用于代码注入的c ++代理包装器

Question

是否有任何非侵入性的方式来报告调用哪个客户端函数。 我不想更改客户端代码。如果我可以在调用end时保持y-＆gt; hello1（）语法，那么某些代码注入是可以的。

由于 ABHI

struct client{ 
    void hello1() {cout <<"hi 1";}
    void hello2() {cout <<"hi 2";} 
    };

struct proxy {
    client *target;
    client *operator->() const
        { return target; }
};


void f() {
    client x ;
    proxy y = { & x };

    std::cout <<y->hello1(); //would like proxy to print "hell01 is called
    std::cout <<y->hello2(); //would like proxy to print "hell02 is called
}