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By Dr Antonio Gulli

A set of layout styles carried out in C++

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Example: A check or bank draft is a proxy // for funds in an account. // Decorator and Proxy have different purposes // but similar structures. draw(); } Behavioural Patterns Behavioural patterns are used to describe interaction and communication among objects. Behavioural patterns are also used to handle the internal state and the internal activities of each object. 14. Implementing the Chain of responsibility pattern Solution A chain of responsibility pattern delegates a sequence of commands to a chain of processing objects.

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.

Implementing the Memento pattern Solution 20. Implementing the Observer pattern Solution 21. Implementing the State pattern Solution 22. Implementing the Strategy pattern Solution 23. Implementing the Template pattern Solution 24. Implementing the Visitor pattern Solution Design Patterns Design Patterns are a collection of logical models adopted for solving recurrent problems which are observed during the process of software development. Patterns are not dealing with core algorithms adopted by the programs but are instead providing reusable best practise solutions for a modern software design.

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