1 files changed, 18 insertions, 0 deletions
diff --git a/lang/cpptour/abstract.h b/lang/cpptour/abstract.h
new file mode 100644
index 0000000..71191d9
--- /dev/null
+++ b/lang/cpptour/abstract.h
@@ -0,0 +1,18 @@
+#include "Vector.h"
+
+class Container {
+public:
+  virtual double& operator[] (int) = 0;
+  virtual int size () const = 0;
+  virtual ~Container () {}
+};
+
+class Vector_container : public Container {
+  Vector v;
+public:
+  Vector_container (int);
+  ~Vector_container ();
+
+  double& operator[] (int);
+  int size () const;
+};