命令模式

【1】什么是命令模式？

命令模式：

【2】命令模式的代码示例：

代码示例：

#if 0

#include <iostream>
#include <string>
using namespace std;

/*
 * 运算基类
 */
class Operation
{
public:
    double numberA;
    double numberB;
public:
    virtual double  getResult()
    {
        return 0;
    }
};

/*
 * 加法运算子类
 */
class addOperation : public Operation
{
    double getResult()
    {
        return numberA + numberB;
    }
};

 /*
  * 减法运算子类
  */
class subOperation : public Operation
{
    double getResult()
    {
        return numberA - numberB;
    }
};

 /*
  * 乘法运算子类
  */
class mulOperation : public Operation
{
    double getResult()
    {
        return numberA * numberB;
    }
};

 /*
  * 除法运算子类
  */
class divOperation : public Operation
{
    double getResult()
    {
        return numberA / numberB;
    }
};

 /*
  * 简单构建工厂
  */
class operFactory
{
public:
    static Operation *createOperation(char c)
    {
        switch (c)
        {
        case '+':
            return new addOperation;
            break;
        case '-':
            return new subOperation;
            break;
        case '*':
            return new mulOperation;
            break;
        case '/':
            return new divOperation;
            break;
        default:
            break;
        }
    }
};

 /*
  * 客户端应用示例
  */
void main()
{
    Operation *oper = operFactory::createOperation('+');
    oper->numberA = 9;
    oper->numberB = 99;
    cout << oper->getResult() << endl;
}

 /*
  * 简单工厂模式应用示例
  */
#include <iostream>
#include <cmath>
#include <string>
using namespace std;

class CashSuper
{
public:
    virtual double acceptMoney(double money) = 0;
};

class CashNormal : public CashSuper
{
public:
    double acceptMoney(double money)
    {
        return money;
    }
};

class CashRebate : public CashSuper
{
private:
    double discount;
public:
    CashRebate(double dis)
    {
        discount = dis;
    }
    double acceptMoney(double money)
    {
        return money * discount;
    }
};


class CashReturn : public CashSuper
{
private:
    double moneyCondition;
    double moneyReturn;
public:
    CashReturn(double mc, double mr)
    {
        moneyCondition = mc;
        moneyReturn = mr;
    }
    double acceptMoney(double money)
    {
        double result = money;
        if (money >= moneyCondition)
        {
            result = money - floor(money / moneyCondition) * moneyReturn;
        }
        return result;
    }
};

class CashFactory
{
public:
    static CashSuper *createCashAccept(string str)
    {
        CashSuper *cs = NULL;
        if ("正常收费" == str)
        {
            return new CashNormal();
        }
        else if ("打9折" == str)
        {
            return new CashRebate(0.9);
        }
        else if ("满300返200" == str)
        {
            return new CashReturn(300, 200);
        }
        return cs;
    }
};


void main()
{
    CashSuper *cs = NULL;
    
    cs = CashFactory::createCashAccept("打9折");
    cout << cs->acceptMoney(1000) << endl;

    cs = CashFactory::createCashAccept("正常收费");
    cout << cs->acceptMoney(1000) << endl;
}




 /*
  * 策略模式
  */

#include <iostream>
#include <cmath>
#include <string>
using namespace std;

class CashSuper
{
public:
    virtual double acceptMoney(double money) = 0;
};

class CashNormal : public CashSuper
{
public:
    double acceptMoney(double money)
    {
        return money;
    }
};

class CashRebate : public CashSuper
{
private:
    double discount;

public:
    CashRebate(double dis)
    {
        discount = dis;
    }
    double acceptMoney(double money)
    {
        return money * discount;
    }
};


class CashReturn : public CashSuper
{
private:
    double moneyCondition;
    double moneyReturn;

public:
    CashReturn(double mc, double mr)
    {
        moneyCondition = mc;
        moneyReturn = mr;
    }
    double acceptMoney(double money)
    {
        double result = money;
        if (money >= moneyCondition)
        {
            result = money - floor(money / moneyCondition) * moneyReturn;
        }
        return result;
    }
};

class  CashContext
{
private:
    CashSuper *cs;
public:
    CashContext(CashSuper *cs)
    {
        this->cs = cs;
    }
    double getResult(double money)
    {
        return cs->acceptMoney(money);
    }
};

void main()
{
    CashSuper *cs;
    CashContext *cc;
    double money = 1000;

    cs = new CashRebate(0.8);
    cc = new CashContext(cs);
    cout << cc->getResult(money) << endl;

    money = 1000;
    cs = new CashNormal();
    cc = new CashContext(cs);
    cout << cc->getResult(money) << endl;

