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

By Dr Antonio Gulli

ISBN-10: 1497484596

ISBN-13: 9781497484597

A suite of layout styles applied in C++

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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. In this example the class Builder is implemented according to a pure virtual method configure which is defined in each subclass for setting up the parameters used to drive each subclass building process. A set of specific tests based on different conditions can be added to the skeleton code for driving the specific action items taken by the ‘Simple Builder’ and by the ‘Advanced Builder’ respectively.

Code namespace State { // Allow an object to alter its behavior when its // internal state changes. The object will appear // to change its class. class tool{ private: class state * current_; public: void set_current(state * s) { current_ = s; }; void on(); void off(); }; class state{ public: virtual void on(tool * t){ std::cout << " state on\n"; } virtual void off(tool *t){ std::cout << " state off\n"; } }; void tool::on() { std::cout << "on is the state"; current_->on(this); } void tool::off() { std::cout << "off is the state"; current_->off(this); } class OFF : public state{ // changing state OFF->on public: void on(tool * t); }; class ON : public state{ // changing state off->ON public: void off(tool * t){ std::cout << "\tgoing from ON to OFF" << std::endl; t->set_current(new OFF()); delete this; } }; void OFF::on(tool * t){ std::cout << "\tgoing from OFF to ON" << std::endl; t->set_current(new ON()); delete this; } }; // end State void testState() { using namespace Behavioural_Patterns::State; Tool * t = new Tool(); ON * on = new ON(); t->set_current(on); on->off(t); delete t; } 22.

For instance this pattern has been used for implementing java JDBC drivers[3]. In this simplified example we allocated a cache of three objects but decided to adopt a very naïve cache policy which always returns the first object in the cache. More sophisticate allocation strategies can be adopted according to different needs. Also, locking strategies should be adopted in a multi-thread environment. Code namespace Object_Pool{ // Object pools are used to manage the object caching. // A client with access to an Object pool can avoid // creating a new Objects by simply asking the pool // for one that has already been instantiated instead.

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

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