类成员包含一个"引用",编译错误,如何解决?

folklore

1/

void p(){printf("%p,%p\n",&s::f,&s::g);}

it is the same of void p(){printf("%p,%p\n",[red]s::f,s::g[/red]);}
and the tag '&' in here is not means a "reference", but "get the address".

2/
you can do this:
int a;
int& refa=a;

but the following code means nothing:
int a;
int& refa;  // error!! Must  assign a value (but some compiler permit you to do this. i don't know why)
refa=a;     // It is just a assignment statment