Forgot file, it will go away soon though.

badref.cpp

@@ -0,0 +1,48 @@
+#include <string>
+#include <memory>
+#include <iostream>
+
+using std::string, std::unique_ptr,
+      std::shared_ptr, std::make_unique;
+
+class BadRef {
+  string &name;
+
+public:
+  BadRef(string &name) : name(name) {}
+
+  void set_name(string &n) {
+    name = n;
+  }
+};
+
+class GoodRef {
+  string *name;
+
+public:
+  /*
+   * After calling, name is owned.
+   */
+  GoodRef(string *n) : name(n) {}
+
+  void print() {
+    std::cout << "My name is " << *name << std::endl;
+  }
+};
+
+int main() {
+  string my_name = "Zed";
+  string your_name = "Alex";
+  string &ref_test = my_name;
+  string *ptr_name = new string("Pointer");
+
+  ref_test = your_name;
+
+  auto br = BadRef(my_name);
+  br.set_name(your_name);
+
+  auto gr = GoodRef(ptr_name);
+  gr.print();
+
+  return 0;
+}