flyweight模式

#include <iostream>
#include <map>
#include <string>
#include <cstring>
#include <string.h>
#include <cstdlib>
using namespace std;

class Book {
public:
    string GetPublish() {
        return *m_publishCompany;
    }
    string GetWriter() {
        return *m_writer;
    }
    int GetBookID() {
        return m_bookID;
    }
    int GetPrice() {
        return m_price;
    }
    string GetName() {
        return m_name;
    }

    void SetPublish(string *s) {
        m_publishCompany = s;
    }
    void SetWriter(string *s) {
        m_writer = s;
    }
    void SetBookID(int id) {
        m_bookID = id;
    }
    void SetPrice(int price) {
        m_price = price;
    }
    void SetName(string s) {
        m_name = s;
    }

private:
    string *m_publishCompany; // 出版社
    string *m_writer; // 作者
    int m_bookID; // 书籍编号
    int m_price; // 价钱
    string m_name; // 书名
};

class PublishFlyweight {
public:
    PublishFlyweight(string s) {
        m_name = s;
    }
    string* GetName() {
        return &m_name;
    }

private:
    string m_name;
};

class PublishFlyweightFactory {
public:
    PublishFlyweight* GetPublish(string key) {
        PublishFlyweight *p;
        map<string, PublishFlyweight*>::iterator it;
        it = mapPublish.find(key);

        // 存在这个出版社
        if (it != mapPublish.end()) {
            // 这里可能有点难懂，请查阅ＳＴＬ的帮助文档
            // 其实second就是指 map<string, PublishFlyweight*> 的 PublishFlyweight*
            p = (*it).second;
            cout << "已经有这个出版社: " << *(p->GetName()) << " 你节省了" << strlen((*(p->GetName())).c_str()) << "字节的空间" << endl;
        }

        else { // 插入这个PublishFlyweight

            p = new PublishFlyweight(key);
            mapPublish[key] = p;
        }

        return p;
    }

private:
    map<string, PublishFlyweight*> mapPublish;
};

class WriterFlyweight {
public:
    WriterFlyweight(string s) {
        m_name = s;
    }
    string* GetName() {
        return &m_name;
    }

private:
    string m_name;
};

class WriterFlyweightFactory {
public:
    WriterFlyweight* GetWriter(string key) {
        WriterFlyweight *p;
        map<string, WriterFlyweight*>::iterator it;
        it = mapWriter.find(key);

        // 存在这个Writer
        if (it != mapWriter.end()) {
            // 这里可能有点难懂，请查阅ＳＴＬ的帮助文档
            // 其实second就是指 map<string, WriterFlyweight*> 的 WriterFlyweight*
            p = (*it).second;
            cout << "已经有这个作者名字: " << *(p->GetName()) << " 你节省了"
                    << strlen((*(p->GetName())).c_str()) << "字节的空间" << endl;
        }

        else { // 插入这个PublishFlyweight

            p = new WriterFlyweight(key);
            mapWriter[key] = p;
        }

        return p;
    }

private:
    map<string, WriterFlyweight*> mapWriter;
};

void ShowBookInfo(Book book) {
    cout << "书名：" << book.GetName() << endl;
    cout << "编号：" << book.GetBookID() << endl;
    cout << "价钱：" << book.GetPrice() << endl;
    cout << "出版：" << book.GetPublish() << endl;
    cout << "作者：" << book.GetWriter() << endl;
    cout << endl;
}

int main() {
    PublishFlyweightFactory pff;
    WriterFlyweightFactory wff;
    Book book1, book2, book3;

    book1.SetPublish(pff.GetPublish("机械工业出版社")->GetName());
    book1.SetWriter((wff.GetWriter("候捷")->GetName()));
    book1.SetBookID(0000);
    book1.SetPrice(20);
    book1.SetName(string("<<C++好野>>"));

    ShowBookInfo(book1);

    book2.SetPublish((pff.GetPublish("人民邮电出版社")->GetName()));
    book2.SetWriter((wff.GetWriter("候捷")->GetName()));
    book2.SetBookID(0001);
    book2.SetPrice(30);
    book2.SetName(string("<<C++是好劲>>"));

    ShowBookInfo(book2);

    book3.SetPublish((pff.GetPublish("机械工业出版社")->GetName()));
    book3.SetWriter((wff.GetWriter("一雨田")->GetName()));
    book3.SetBookID(0002);
    book3.SetPrice(50);
    book3.SetName(string("<<C++无得顶，我是铁头功...>>"));

    ShowBookInfo(book3);
    return 0;
}