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抽象工厂模式

抽象工厂是负责多个配套类的统一创建，某些类我希望他们配套使用，比如说衣服，当我指定了要穿西装，如果我要穿衣服（？），那么我希望创建的是配套的西装上衣和西装裤子，而不是西装上衣配个大裤衩子。

// Coat.h//衣服抽象类#pragma onceclass Coat{
   public:    virtual void wear() = 0;}

//Pants.h//裤子抽象类#pragma onceclass Pant{
   public:    virtual void wear() = 0;}

//CoatImpl.h#pragma once#include "Coat.h"#include 
   
    //西装上衣class SuitCoat final : public Coat{
   public:    virtual void wear() override    {
           std::cout << "Wear suit coat." << std::endl;    }}//背心class Tank final : public Coat{
   public:    virtual void wear() override    {
           std::cout << "Wear tank." << endl;    }}
   

//PantsImpl.h#pragma once#include "Pants.h"#include 
   
    //西装裤子class SuitPants final : public Pants{
   public:    virtual void wear() override    {
           std::cout << "Wear suit pants." << std::endl;    }}//运动裤class SportsShorts final : public Pants{
   public:    virtual void wear() override    {
           std::cout << "Wear sports shorts." << endl;    }}
   

//Factory.h#pragma once#include "Coat.h"#include "Pants.h"//抽象工厂类class AbstractFactory{
   public:    virtual Coat*  getCoat()  = 0;    virtual Pants* getPants() = 0;}//西装工厂class SuitFactory final : public AbstractFactory{
   public:    virtual Coat*  getCoat()  override;    virtual Pants* getPants() override;}//运动装工厂class SportsFactory final : public AbstractFactory{
   public:    virtual Coat*  getCoat()  override;    virtual Pants* getPants() override;}

//Factory.cpp#include "Factory.h"#include "CoatImpl.h"#include "PantsImpl.h"virtual Coat* SuitFactory::getCoat() override{
       return new SuitCoat();}virtual Pants* SuitFactory::getPants() override{
       return new SuitPants();}virtual Coat* SportsFactory::getCoat() override{
       return new Tank();}virtual Pants* SportsFactory::getPants() override{
       return new SportsShorts();}

//main.cpp#include "Factory.h"int main(){
       //想穿西装    AbstractFactory* f = new SuitFactory();    Coat* coat = f->getCoat();    coat->wear();    Pants* pants = f->getPants();    pants->wear();        delete coat;    coat = nullptr;    delete pants;    pants = nullptr;    delete f;    f = nullptr;        //要去打球    f = new SportsFactory();    coat = f->getCoat();    coat->wear();    pants = f->getPants();    pants->wear();        delete coat;    coat = nullptr;    delete pants;    pants = nullptr;    delete f;    f = nullptr;        return 0;}

可以看到，抽象工厂模式，当指定了工厂之后，生产的类一定配套。所以抽象工厂模式是负责生产多个配套使用的类。

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