设计模式——工厂模式

★★★原文链接★★★：https://subingwen.cn/design-patterns/factory/

工厂模式

简单工厂  工厂和对象的关系：一对多

工厂模式  工厂和对象的关系：一对一

示例：

#include <iostream>
using namespace std;

// 产品类的父类 - 人造恶魔果实父类
class AbstractSmile {
public:
	virtual void transform() = 0;
	virtual void ability() = 0;
	virtual ~AbstractSmile() {}	// 虚析构函数
};
// 1
class SheepSmile :public AbstractSmile
{
public:
	void transform() override {	// override检查子类重写的虚函数的名字和父类的是否相同(相同是正确的)
		cout << "SheepSmile transform" << endl;
	}
	void ability() override {
		cout << "SheepSmile ability" << endl;
	}
};
// 2
class LionSmile :public AbstractSmile
{
public:
	void transform() override {	// override检查子类重写的虚函数的名字和父类的是否相同(相同是正确的)
		cout << "LionSmile transform" << endl;
	}
	void ability() override {
		cout << "LionSmile ability" << endl;
	}
};
// 3
class BatSmile :public AbstractSmile
{
public:
	void transform() override {	// override检查子类重写的虚函数的名字和父类的是否相同(相同是正确的)
		cout << "BatSmile transform" << endl;
	}
	void ability() override {
		cout << "BatSmile ability" << endl;
	}
};

// 定义工厂类 - 抽象父类
class AbstractFactory {
public:
	virtual AbstractSmile* createSmile() = 0;
	virtual ~AbstractFactory(){}
};

// 生产SheepSmile
class SheepFactory :public AbstractFactory
{
public:
	AbstractSmile* createSmile() {
		return new SheepSmile;
	}
	~SheepFactory() {
		cout << "SheepFactory 析构函数调用" << endl;
	}
};

// 生产LionSmile
class LionFactory :public AbstractFactory
{
public:
	AbstractSmile* createSmile() {
		return new LionSmile;
	}
	~LionFactory() {
		cout << "LionFactory 析构函数调用" << endl;
	}
};

// 生产BatSmile
class BatFactory :public AbstractFactory
{
public:
	AbstractSmile* createSmile() {
		return new BatSmile;
	}
	~BatFactory() {
		cout << "BatFactory 析构函数调用" << endl;
	}
};
int main() {
	// 创建工厂类对象
	AbstractFactory* factory = new LionFactory;
	AbstractSmile* obj = factory->createSmile();
	obj->transform();
	obj->ability();
	
	delete factory;
	delete obj;

	return 0;
}

res：

工厂模式的“工厂”：

1. 一个基类，包含一个虚工厂函数，用于实现多态。

2. 多个子类，重写父类的工厂函数。

★★★原文链接★★★：https://subingwen.cn/design-patterns/factory/

(〃＞＿＜;〃)(〃＞＿＜;〃)(〃＞＿＜;〃)