实现

#include <iostream>
#include <memory>// 抽象产品类
class Product {public:virtual ~Product() {}virtual void Operation() const = 0;
};// 具体产品 类A
class ConcreteProductA : public Product {public:virtual void Operation() const override {std::cout << "Product A" << std::endl;}
};// 具体产品 类B
class ConcreteProductB : public Product {public:virtual void Operation() const override {std::cout << "Product B" << std::endl;}
};enum class ProductType: uint8_t {ProductA = 0,ProductB = 1
};// 工厂类
class Factory {public:Product *CreateProduct(enum ProductType type) const {switch(type) {case ProductType::ProductA:return new ConcreteProductA;case ProductType::ProductB:return new ConcreteProductB;default:throw std::invalid_argument("Invalid product type");}}	
};int main(int argc, char **argv)
{Factory factory;// 创建产品 AConcreteProductA *productA = reinterpret_cast<ConcreteProductA*>(factory.CreateProduct(ProductType::ProductA));productA->Operation();delete productA;// 创建产品 BConcreteProductB* productB = reinterpret_cast<ConcreteProductB*>(factory.CreateProduct(ProductType::ProductB));productB->Operation();delete productB;return 0;
}

#include <iostream>
#include <memory>// 抽象产品类
class Product {public:virtual ~Product() {}virtual void Operation() const = 0;
};// 具体产品 类A
class ConcreteProductA : public Product {public:virtual void Operation() const override {std::cout << "Product A" << std::endl;}
};// 具体产品 类B
class ConcreteProductB : public Product {public:virtual void Operation() const override {std::cout << "Product B" << std::endl;}
};// 抽象工厂类
class Factory {public:virtual ~Factory(){}virtual Product *CreateProduct() = 0;	
};// A类工厂
class ProductAFactory: public Factory  {public:virtual Product *CreateProduct() override {return new ConcreteProductA();}
};// B类工厂
class ProductBFactory: public Factory  {public:virtual Product *CreateProduct() override {return new ConcreteProductB();}
};int main(int argc, char **argv)
{Factory *a_factory = new ProductAFactory();Factory *b_factory = new ProductBFactory();auto a_product = a_factory->CreateProduct();auto b_product = b_factory->CreateProduct();a_product->Operation();b_product->Operation();delete a_product;delete b_product;delete a_factory;delete b_factory;return 0;
}