指针重载的疑惑，c++ bug？
#include <string>
#include <iostream>
using namespace std;

class Token
{
public:
Token()
{}
const string& s_text()
{
cout < < "ok! " < < endl;
return text;
}
string text;
};


class Pointer
{
public:
Pointer(){sn=0;}
typedef Token* pointer_type;
pointer_type operator -> () const
{
cout < < "pointer value= " < < (int) sn < < endl;
return ( pointer_type )sn;//sn==0
}
Token* sn;
};


int main()
{
Pointer pp;
pp-> s_text();//为什么 sn==0 却仍可以调用s_text()不报错
return 0;
}
程序输出
pointer value=0
ok！

[解决办法]
看这个帖子, 说得很清楚了!
http://community.csdn.net/Expert/topic/5526/5526033.xml?temp=.2860224