April 20, 2017

Download A Collection of Design Pattern Interview Questions Solved in by Dr Antonio Gulli PDF

By Dr Antonio Gulli

A set of layout styles applied in C++

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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.

This is generally used for supporting undo operations, for supporting serialization, or for storing the seed of a pseudorandom number generator. In this example a class memento is used to store a value which is saved and successively restored by the class client. More sophisticate implementations can use a vector to store multiple values and support ‘undo’ operations. Code namespace Memento{ // The client requests a Memento from the source object // when it needs to checkpoint the source object's state // If the client subsequently needs to "rollback" the // source object's state, it hands the Memento back to // the source object for reinstatement.

Implementing the Observer pattern Solution The Observer pattern implements the publisher/subscriber interactions, where a number of registered observer objects are informed about events produced by the publishers. This pattern is frequently used for implementing a distributed event handling system and for windows systems. In this example the class Observer is implemented according to a pure virtual method update which is itself implemented by subclasses a_observer and b_observer. The class subject keeps a vector of observers which are notified by calling the method notify().

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