}



 /*
  * 策略与工厂模式
  */
#include <iostream>
#include <cmath>
#include <string>
using namespace std;

class CashSuper
{
public:
    virtual double acceptMoney(double money) = 0;
};

class CashNormal : public CashSuper
{
public:
    double acceptMoney(double money)
    {
        return money;
    }
};

class CashRebate : public CashSuper
{
private:
    double discount;
public:
    CashRebate(double dis)
    {
        discount = dis;
    }
    double acceptMoney(double money)
    {
        return money * discount;
    }
};


class CashReturn : public CashSuper
{
private:
    double moneyCondition;
    double moneyReturn;
public:
    CashReturn(double mc, double mr)
    {
        moneyCondition = mc;
        moneyReturn = mr;
    }
    double acceptMoney(double money)
    {
        double result = money;
        if (money >= moneyCondition)
        {
            result = money - floor(money / moneyCondition) * moneyReturn;
        }
        return result;
    }
};

class  CashContext
{
private:
    CashSuper *cs;
public:
    CashContext(string str)
    {
        if ("正常收费" == str)
        {
            cs = new CashNormal();
        }
        else if ("打9折" == str)
        {
            cs = new CashRebate(0.9);
        }
        else if ("满300送200" == str)
        {
            cs = new CashReturn(300, 200);
        }        
    }
    double getResult(double money)
    {
        return cs->acceptMoney(money);
    }
};


int main()
{
    double money = 1000;
    CashContext *cc = new CashContext("打9折");
    cout << cc->getResult(money);
    return 0;
}


#include <string>
#include <iostream>
using namespace std;

class Person
{
private:
    string m_strName;
public:
    Person(string strName)
    {
        m_strName = strName;
    }

    Person(){}

    virtual void show()
    {
        cout << "装扮的是:" << m_strName << endl;
    }
};    

class Finery : public Person
{
protected:
    Person *m_component;
public:
    void decorate(Person* component)
    {
        m_component = component;
    }
    virtual void show()
    {
        m_component->show();
    }
};

class TShirts : public Finery
{
public:
    virtual void show()
    {
        m_component->show();
        cout << "T shirts" << endl;
    }
};

class BigTrouser : public Finery
{
public:
    virtual void show()
    {
        m_component->show();
        cout << "Big Trouser" << endl;
    }
};

int main()
{
    Person *p = new Person("小李");
    BigTrouser *bt = new BigTrouser();
    TShirts *ts = new TShirts();
        
    bt->decorate(p);
    ts->decorate(bt);
    ts->show();

    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class SchoolGirl
{
public:
    string name;
};

/*
 * 接口
 */
class IGiveGift
{
public:
    virtual void giveDolls() = 0;
    virtual void giveFlowers() = 0;
};

/*
 * 委托类
 */
class Pursuit : public IGiveGift
{
private:
    SchoolGirl mm;

public:
    Pursuit(SchoolGirl m)
    {
        mm = m;
    }
    void giveDolls()
    {
        cout << mm.name << " 送你娃娃" << endl;    
    }
    void giveFlowers()
    {
        cout << mm.name << " 送你鲜花" << endl;    
    }
};

/*
 * 代理类
 */
class Proxy : public IGiveGift
{
private:
    Pursuit gg;

public:
    Proxy(SchoolGirl mm) : gg(mm)
    {
    }
    void giveDolls()
    {
        gg.giveDolls();
    }
    void giveFlowers()
    {
        gg.giveFlowers();
    }
};

/*
 * 客户端
 */
int main()
{
    SchoolGirl lijiaojiao;
    lijiaojiao.name = "李娇娇"; 
    Pursuit zhuojiayi(lijiaojiao); 
    Proxy daili(lijiaojiao);

    daili.giveDolls();
    daili.giveFlowers();

