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Dr Antonio Gulli's A Collection of Design Pattern Interview Questions Solved in PDF

By Dr Antonio Gulli

ISBN-10: 1497484596

ISBN-13: 9781497484597

A set of layout styles carried out in C++

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It_end; ++it){ delete *it; } } private: static std::vectoricons_; }; std::vector FlyweightFactory::icons_; // force allocation }; // end Flyweight void testFlyweight(){ using namespace Structural_Patterns::Flyweight; FlyweightFactory * fw = new FlyweightFactory(); fw->getIcon(0); fw->getIcon(0); delete fw; } 13. Implementing the Proxy pattern Solution The proxy pattern is used for mediating the access to an object in those situations where a need of additional functionalities is present.

Implementing the State pattern Solution The State pattern is used to allow an object to change his behaviour, when the internal state of the object itself is changing. For instance this pattern can be used to change the state of an object at run-time. ) which are at their turn implemented in the class OFF() and ON() respectively. The current state is maintained within the class tool as a pointer. Code namespace State { // Allow an object to alter its behavior when its // internal state changes.

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. create_memento(); std::cout << m->getValue(); delete m; } 20. 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.

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A Collection of Design Pattern Interview Questions Solved in C++ by Dr Antonio Gulli

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