Design Pattern之原型模式

原型模式，用原型實例指定創建對象的種類，並且通過拷貝這些原型創建新的對象。原型模式其實就是從一個對象再創建另外一個可定製的對象，而且不需要知道任何創建的細節。在C++裏，可通過拷貝構造函數實現原型模式，或者實現賦值運算符也能達到相同的目的，下面是原型模式的UML圖。

代碼如下：

#ifndef __WORKEXPERIENCE_H
#define __WORKEXPERIENCE_H
#include <string.h>

class WorkExperience
{
public:
    char m_szWorkDate[256];
    char m_szWorkCompany[256];
public:
    WorkExperience()
    {
        memset(m_szWorkDate, 0, 256);
        memset(m_szWorkCompany, 0, 256);
    }
    ~WorkExperience() {}

    WorkExperience(const WorkExperience& we)
    {
        memcpy(m_szWorkDate, we.m_szWorkDate, 256);
        memcpy(m_szWorkCompany, we.m_szWorkCompany, 256);
    }

    WorkExperience& operator=(const WorkExperience& other)
    {
        if (this == &other )
            return *this;
        memcpy(m_szWorkDate, other.m_szWorkDate, 256);
        memcpy(m_szWorkCompany, other.m_szWorkCompany, 256);
        return *this;
    }
};
#endif // !__WORKEXPERIENCE_H

#ifndef __RESUME_H
#define __RESUME_H

#include "WorkExperience.h"
#include "stdio.h"
class Resume
{
private:
    WorkExperience we;
    char m_szName[256];
    char m_szSex[256];
    char m_szAge[256];
public:
    Resume(char* name)
    {
        InitResume();
        if (NULL == name)
        {
            memcpy(m_szName, "Default", 256);
            return;
        }

        memcpy(m_szName, name, 256);
    }
    ~Resume() {}
    Resume(const Resume& other)
    {
        InitResume();
        memcpy(m_szName, other.m_szName, 256);
        memcpy(m_szSex,  other.m_szSex, 256);
        memcpy(m_szAge,  other.m_szAge, 256);
        we = other.we;
    }

    Resume& operator=(const Resume& other)
    {
        if (this == &other)
            return *this;
        memcpy(m_szName, other.m_szName, 256);
        memcpy(m_szSex, other.m_szSex, 256);
        memcpy(m_szAge, other.m_szAge, 256);
        we = other.we;
    }

    void SetPersonalInfo(char* sex, char * age)
    {
        if ( ( NULL == sex)   )
        {
            memcpy(m_szSex, "M", 256);
        }

        if ((NULL == age))
        {
            memcpy(m_szSex, "18", 256);
        }

        memcpy(m_szSex, sex, 256);
        memcpy(m_szAge, age, 256);
    }

    void SetWorkExperience(char* workDate, char* company)
    {
        memcpy(we.m_szWorkDate, workDate, 256);
        memcpy(we.m_szWorkCompany, company, 256);
    }

    void Display()
    {
        printf("%s %s %s \n", m_szName, m_szSex, m_szAge);
        printf("工作經歷:%s %s\n", we.m_szWorkDate, we.m_szWorkCompany);
    }

    void InitResume()
    {
        memset(m_szName, 0, 256);
        memset(m_szSex, 0, 256);
        memset(m_szAge, 0, 256);
    }

};
#endif // !__RESUME_H

//客戶端代碼
#include "Resume.h"
#include <tchar.h>


int _tmain(int argc, TCHAR* argv[])
{
    Resume xResume ("Mr.Wang");
    xResume.SetPersonalInfo("M", "28");
    xResume.SetWorkExperience("1998-2000", "xx公司");

    Resume yResume(xResume);
    yResume.SetWorkExperience("1998-2006", "yy企業");

    Resume zResume(xResume);
    zResume.SetPersonalInfo("M", "24");
    zResume.SetWorkExperience("1998-2003", "zz企業");


    xResume.Display();
    yResume.Display();
    zResume.Display();

}

運行結果：