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book/06-классы-объектно-ориентированный-стиль/src/chapter-6-13-1/app.d

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+import std.stdio : writeln;
+
+class Shape
+{
+    protected string _name;
+    abstract void print();
+}
+
+class DBObject
+{
+    protected string _name;
+    abstract void print();
+    void saveState()
+    {
+        writeln(_name);
+    }
+}
+
+class StorableShape : Shape
+{
+    private class MyDBObject : DBObject
+    {
+        this(string name)
+        {
+            _name = name;
+        }
+
+        override void print()
+        {
+            writeln(_name);
+        }
+
+        final override void saveState()
+        {
+            writeln(this.outer._name, "; ", _name);
+        }
+    }
+
+    private MyDBObject _store;
+    alias _store this;
+
+    this(string outName, string inName)
+    {
+        _name = outName;
+        _store = new MyDBObject(inName);
+    }
+    
+    override void print()
+    {
+        writeln(_name);
+    }
+}
+
+void main()
+{
+    auto s = new StorableShape("first", "second");
+    s.print();          // StorableShape._name
+    s._store.print();   // StorableShape.MyDBObject._name
+    s.saveState();      // StorableShape._name and StorableShape.MyDBObject._name
+}