C++ Design pattern implementation in C++ Factory Pattern
Example
Factory pattern decouples object creation and allows creation by name using a common interface:
class Animal{
public:
virtual std::shared_ptr<Animal> clone() const = 0;
virtual std::string getname() const = 0;
};
class Bear: public Animal{
public:
virtual std::shared_ptr<Animal> clone() const override
{
return std::make_shared<Bear>(*this);
}
virtual std::string getname() const override
{
return "bear";
}
};
class Cat: public Animal{
public:
virtual std::shared_ptr<Animal> clone() const override
{
return std::make_shared<Cat>(*this);
}
virtual std::string getname() const override
{
return "cat";
}
};
class AnimalFactory{
public:
static std::shared_ptr<Animal> getAnimal( const std::string& name )
{
if ( name == "bear" )
return std::make_shared<Bear>();
if ( name == "cat" )
return std::shared_ptr<Cat>();
return nullptr;
}
};