    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class Operation
{
public:
    double numberA;
    double numberB;

    virtual double getResult()
    {
        return 0;
    }
};

class addOperation : public Operation
{
    double getResult()
    {
        return numberA + numberB;
    }
};

 
class subOperation : public Operation
{
    double getResult()
    {
        return numberA - numberB;
    }
};

class mulOperation : public Operation
{
    double getResult()
    {
        return numberA * numberB;
    }
};

class divOperation : public Operation
{
    double getResult()
    {
        return numberA / numberB;
    }
};

class IFactory
{
public:
    virtual Operation *createOperation() = 0;
};

class AddFactory : public IFactory
{
public:
    static Operation *createOperation()
    {
        return new addOperation();
    }
};


class SubFactory : public IFactory
{
public:
    static Operation *createOperation()
    {
        return new subOperation();
    }
};

class MulFactory : public IFactory
{
public:
    static Operation *createOperation()
    {
        return new mulOperation();
    }
};

class DivFactory : public IFactory
{
public:
    static Operation *createOperation()
    {
        return new divOperation();
    }
};

int main()
{
    Operation *oper = MulFactory::createOperation();
    oper->numberA = 9;
    oper->numberB = 99;
    cout << oper->getResult() << endl;
    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class Prototype
{
private:
    string str;
public:
    Prototype(string s)
    {
        str = s;
    }
    Prototype()
    {
        str = "";
    }
    void show()
    {
        cout << str << endl;
    }
    virtual Prototype *clone() = 0;
};

class ConcretePrototype1 : public Prototype
{
public:
    ConcretePrototype1(string s) : Prototype(s)
    {}
    ConcretePrototype1(){}
    virtual Prototype *clone()
    {
        ConcretePrototype1 *p = new ConcretePrototype1();
        *p = *this;
        return p;
    }
};


class ConcretePrototype2 : public Prototype
{
public:
    ConcretePrototype2(string s) : Prototype(s)
    {}
    ConcretePrototype2(){}
    virtual Prototype *clone()
    {
        ConcretePrototype2 *p = new ConcretePrototype2();
        *p = *this;
        return p;
    }
};

int main()
{
    ConcretePrototype1 *test = new ConcretePrototype1("小李");
    ConcretePrototype2 *test2 = (ConcretePrototype2 *)test->clone();
    test->show();
    test2->show();
    return 0;
}

#include <iostream>
#include <string>
using namespace std;
 
class Resume
{
private:
    string name, sex, age, timeArea, company;
public:
    Resume(string s)
    {
        name = s;
    }
    void setPersonalInfo(string s, string a)
    {
        sex = s;
        age = a;
    }
    void setWorkExperience(string t, string c)
    {
        timeArea = t;
        company = c;
    }
    void display()
    {
        cout << name << "  " << sex << "  " << age << endl;
        cout << "工作经历:  " << timeArea << "  " << company << endl;

    }
    Resume *clone()
    {
        Resume *b = new Resume(name);
        b->setPersonalInfo(sex, age);
        b->setWorkExperience(timeArea, company);
        return b;
    }
};


int main()
{
    Resume *r = new Resume("李俊宏");      
    r->setPersonalInfo("男","26");
    r->setWorkExperience("2007-2010","读研究生");
    r->display();
    

    Resume *r2 = r->clone();
    r2->setWorkExperience("2003-2007","读本科");
    
    r->display();
    r2->display();
    
    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class TestPaper
{
public:
    void question1()
    {
        cout << "1+1=" << answer1() << endl;
    }
    void question2()
    {
        cout << "1*1=" << answer2() << endl;
    }
    virtual string answer1()
    {
        return "";
    }
    virtual string answer2()
    {
        return "";
    }
    virtual ~TestPaper()
    {
    }
};

class TestPaperA : public TestPaper
{
public:
    string answer1()
    {
        return "2";
    }
    virtual string answer2()
    {
        return "1";
    }
};

class TestPaperB : public TestPaper
{
public:
    string answer1()
    {
        return "3";
    }
    virtual string answer2()
    {
        return "4";
    }
};


int main()
{
    cout << "A的试卷:" << endl;
    TestPaper *s1 = new TestPaperA();
    s1->question1();
    s1->question2();
    delete s1;

    cout << endl;
    cout << "B的试卷:" << endl;
    TestPaper *s2 = new TestPaperB();
    s2->question1();
    s2->question2();

    return 0;
}

#include<iostream>
#include <vector>
#include <string>
using namespace std;

class AbstractClass
{
public:
    void Show()
    {
        cout << "我是" << GetName() << endl;
    }
protected:
    virtual string GetName() = 0;
};

class Naruto : public AbstractClass
{
protected:
    virtual string GetName()
    {
        return "火影史上最帅的六代目---一鸣惊人naruto";
    }
};

class OnePice : public AbstractClass
{
protected:
    virtual string GetName()
    {
        return "我是无恶不做的大海贼---路飞";
    }
};

