c++中this关键字

#include <iostream>using namespace std;class Dummy {public:    bool isitme (Dummy& param) ;};bool Dummy::isitme (Dummy& param) {    if (&param == this)    {        return true;    } else {        return false;    }}int main(int argc, char const *argv[]){    Dummy a;    Dummy *b = &a;    if (b -> isitme(a))    {        cout << "yes, &a is b\n";    }    return 0;}