C++官方文档-this

#include <iostream>

using namespace std;

class Dummy

{

public:

    int x;

    Dummy()

            : x()

    {

    }

    ;

    Dummy(int xx)

            : x(xx)

    {

    }

    ;

    bool isitem(Dummy const&);

    Dummy& operator=(Dummy const& param);

};

bool Dummy::isitem(Dummy const& param)

{

    if(this == &param)

        return true;

    return false;

}

Dummy& Dummy::operator=(const Dummy& param)

{

    this->x = param.x;

    cout << "=" << endl;

    //this指向等号左边的对象

    return *this;

}

int main()

{

    Dummy a;

    Dummy* b = &a;

    if(b->isitem(a))

        cout << true << endl;

    else

        cout << false << endl;

    Dummy foo();

    Dummy bar;

    //声明一个对象,然后把foo赋值给它

//    Dummy bar=foo;

    //调用重载函数=

//    bar.operator =(foo);

    //调用重载函数=

    bar = foo;

    cout << bar.x << endl;

    cout << bar.isitem(foo) << endl;

    cout << bar.isitem(bar) << endl;

    return ;

}