//客户端
int main()
{
    Naruto* man = new Naruto();
    man->Show();

    OnePice* man2 = new OnePice();
    man2->Show();

    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class Sub1
{
public:
    void f1()
    {
        cout << "子系统的方法 1" << endl;
    }
};

class Sub2
{
public:
    void f2()
    {
        cout << "子系统的方法 2" << endl;
    }
};

class Sub3
{
public:
    void f3()
    {
        cout << "子系统的方法 3" << endl;
    }
};

class Facade
{
private:
    Sub1 *s1;
    Sub2 *s2;
    Sub3 *s3;
public:
    Facade()
    {
        s1 = new Sub1();
        s2 = new Sub2();
        s3 = new Sub3();
    }

    void method()
    {
        s1->f1();
        s2->f2();
        s3->f3();
    }

    ~Facade()
    {
        if (s1)
            delete s1;
        if (s2)
            delete s2;
        if (s3)
            delete s3;
    }
};

int main()
{
    Facade *f = new Facade();
    f->method();
    return 0;
}

#include <string>
#include <iostream>
#include <vector>
using namespace std;

class Person
{
public:
    virtual void createHead() = 0;
    virtual void createHand() = 0;
    virtual void createBody() = 0;
    virtual void createFoot() = 0;
};

class ThinPerson : public Person
{
    void createHead()
    {
        cout << "thin head" << endl;
    }
    void createHand()
    {
        cout << "thin hand" << endl;
    }
    void createBody()
    {
        cout << "thin body" << endl;
    }
    void createFoot()
    {
        cout << "thin foot" << endl;
    }
};

class FatPerson : public Person
{
    void createHead()
    {
        cout << "fat head" << endl;
    }
    void createHand()
    {
        cout << "fat hand" << endl;
    }
    void createBody()
    {
        cout << "fat body" << endl;
    }
    void createFoot()
    {
        cout << "fat foot" << endl;
    }
};


class Director
{
private:
    Person *p;
public:
    Director(Person *temp)
    {
        p = temp;
    }
    void create()
    {
        p->createHead();
        p->createHand();
        p->createBody();
        p->createFoot();
    }
};

//客户端代码：
int main()
{
    Person *p = new FatPerson();
    Person *b = new ThinPerson();
    Director *d = new Director(p);
    Director *s = new Director(b);
    d->create();
    s->create();
    delete d;
    delete p;
    delete s;
    delete b;

    return 0;
}

#include <string>
#include <iostream>
#include <vector>
using namespace std;

class Product
{
private:
    vector<string> product;
public:
    void add(string str)
    {
        product.push_back(str);
    }
    void show()
    {
        vector<string>::iterator iter = product.begin();
        while (iter != product.end())
        {
            cout << *iter << "  ";
            ++iter;
        }
        cout << endl;
    }
};

class Builder
{
public:
    virtual void builderA() = 0;
    virtual void builderB() = 0;
    virtual Product *getResult() = 0;
};

class ConcreteBuilder1 : public Builder
{
private:
    Product *product;
public:
    ConcreteBuilder1()
    {
        product = new Product();
    }
    virtual void builderA()
    {
        product->add("one");
    }
    virtual void builderB()
    {
        product->add("two");
    }
    virtual Product *getResult()
    {
        return product;
    }
};


class ConcreteBuilder2 : public Builder
{
private:
    Product *product;
public:
    ConcreteBuilder2()
    {
        product = new Product();
    }
    virtual void builderA()
    {
        product->add("A");
    }
    virtual void builderB()
    {
        product->add("B");
    }
    virtual Product *getResult()
    {
        return product;
    }
};

class Director
{
private:
    Product *p;
public:
    void construct(Builder *bd)
    {
        bd->builderA();
        bd->builderB();
        p = bd->getResult();
    }
    Product *getResult()
    {
        return p;
    }
};

int main()
{
    Director *director = new Director();

