add iterable

raw_ptr.cc

@@ -0,0 +1,38 @@
+#include <iostream>
+#include "main.h"
+
+template<typename T>
+class Wrapper {
+	T* impl;
+
+public:
+	Wrapper(T* obj) : impl(obj) {}
+
+	T* operator->() { return impl; }
+	const T* operator->() const { return impl; }
+
+	operator T*() { return impl; }
+	operator const T*() const { return impl; }
+
+	operator T&() { return *impl; }
+	operator const T&() const { return *impl; }
+};
+
+void render_shape_by_ptr(IShape* shape) {
+	shape->draw();
+}
+
+void render_shape_by_ref(IShape& shape) {
+	shape.draw();
+}
+
+int main() {
+	Circle circle {10};
+	Wrapper<IShape> wrapped(&circle);
+
+	std::cout << wrapped->area() << "\n";
+
+	render_shape_by_ptr(wrapped);
+
+	render_shape_by_ref(wrapped);
+}