C++中this指针

#include<iostream>
#include<string>

using namespace std;

class Person{
public:
    Person(const std::string &name, const std::string &address)
    {
        //前面的name表示私有成员的，而后面的name表示传入的参数
        this->name = name;
        this->address = address;
    }

    std::string getName() const
    {
        return  this->name;
        //this指向的是当前对象的name
    }

    std::string getAddress() const
    {
        return  this->address;
    }
private:
    std::string name;
    std::string address;
};

class Screen
{
public:
    typedef std::string::size_type index;
    Screen(index ht = 0, index wd = 0) :contents(ht*wd, 'a'), cursor(0), height(ht), width(wd)
    {

    }
    char get() const
    {
        return contents[cursor];
    }
    char get(index r, index c) const
    {
        index row = r*width;
        return contents[row + c];
    }
    //移动光标
    Screen& move(index r, index c);
    Screen& set(index, index, char);
    Screen& set(char);
    void display(std::ostream &os) const
    {
        do_display(os);
    }
private:
    std::string contents;
    index cursor;
    index height, width;

    void do_display(std::ostream &os) const
    {
        os << contents;
    }
};

Screen& Screen::set(index r, index c, char ch)
{
    index row = r*width;
    contents[row + c] = ch;
    return *this;
}

Screen& Screen::set(char c)
{
    contents[cursor] = c;
    return *this;
}

Screen& Screen::move(index r, index c)
{
    index row = r*width;
    cursor = row + c;
    return *this;
}

int main()
{
    Person p("zhangfei", "garden_5");
    Person p2("liubei", "garden_6");

    cout << p.getName() << endl;
    cout << p2.getName() << endl;

    Screen myScreen(5, 3);
    cout << myScreen.get() << endl;
    myScreen.set(3, 2, 'B');
    cout << myScreen.get(3, 2) << endl;
    //myScreen.move(2, 3);
    //myScreen.set('C');
    //使用下面的语句必须move函数要返回一个对象，则在上面的Screen中设置为类的引用并使用this指针return，且这里的this是必须写的
    myScreen.move(2, 3).set('C');
    myScreen.move(4, 0).set('X').move(4, 1).set('Y').move(4, 2).set('Z');
    cout << myScreen.get() << endl;
    myScreen.display(cout);
    cout << endl;
    return 0;

}

zhangfei
liubei
a
B
Z
aaaaaaaaaCaBXYZ