    Builder *bd1 = new ConcreteBuilder1();
    director->construct(bd1);
    Product *pbd1 = director->getResult();

    pbd1->show();

    return 0;
}

// 观察者模式

#include <iostream>
#include <string>
#include <list>
using namespace std;

class Observer;

class Subject
{
protected:
    list<Observer*> observers;
public:
    string action;
public:
    virtual void attach(Observer*) = 0;
    virtual void detach(Observer*) = 0;
    virtual void notify() = 0;
};

class Observer
{
protected:
    string name;
    Subject *sub;
public:
    Observer(string name, Subject *sub)
    {
        this->name = name;
        this->sub = sub;
    }
    string getName()
    {
        return name;
    }
    virtual void update() = 0;
};

class StockObserver : public Observer
{
public:
    StockObserver(string name, Subject *sub) : Observer(name, sub)
    {
    }
    void update();
};

void StockObserver::update()
{
    cout << name << " 收到消息：" << sub->action << endl;
    if (sub->action == "梁所长来了!")
    {
        cout << "我马上关闭股票，装做很认真工作的样子！" << endl;
    }
}

class NBAObserver : public Observer
{
public:
    NBAObserver(string name, Subject *sub) : Observer(name, sub)
    {
    }
    void update();
};

void NBAObserver::update()
{
    cout << name << " 收到消息：" << sub->action << endl;
    if (sub->action == "梁所长来了!")
    {
        cout << "我马上关闭NBA，装做很认真工作的样子！" << endl;
    }
}

class Secretary : public Subject
{
    void attach(Observer *observer)
    {
        observers.push_back(observer);
    }
    void detach(Observer *observer)
    {
        list<Observer *>::iterator iter = observers.begin();
        while (iter != observers.end())
        {
            if ((*iter) == observer)
            {
                cout << "erase:" << observer->getName() << endl;
                observers.erase(iter++);
            }
            else
            {
                ++iter;
            }
        }
    }
    void notify()
    {
        list<Observer *>::iterator iter = observers.begin();
        while (iter != observers.end())
        {
            (*iter)->update();
            ++iter;
        }
    }
};


int main()
{
    Subject *dwq = new Secretary();

    Observer *xs = new NBAObserver("xiaoshuai", dwq);
    Observer *zy = new NBAObserver("zouyue", dwq);
    Observer *lm = new StockObserver("limin", dwq);

    dwq->attach(xs);
    dwq->attach(zy);
    dwq->attach(lm);

    dwq->action = "去吃饭了！";
    dwq->notify();
    cout << endl;

    dwq->action = "梁所长来了!";
    dwq->notify();

    dwq->detach(lm);
    dwq->detach(zy);
    dwq->detach(xs);

    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class IUser
{
public:
    virtual void getUser() = 0;
    virtual void setUser() = 0;
};

class SqlUser : public IUser
{
public:
    void getUser()
    {
        cout << "在sql中返回user" << endl;
    }
    void setUser()
    {
        cout << "在sql中设置user" << endl;
    }
};

class AccessUser : public IUser
{
public:
    void getUser()
    {
        cout << "在Access中返回user" << endl;
    }
    void setUser()
    {
        cout << "在Access中设置user" << endl;
    }
};

class IDepartment
{
public:
    virtual void getDepartment() = 0;
    virtual void setDepartment() = 0;
};

class SqlDepartment : public IDepartment
{
public:
    void getDepartment()
    {
        cout << "在sql中返回Department" << endl;
    }
    void setDepartment()
    {
        cout << "在sql中设置Department" << endl;
    }
};

class AccessDepartment : public IDepartment
{
public:
    void getDepartment()
    {
        cout << "在Access中返回Department" << endl;
    }
    void setDepartment()
    {
        cout << "在Access中设置Department" << endl;
    }
};

class IFactory
{
public:
    virtual IUser *createUser() = 0;
    virtual IDepartment *createDepartment() = 0;
};

class SqlFactory : public IFactory
{
public:
    IUser *createUser() 
    {
        return new SqlUser();
    }
    IDepartment *createDepartment() 
    {
        return new SqlDepartment();
    }
};

class AccessFactory : public IFactory
{
public:
    IUser *createUser()
    {
        return new AccessUser();
    }
    IDepartment *createDepartment() 
    {
        return new AccessDepartment();
    }
};

