/*

* C++ Design Patterns: Prototype

* Author: Jakub Vojvoda [github.com/JakubVojvoda]

* 2016

*

* Source code is licensed under MIT License

* (for more details see LICENSE)

*

*/

#include <iostream>

/*

* Prototype

* declares an interface for cloning itself

*/

class Prototype {

public:

virtual Prototype *clone() = 0;

virtual std::string type() = 0;

// ...

};

/*

* Concrete Prototype A and B

* implement an operation for cloning itself

*/

class ConcretePrototypeA : public Prototype {

public:

Prototype *clone() {

return new ConcretePrototypeA;

}

std::string type() {

return "type A";

}

// ...

};

class ConcretePrototypeB : public Prototype {

public:

Prototype *clone() {

return new ConcretePrototypeB;

}

std::string type() {

return "type B";

}

// ...

};

/*

* Client

* creates a new object by asking a prototype to clone itself

*/

class Client {

public:

static Prototype* make(int index) {

return types[index]->clone();

}

// ...

private:

static Prototype* types[2];

};

Prototype* Client::types[] =

{

new ConcretePrototypeA,

new ConcretePrototypeB

// ...

};

int main()

{

Prototype* prototype;

prototype = Client::make(0);

std::cout << "Prototype: " << prototype->type() << std::endl;

prototype = Client::make(1);

std::cout << "Prototype: " << prototype->type() << std::endl;

return 0;

}