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By Dr Antonio Gulli

ISBN-10: 1497484596

ISBN-13: 9781497484597

A set of layout styles carried out in C++

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Extra info for A Collection of Design Pattern Interview Questions Solved in C++

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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. Those include, but are not limited to, control of access, reduction of complexity for operation, network access, access to a file system or to a large chunk on memory and more in general access to resources. In this example an ImageProxy class is used to access an image which could be for instance located in a remote file system.

This is different from // Adapter which makes unrelated classes work together. class BridgeImp{ // de-couple public: BridgeImp() {}; protected: int my_data_; }; class Bridge{ public: Bridge() {}; protected: BridgeImp * imp_; }; class AImp : public BridgeImp{ // implementat. hierarchy public: AImp() { my_data_ = 1; }// what you need here }; class A : public Bridge{ // hierarchy public: A(){ imp_ = new AImp(); std::cout << "\tcreated a" << std::endl; }; ~A(){ delete imp_; std::cout << "\tdeleted a" << std::endl; } }; class BImp : public BridgeImp{ // implement.

However there are differences. PIMPL is a way of hiding the implementation. This is in order to break compilation dependencies. The Bridge pattern on the other hand is a way of supporting multiple implementations. In this example the class bridge has a pointer bridge_imp and the two illustrative subclasses a and b provide specific implementation by means of the a_imp and b_impi classes. Code namespace Bridge{ // // Decouple an abstraction from its implementation so that the // two can vary independently.

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