/*************************************************************/

class DataAccess
{
private:
    static string db;
public:
    static IUser *createUser()
    {
        if (db == "access")
        {
            return new AccessUser();
        }
        else if (db == "sql")
        {
            return new SqlUser();
        }
    }
    static IDepartment *createDepartment()
    {
        if (db == "access")
        {
            return new AccessDepartment();
        }
        else if (db == "sql")
        {
            return new SqlDepartment();
        }    
    }
};

string DataAccess::db = "sql";

/*************************************************************/

int main()
{
    IFactory *factory;
    IUser *user;
    IDepartment *department;

    factory = new AccessFactory();
    user = factory->createUser();
    department = factory->createDepartment();
    
    user->getUser();
    user->setUser();
    department->getDepartment();
    department->setDepartment();

    user = DataAccess::createUser();
    department = DataAccess::createDepartment();

    user->getUser();
    user->setUser();
    department->getDepartment();
    department->setDepartment();

    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class Work;
class State;
class ForenonnState;


class State
{
public:
    virtual void writeProgram(Work*) = 0;
};

class Work
{
public:
    int hour;
    State *current;
    Work();
    void writeProgram()
    {
        current->writeProgram(this);
    }
};

class EveningState : public State
{
public:
    void writeProgram(Work *w)
    {
        cout << "当前时间: " << w->hour << "心情很好，在看《明朝那些事儿》，收获很大！" << endl;
    }
};

class AfternoonState : public State
{
public:
    void writeProgram(Work *w)
    {
        if (w->hour < 19)
        {
            cout << "当前时间: " << w->hour << "下午午睡后，工作还是精神百倍!" << endl;
        }
        else
        {
            w->current = new EveningState();
            w->writeProgram();
        }
    }
};

class ForenonnState : public State
{
public:
    void writeProgram(Work *w)
    {
        if (w->hour < 12)
        {
            cout << "当前时间: " << w->hour << "上午工作精神百倍!" << endl;
        }
        else
        {
            w->current = new AfternoonState();
            w->writeProgram();
        }
    }
};

Work::Work()
{
    current = new ForenonnState();
}

int main()
{
    Work *w = new Work();
    w->hour = 21;
    w->writeProgram();
    return 0;
}
//Reuslt:
//当前时间: 21心情很好，在看《明朝那些事儿》，收获很大！

#include <iostream>
#include <string>
using namespace std;

class Adaptee
{
public:
    virtual void myRequest()
    {
        cout << "实际上的接口" << endl;
    }
};

class Target
{
public:
    virtual void request() = 0;
    virtual ~Target(){}
};

class Adapter : public Target
{
private:
    Adaptee adaptee;
public:
    void request()
    {
        adaptee.myRequest();
    }
};

int main()
{
    Target *target = new Adapter();
    target->request();
    delete target;
    return 0;
}
//Result:
//实际上的接口

#include <iostream>
#include <string>
using namespace std;

class Player
{
public:
    string name;
    Player(string name)
    {
        this->name = name;
    }
    virtual void attack() = 0;
    virtual void defence() = 0;
}; 

class Forwards : public Player
{
public:
    Forwards(string name) : Player(name){}
    void attack()
    {
        cout << name << "前锋进攻" << endl;
    }
    void defence()
    {
        cout << name << "前锋防守" << endl;
    }
};

class Center : public Player
{
public:
    Center(string name) : Player(name){}
    void attack()
    {
        cout << name << "中锋进攻" << endl;
    }
    void defence()
    {
        cout << name << "中锋防守" << endl;
    }
};

class Backwards : public Player
{
public:
    Backwards(string name) : Player(name){}
    void attack()
    {
        cout << name << "后卫进攻" << endl;
    }
    void defence()
    {
        cout << name << "后卫防守" << endl;
    }
};
/*****************************************************************/
class ForeignCenter
{
public:
    string name;
    ForeignCenter(string name)
    {
        this->name = name;
    }
    void myAttack()
    {
        cout << name << "外籍中锋进攻" << endl;
    }
    void myDefence()
    {
        cout << name << "外籍中锋防守" << endl;
    }
};
/*****************************************************************/
class Translator : public Player
{
private:
    ForeignCenter *fc;
public:
    Translator(string name) : Player(name)
    {
        fc = new ForeignCenter(name); 
    }
    void attack()
    {
        fc->myAttack();
    }
    void defence()
    {
        fc->myDefence();
    }
};
/*****************************************************************/
int main()
{
    Player *p1 = new Center("李俊宏");
    p1->attack();
    p1->defence();
    
