C++官方文档-this

#include <iostream>
using namespace std;

class Dummy
{
public:
    int x;
    Dummy()
            : x(0)
    {
    }
    ;
    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(3);
    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 0;
}