[C++] Non-Friend Class

Non-Friend Class.cpp

#include<iostream>
#include<cstdlib>
using namespace std;
/* Note: 這裡的CWin隱含著可以自由存取private,protected, public成員。也就是CWin Class本身就隱含著自己是自己的frined.
*
*/
class CWin
{
    private:
    char m_nID_;
    char * m_ptrTitle_;

    public:
    CWin(char nID='D',char * ptrText="Default windows"): m_nID_(nID)
    {
        m_ptrTitle_=new char[50];
        strcpy(m_ptrTitle_, ptrText);
    }
    void set_data(char nID,char * ptrText)
    {
        m_nID_ = nID;
        strcpy(m_ptrTitle_, ptrText);
    }
    void show()
    {
        cout<<"Windows"<< m_nID_<<":"<< m_ptrTitle_<<endl;
    }

    ~CWin()
    {
        delete [] m_ptrTitle_;
    }

    CWin(const CWin &win)
    {
        m_nID_ = win.m_nID_; // Copy ID.
        strcpy(m_ptrTitle_,win.m_ptrTitle_); // Copy title.
    }

    void operator=(CWin &win);
};

void CWin::operator=(CWin &win)
{
    m_nID_ = win.m_nID_; // Copy ID.
    strcpy(m_ptrTitle_,win.m_ptrTitle_); // Copy title.
}

int main(void)
{
    CWin win1('A',"Main windows"),win2;

    win1.show();
    win2.show();

    win1=win2;
    cout<<endl<<"set win1=win2 ....."<<endl;
    win1.show();
    win2.show();

    win1.set_data('B',"Hello windows");
    cout<<endl<<"change win1..."<<endl;
    win1.show();
    win2.show();

    return 0;
}