 
-		void destroy() {
-			view.free();
-		}
-
-		Ref<View> view;
+		MutRef<View> view;
 
 		void update() {
-			view->body();
+			if (view->update())
+				view->draw();
 		}
 
 		void render(sf::RenderTarget &target, const sf::RenderStates &states) const {
diff --git a/src/main.cpp b/src/main.cpp
index a8b4d0a..8699510 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,9 +8,16 @@
 
 class NewView : public cigus::UI::View {
 public:
+	bool update() override
+	{
+		std::cout << "Update...\n";
+		return true;
+	}
+
 	void body() override {
-		std::cout << "Hello World!" << std::endl;
-		Rectangle();
+		std::cout << "Body\n";
+		//Rectangle(100, 100, sf::Color(250,250,250));
+		Rectangle(10,20, sf::Color(120,120,120));
 	}
 };
 
@@ -20,7 +27,8 @@ int main(int argc, char** argv) {
 	sf::RenderWindow window(sf::VideoMode({800, 600}), "Hello World!");
 	window.setFramerateLimit(60);
 
-	UI::Renderer renderer(cigus::Ref<UI::View>(new NewView()));
+	cigus::OriginRef<UI::View> view = cigus::OriginRef<UI::View>(new NewView);
+	UI::Renderer renderer(view);
 
 	while (window.isOpen()) {
 
@@ -32,12 +40,12 @@ int main(int argc, char** argv) {
 			}
 		}
 
+		renderer.update();
 
 		window.clear();
 		renderer.render(window, sf::RenderStates());
 		window.display();
 	}
-	renderer.destroy();
 
 	return 0;
 }
\ No newline at end of file