add Object Adapter

adapter/ObjectAdapter.cpp

@@ -0,0 +1,69 @@
+/*
+ * C++ Design Patterns: Adapter (Object scope)
+ * Author: Jakub Vojvoda [github.com/JakubVojvoda]
+ * 2016
+ *
+ * Source code is licensed under MIT licence
+ * (for more details see LICENCE)
+ *
+ */
+
+#include <iostream>
+
+/*
+ * Target
+ * defines specific interface that Client uses
+ */
+class Target {
+public:
+  virtual void request() = 0;
+  // ...
+};
+
+/*
+ * Adaptee
+ * defines an existing interface that needs adapting and thanks
+ * to Adapter it will get calls that client makes on the Target
+ *
+ */
+class Adaptee {
+public:
+  void specificRequest() {
+    std::cout << "specific request" << std::endl;
+    // ...
+  }
+  // ...
+};
+
+/*
+ * Adapter
+ * implements the Target interface and when it gets a method call it
+ * delegates the call to a Adaptee
+ */
+class Adapter : public Target {
+public:
+  Adapter() : adaptee() {}
+
+  ~Adapter() {
+    delete adaptee;
+  }
+
+  void request() {
+    adaptee->specificRequest();
+    // ...
+  }
+  // ...
+
+private:
+  Adaptee *adaptee;
+  // ...
+};
+
+
+int main()
+{
+  Target *t = new Adapter();
+  t->request();
+
+  return 0;
+}

adapter/README.md

@@ -1,8 +1,9 @@
 ## Adapter
 
-Convert the interface of a class into another interface clients expect.
+Convert the interface of a class into another interface the clients expect.
 Adapter lets classes work together that couldn't otherwise because of
-incompatible interfaces. 
+incompatible interfaces, ie. allows to use a client with an incompatible 
+interface by an Adapter that does the conversion. 
 
 ### When to use