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Copy pathfactor_method.cpp
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101 lines (87 loc) · 1.81 KB
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/*!
* \brief. Factory method. Use multiple factories for
* multiple products
*
* \pattern. Factory method:
* Define an interface for creating an object,
* but let subclasses decide which class to
* instantiate.Factory Method lets a class defer
* instantiation to subclasses.
*
* AbstractProduct < = > AbstractFactory
* | | | |
* ProductA ProductB FactoryA(for ProductA) FactoryB(for ProductB)
*/
#include <iostream>
#include <memory>
// AbstractProduct
class Animal {
public:
virtual void GetSpecies() {
printf("Animal.\n");
}
static Animal *Create() {
Animal *t = new Animal();
return t;
}
};
// Product
class Lion : public Animal {
public:
Lion() :age(0) {}
void GetSpecies() {
printf("Lion. age: %d\n", age++);
}
static Animal *Create() {
Animal *t = new Lion();
return t;
}
private:
int age;
};
class Tiger : public Animal {
public:
void GetSpecies() {
printf("Tiger.\n");
}
static Animal *Create() {
Animal *t = new Tiger();
return t;
}
};
// AbstractFactory
class AnimalFactory {
public:
virtual Animal *CreateAnimal() {
return Animal::Create();
}
};
// Factory
class LionFactory : public AnimalFactory {
public:
Animal *CreateAnimal() {
return Lion::Create();
}
};
class TigerFactory : public AnimalFactory {
public:
Animal *CreateAnimal() {
return Tiger::Create();
}
};
int main() {
AnimalFactory *factory = NULL;
Animal *animal = NULL;
factory = new LionFactory();
animal = factory->CreateAnimal();
animal->GetSpecies();
animal->GetSpecies();
delete animal;
delete factory;
factory = new TigerFactory();
animal = factory->CreateAnimal();
animal->GetSpecies();
delete animal;
delete factory;
return 0;
}