Improved

Author: sajith

CMakeLists.txt

@@ -26,4 +26,5 @@ add_subdirectory(plant-care-better)
 #add_executable(isp_door_better2 ISP/isp_door_example_better2.cpp)
 #add_executable(isp_device ISP/isp_device_example.cpp)
 #add_executable(isp_device_better ISP/isp_device_example_better.cpp)
-add_executable(isp_multiple_inheritance ISP/isp_multiple_inheritance.cpp)
+#add_executable(isp_multiple_inheritance ISP/isp_multiple_inheritance.cpp)
+add_executable(dip_lamp DIP/dip_lamp_example.cpp)

DIP/dip_lamp_example.cpp

@@ -0,0 +1,51 @@
+//
+// Created by sajith on 4/23/21.
+//
+
+#include <iostream>
+
+class Lamp
+{
+public:
+    void switchOn()
+    {
+        std::cout << "Lamp is on\n";
+    }
+
+    void switchOff()
+    {
+        std::cout << "Lamp is off\n";
+    }
+};
+
+class Button
+{
+    Lamp &lamp;
+    bool on = false;
+
+public:
+    Button(Lamp &lamp) : lamp{lamp} {}
+
+    void toggle()
+    {
+        if (on)
+        {
+            lamp.switchOff();
+        } else
+        {
+            lamp.switchOn();
+        }
+
+        on = !on;
+    }
+};
+
+int main()
+{
+    Lamp lamp;
+    Button button(lamp);
+    button.toggle();
+    button.toggle();
+
+    return 0;
+}