    Translator *tl = new Translator("姚明");
    tl->attack();
    tl->defence();
    
    return 0;
}
//Result:
/*
李俊宏中锋进攻
李俊宏中锋防守
姚明外籍中锋进攻
姚明外籍中锋防守
*/


#include <iostream>
#include <string>
#include <vector>
using namespace std;

class Memo
{
public:
    string state;
    Memo(string state)
    {
        this->state = state;
    }
};

class Originator
{
public:
    string state;
    void setMemo(Memo *memo)
    {
        state = memo->state;
    }
    Memo *createMemo()
    {
        return new Memo(state);
    }
    void show()
    {
        cout << state << endl;
    }
};    

class Caretaker
{
public:
    vector<Memo *> memo;
public:
    void save(Memo *memo)
    {
        (this->memo).push_back(memo);
    }
    Memo *getState(int i)
    {
        return memo[i];
    }
};
 
int main()
{
    Originator *og = new Originator();
    Caretaker *ct = new Caretaker(); 

    og->state = "on";
    og->show();    
    ct->save(og->createMemo());

    og->state = "off";
    og->show();
    ct->save(og->createMemo());

    og->state = "middle";
    og->show();
    ct->save(og->createMemo());

    og->setMemo( ct->getState(1) );
    og->show();

    return 0;
}
//Result:
/*
on
off
middle
off
*/

#include <iostream>
#include <vector>
#include <string>
using namespace std;

class Component
{
public:
    string name;
    Component(string name)
    {
        this->name = name;
    }
    virtual void add(Component *) = 0;
    virtual void remove(Component *) = 0;
    virtual void display(int) = 0;
};

class Leaf : public Component
{
public:
    Leaf(string name) : Component(name)
    {}
    void add(Component *c)
    {
        cout << "leaf cannot add" << endl;
    }
    void remove(Component *c)
    {
        cout << "leaf cannot remove" << endl;
    }
    void display(int depth)
    {
        string str(depth, '-');
        str += name;
        cout << str << endl;
    }
};

class Composite : public Component
{
private:
    vector<Component*> component;
public:
    Composite(string name) : Component(name)
    {}
    void add(Component *c)
    {
        component.push_back(c);
    }
    void remove(Component *c)
    {
        vector<Component*>::iterator iter = component.begin();
        while (iter != component.end())
        {
            if (*iter == c)
            {
                component.erase(iter++);
            }
            else
            {
                iter++;
            }
        }
    }
    void display(int depth)
    {
        string str(depth, '-');
        str += name;
        cout << str << endl;

        vector<Component*>::iterator iter=component.begin();
        while (iter != component.end())
        {
            (*iter)->display(depth + 2);
            iter++;
        }
    }
};


int main()
{
    Component *p = new Composite("小李"); 
    p->add(new Leaf("小王"));
    p->add(new Leaf("小强"));

    Component *sub = new Composite("小虎"); 
    sub->add(new Leaf("小王"));
    sub->add(new Leaf("小明"));
    sub->add(new Leaf("小柳"));
    
    p->add(sub);
    p->display(0);

    cout << "*******" << endl;
    sub->display(2);

    return 0;
}
//Result:
/*
小李
--小王
--小强
--小虎
----小王
----小明
----小柳
*******
--小虎
----小王
----小明
----小柳
*/

#include <iostream>
#include <string>
using namespace std;

class Iterator;

class Aggregate
{
public:
    virtual Iterator *createIterator() = 0;
};

class Iterator
{
public:
    virtual void first() = 0;
    virtual void next() = 0;
    virtual bool isDone() = 0;
};

class ConcreteAggregate : public Iterator
{
public:
    void first()
    {}
    void next()
    {}
    bool isDone()
    {}
};

int main()
{
    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class Singleton
{    
private:
    int i;
    static Singleton *instance;
    Singleton(int i)
    {
        this->i = i;
    }
public:
    static Singleton *getInstance()
    {
        return instance;
    }
    void show()
    { 
        cout << i << endl;
    }
};

