code refactoring: fix memory leaks, code style, etc.

template-method/TemplateMethod.cpp

@@ -14,16 +14,20 @@
  * AbstractClass
  * implements a template method defining the skeleton of an algorithm
  */
-class AbstractClass {
+class AbstractClass
+{
 public:
-  void templateMethod() {
+  virtual ~AbstractClass() {}
+  
+  void templateMethod()
+  {
     // ...
     primitiveOperation1();
     // ...
     primitiveOperation2();
     // ...
   }
-
+  
   virtual void primitiveOperation1() = 0;
   virtual void primitiveOperation2() = 0;
   // ...
@@ -35,14 +39,19 @@ public:
  * of the algorithm, there may be many Concrete classes, each implementing
  * the full set of the required operation
  */
-class ConcreteClass : public AbstractClass {
+class ConcreteClass : public AbstractClass
+{
 public:
-  void primitiveOperation1() {
+  ~ConcreteClass() {}
+  
+  void primitiveOperation1()
+  {
     std::cout << "Primitive operation 1" << std::endl;
     // ...
   }
-
-  void primitiveOperation2() {
+  
+  void primitiveOperation2()
+  {
     std::cout << "Primitive operation 2" << std::endl;
     // ...
   }
@@ -54,6 +63,7 @@ int main()
 {
   AbstractClass *tm = new ConcreteClass;
   tm->templateMethod();
-
+  
+  delete tm;
   return 0;
 }