Added facade example source code.

examples/structural/facade.cpp

@@ -0,0 +1,76 @@
+#include <iostream>
+#include <memory>
+
+class Computer
+{
+  public:
+    typedef std::shared_ptr<Computer> ptr_t;
+
+    void makeBootSound(void)
+    {
+      std::cout << "Beep!" << std::endl;
+    }
+
+    void showLoadingScreen(void)
+    {
+      std::cout << "Loading..." << std::endl;
+    }
+
+    void showWelcomeScreen(void)
+    {
+      std::cout << "Ready to use!" << std::endl;
+    }
+
+    void closeEverything(void)
+    {
+      std::cout << "Closing all programs!" << std::endl;
+    }
+    void sleep(void)
+    {
+      std::cout << "Zzz" << std::endl;
+    }
+};
+
+class ComputerFacade
+{
+  public:
+    ComputerFacade(Computer::ptr_t computer)
+        : computer_(computer)
+    {
+    }
+
+    void turnOn(void)
+    {
+      computer_->makeBootSound();
+      computer_->showLoadingScreen();
+      computer_->showWelcomeScreen();
+    }
+
+    void turnOff(void)
+    {
+      computer_->closeEverything();
+      computer_->sleep();
+    }
+
+  private:
+    Computer::ptr_t computer_;
+};
+
+int main()
+{
+  Computer::ptr_t computer = std::make_shared<Computer>();
+  ComputerFacade facade(computer);
+
+  // Output:
+  // Beep!
+  // Loading...
+  // Ready to use!
+  facade.turnOn();
+
+  // Output:
+  // Closing all programs!
+  // Zzz
+  facade.turnOff();
+
+  return 0;
+}