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In this example we have two classes algo1 and algo2 derived by the superclass strategy. Code namespace Strategy{ // Strategy lets the algorithm vary independently // from the clients that use it. choose_strategy(1); } 23. Implementing the Template pattern Solution The template pattern allows the definition of algorithms skeleton as an abstract class, where subclasses have the responsibility of providing its concrete behaviour. The word template is not related to C++ templates. In this example the class algorithm_base has 3 basic steps a(), b(), and c() and it is implemented according to two pure virtual methods X(), and Y() , which are then appropriately implemented by the two derived classes.

Code namespace Factory_Method{ // Define an interface for creating an object, // but let subclasses decide which class to instantiate. // Factory Method lets a class defer instantiation to // subclasses. // // Factory Method can return the same instance multiple // times, or can return a subclass rather than an object // of that exact type. class Base{ public: virtual void what_to_do() = 0; }; class A : public Base{ public: A() { std::cout << "\tClass A" << std::endl; } void what_to_do() { }; }; class B : public Base{ public: B() { std::cout << "\tClass B" << std::endl; } void what_to_do() { }; }; }; // end Factory Method void testFactoryMethod(){ using namespace Creational_Patterns::Factory_Method; Base * b = new A(); b->what_to_do(); delete b; b = new B(); b->what_to_do(); delete b; } 4.

Implementing the Decorator pattern Solution The decorator pattern is used to add additional behaviours to a method that is already existing for an object. In certain situations the existing behaviour is completely overridden. Those additional behaviours can be either permanent, or transient, or dynamically added at run-time. In this example class A_and X inherit from A and implements the virtual method make() accordingly. Code namespace Decorator{ // Attach additional responsibilities to an object // dynamically.

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