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

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By Dr Antonio Gulli

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Implementing the Abstract factory pattern Solution The intuition behind an abstract factory pattern is to encapsulate a group of factories that have a common behaviour with no need of specifying their classes. This pattern allows to exchange concrete implementations with no need of changing the code that uses those implementations. This is because the factory typically returns an abstract pointer and the client does not care about internal details. In this example the class Widget has a pure virtual method.

Operations are performed // without polluting internal object // A practical result of this separation is the ability // to add new operations to existing object structures // without modifying those structures. end(); ++it){ // calling the visitor callback (*it)->accept(*this); }; } }; }; // end visitor void testVisitor() { using namespace Behavioural_Patterns::Visitor; Parent p; parent_element_visitor * pv = new parent_model_one_visitor(); pv->visit(p); delete pv; pv = new parent_model_two_visitor(); pv->visit(p); delete pv; } ABOUT THE AUTHOR An experienced data mining engineer, passionate about technology and innovation in consumers’ space.

Implementing the Builder pattern Solution The builder aims at separating the construction of complex objects from their representation. Instead of using different constructors, the pattern defines a single object: the builder. This object builds the desired object step-by-step according to the configuration parameters defined by the user. The Builder is different from the Abstract factory because the former delegates the construction of the actual object to a specific auxiliary class/object, while the latter uses inheritance for exchanging concrete implementations.

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