Singleton* Singleton::instance = new Singleton(8899); 

class A : public Singleton
{

};

int main()
{
    Singleton *s = Singleton::getInstance();
    Singleton *s2 = A::getInstance();
    cout << s << endl;
    cout << s2 << endl;
    cout << (s == s2) << endl;
    return 0;
}

#include <iostream>
#include <string>
using namespace std;

class HandsetSoft
{
public:
    virtual void run() = 0;
};

class HandsetGame : public HandsetSoft
{
public:
    void run()
    {
        cout << "运行手机游戏" << endl;
    }
};

class HandsetAddressList : public HandsetSoft
{
public:
    void run()
    {
        cout << "运行手机通讯录" << endl;
    }
};

class HandsetBrand
{
protected:
    HandsetSoft *soft;
public:
    void setHandsetSoft(HandsetSoft *soft)
    {
        this->soft = soft;
    }
    virtual void run() = 0;
};

class HandsetBrandN : public HandsetBrand
{
public:
    void run()
    {
        soft->run();
    }
};

class HandsetBrandM : public HandsetBrand
{
public:
    void run()
    {
        soft->run();
    }
};

int main()
{
    HandsetBrand *hb;
    hb = new HandsetBrandM();
    
    hb->setHandsetSoft(new HandsetGame());
    hb->run();
    hb->setHandsetSoft(new HandsetAddressList());
    hb->run();

    return 0;
}
#endif

#include <iostream>
#include <string>
#include <list>

using namespace std;

class Barbecuer
{
public:
    void bakeMutton()
    {
        cout << "烤羊肉串" << endl;
    }
    void bakeChickenWing()
    {
        cout << "烤鸡翅" << endl;
    }
};

class Command
{
protected:
    Barbecuer *receiver;
public:
    Command(Barbecuer *receiver)
    {
        this->receiver = receiver;
    }
    virtual void executeCommand() = 0;
};

class BakeMuttonCommand : public Command
{
public:
    BakeMuttonCommand(Barbecuer *receiver) : Command(receiver)
    {}
    void executeCommand()
    {
        receiver->bakeMutton();
    }
};

class BakeChikenWingCommand : public Command
{
public:
    BakeChikenWingCommand(Barbecuer *receiver) : Command(receiver)
    {}
    void executeCommand()
    {
        receiver->bakeChickenWing();
    }
};

class Waiter
{
private:
    Command *command;
public:
    void setOrder(Command *command)
    {
        this->command = command;
    }
    void notify()
    {
        command->executeCommand();
    }
};

class Waiter2
{
private:
    list<Command*> orders;
public:
    void setOrder(Command *command)
    {
        orders.push_back(command);
    }
    void cancelOrder(Command *command) 
    {}
    void notify()
    {
        list<Command*>::iterator iter = orders.begin();
        while (iter != orders.end())
        {
            (*iter)->executeCommand();
            iter++;
        }
    }
};


int main()
{
    Barbecuer *boy = new Barbecuer();
    Command *bm1 = new BakeMuttonCommand(boy);
    Command *bm2 = new BakeMuttonCommand(boy);
    Command *bc1 = new BakeChikenWingCommand(boy);
    
    cout << "Waiter2:" << endl;
    Waiter2 *girl2 = new Waiter2();

    girl2->setOrder(bm1);
     girl2->setOrder(bc1);
     girl2->setOrder(bm2);
    
    girl2->notify();
    
    cout << "Waiter:" << endl;
    Waiter *girl = new Waiter();

    girl->setOrder(bm1);
    girl->notify();

    girl->setOrder(bm2);
    girl->notify();

    girl->setOrder(bc1);
    girl->notify();

    return 0;
}
//Result:
/*
Waiter2:
烤羊肉串
烤鸡翅
烤羊肉串
Waiter:
烤羊肉串
烤羊肉串
烤鸡翅
*/

http://www.cnblogs.com/Braveliu/p/3956683.html