工厂方法入门


#include <iostream>// 定义抽象交通工具的基类
// 产品的接口
class Transport {
public:virtual~Transport() {}; // 虚的析构函数virtual void deliver() const = 0; // 纯虚函数
};// 定义卡车交通工具，继承交通工具
// 产品 A 
class Truck :public Transport {
public:void deliver() const override            // 继承过来的{std::cout << "卡车运输 ..." << std::endl;}};// 定义轮船交通工具，继承交通工具
// 产品 B
class Ship :public Transport {
public:void deliver() const override{std::cout << "轮船运输 ..." << std::endl;}
};// 物流公司
// 创造者
class Logistics
{
public:virtual ~Logistics() {};   // 虚的析构函数// 工厂方法的核心virtual Transport* factoryMethold() const = 0;  // 物流公司创建工厂方法，基类void doSomething(){Transport* transport = factoryMethold();transport->deliver();delete transport;       // 释放指针}
};// 卡车继承物流公司的工程方法，new Truck
// 具体的创造者 A
class TruckLogistics : public Logistics 
{
public:virtual ~TruckLogistics() {};   // 虚的析构函数Transport* factoryMethold() const override{return new Truck();}
};// 轮船继承物流公司的工程方法，new Ship
// 具体的创造者 B
class ShipLogistics : public Logistics
{
public:virtual ~ShipLogistics() {};   // 虚的析构函数Transport* factoryMethold() const override{return new Ship();}};// 实现创建这就和产品松耦合
int main()
{Logistics* truckLogistics = new TruckLogistics();truckLogistics->doSomething();delete truckLogistics;Logistics* shipLogistics = new ShipLogistics();shipLogistics->doSomething();delete shipLogistics;return 0;
}