add Proxy pattern

proxy/Proxy.cpp

@@ -0,0 +1,68 @@
+/*
+ * C++ Design Patterns: Proxy
+ * Author: Jakub Vojvoda [github.com/JakubVojvoda]
+ * 2016
+ *
+ * Source code is licensed under MIT licence
+ * (for more details see LICENCE)
+ *
+ */
+
+#include <iostream>
+
+/*
+ * Subject
+ * defines the common interface for RealSubject and Proxy
+ * so that a Proxy can be used anywhere a RealSubject is expected
+ */
+class Subject {
+public:
+  virtual ~Subject() { /* ... */ }
+
+  virtual void request() = 0;
+  // ...
+};
+
+/*
+ * Real Subject
+ * defines the real object that the proxy represents
+ */
+class RealSubject : public Subject {
+public:
+  void request() {
+    std::cout << "Real Subject request" << std::endl;
+  }
+  // ...
+};
+
+/*
+ * Proxy
+ * maintains a reference that lets the proxy access the real subject
+ */
+class Proxy : public Subject {
+public:
+  Proxy() {
+    subject = new RealSubject();
+  }
+
+  ~Proxy() {
+    delete subject;
+  }
+
+  void request() {
+    subject->request();
+  }
+  // ...
+
+private:
+  RealSubject *subject;
+};
+
+
+int main()
+{
+  Proxy *proxy = new Proxy;
+  proxy->request();
+
+  return 0;
+}

proxy/README.md

@@ -1,6 +1,7 @@
 ## Proxy
 
-Provide a surrogate or placeholder for another object to control access to it. 
+Proxy pattern provides a surrogate or placeholder for another object to control access to it.
+The pattern has structural purpose and applies to objects. 
 
 ### When to use