指向成员的选择

Question

我在书pp 191上列出了以下二元运算符，

Point-to-member selection  x->*y

我理解x->y但不理解x->*y。这是拼写错误还是别的什么？

Answer 1

InformIT: C++ Reference Guide > Pointers to Members

---

y是指向*x类型内的成员类型的指针，请参阅下面的示例。

struct Obj { int m; };

...

 Obj        o;  
 Obj *      p = &o; 

 int Obj::* y = &Obj::m;

 // 'y' can point to any int inside Obj, currently it's pointing at Obj::m
 // do notice that it's not bound to any specific instance of Obj

 o.m = 10; 

 std::cout << (p->* y) << std::endl; 
 std::cout << (o .* y) << std::endl; 

输出

10
10

Answer 2

别的。请参阅此处的C ++ FAQ：

http://www.parashift.com/c++-faq-lite/pointers-to-members.html