c++ 简单工厂模式 示例

一、示例结构

二、示例代码

cat.h

#pragma once
#include "productBase.h"

class cat : public productBase
{
public:
	cat();
	~cat();

	virtual void printProductInfo();

	virtual void printEatFood();

	void catVoice();
};

dog.h

#pragma once
#include "productBase.h"
class dog :public productBase
{
public:
	dog();
	~dog();

	virtual void printProductInfo();
	virtual void printEatFood();

	void dogVoice();
};

animalFactory.h

#pragma once
#include "productBase.h"

class animalFactory
{
public:
	animalFactory();
	~animalFactory();

	productBase* createAnimal(productsType type);
};

productBase.h

#pragma once
#include <iostream>

//抽象类
enum productsType 
{
	_cat,
	_dog,
	_tiger,
	_monkey,
};

class productBase
{
public:
	productBase();
	~productBase();
	virtual void printProductInfo() = 0;
	virtual void printEatFood() = 0;
};

cat.cpp

#include "cat.h"

cat::cat()
{
	std::cout << "cat::cat()nn";
}

cat::~cat()
{
	std::cout << "cat::~cat()nn";
}

void cat::printProductInfo()
{
	std::cout << "This is new cat!nn";
}

void cat::printEatFood()
{
	std::cout << "cat eat fish.nn";
}

void cat::catVoice()
{
	std::cout << "cat voice: miao~miao~miao~nn";
}

dog.cpp

#include "dog.h"

dog::dog()
{
	std::cout << "dog::dog()nn";
}

dog::~dog()
{
	std::cout << "dog::~dog()nn";
}

void dog::printProductInfo()
{
	std::cout << "This is new dog!nn";
}

void dog::printEatFood()
{
	std::cout << "dog eat bone.nn";
}

void dog::dogVoice()
{
	std::cout << "dog voice: wang~wang~wang~nn";
}

animalFactory.cpp

#include "animalFactory.h"
#include "cat.h"
#include "dog.h"

animalFactory::animalFactory(){}

animalFactory::~animalFactory(){}

productBase* animalFactory::createAnimal(productsType type)
{
	switch (type)
	{
    case _cat:
        return (new cat());
        break;
    case _dog:
        return (new dog());
        break;
    case _tiger:
        break;
    case _monkey:
        break;
    default:
        break;
	}
}

main.cpp

#include <iostream>
#include "animalFactory.h"
#include "cat.h"
#include "dog.h"

int main()
{
    animalFactory factory;

    productBase* newCat = factory.createAnimal(_cat);                   //基类的指针指向子类的对象，先构造基类，再构造子类
    productBase* newDog = factory.createAnimal(_dog);                   //基类的指针指向子类的对象，先构造基类，再构造子类

    newCat->printProductInfo();                                         //指向子类对象的基类指针 调用基类的纯虚方法，实则调用的是子类实现的方法（即多态）
    newCat->printEatFood();                                             //指向子类对象的基类指针 调用基类的纯虚方法，实则调用的是子类实现的方法（即多态
    
    newDog->printProductInfo();                                         //同上
    newDog->printEatFood();



    cat* m_cat = new cat();                                             //正常情况下，new子类的对象实例，构造顺序：先构造基类，再构造子类
    m_cat->catVoice();                                                  //正常情况下，调用对象的方法
    m_cat->printEatFood();                                              //正常情况下，调用对象的方法

    dog* m_dog = new dog();                                             //正常情况下，new对象实例，构造顺序：先构造基类，再构造子类
    m_dog->dogVoice();                                                  //正常情况下，调用对象的方法                            

    delete newCat;                                                      //正常析构基类对象
    newCat = NULL;
    delete newDog;                                                      //正常析构基类对象
    newDog = NULL;

    delete m_cat;                                                       //析构子类时，其顺序与构造时相反：先析构子类，再析构基类
    m_cat = NULL;
    delete m_dog;                                                       //析构子类时，其顺序与构造时相反：先析构子类，再析构基类
    m_dog = NULL;
}

productBase.cpp

#include "productBase.h"

productBase::productBase()
{
	std::cout << "productBase::productBase()nn";
}

productBase::~productBase()
{
	std::cout << "productBase::~productBase()nn";
}

三、更多参考

https://blog.csdn.net/silangquan/article/details/20492293

最后

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