1 files changed, 28 insertions, 0 deletions
diff --git a/c,cc/derived.cc b/c,cc/derived.cc
new file mode 100644
index 0000000..809378a
--- /dev/null
+++ b/c,cc/derived.cc
@@ -0,0 +1,28 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+struct Base {
+  virtual int
+  index() { return -1; };
+};
+
+struct D1 : public Base {
+  int idx = 1;
+
+  virtual int
+  index() { return idx; }
+};
+
+int
+main(void)
+{
+  vector<Base*> v;
+  D1* d = new D1;
+  v.push_back(d);
+  cout << v.back()->index() << endl;
+
+  return 0;
+}
+