Re: c++/9122: qualified name forced to be used in non-public derived class

[Neil Booth <neil at daikokuya dot co dot uk>]

ZhenYu Hou wrote:-

> Sorry to bother you.

No problem.

> But I still believe c++/9122 is a bug as the "p" in 
> class "C" is not an access to the base of "C", but a newly defined pointer. 
> Please see below:
> 
> class A {};
> class B : A {
> A* pp; // not full qualified, OK!
> };
> class C : public B {
> public:
>  C(A*);// compiler : `class A' is inaccessible
>  void f(A*) {} compiler : `class A' is inaccessible
>  A* p; // compiler : `class A' is inaccessible
>  ::A* p2; // full qualified, OK!
> };
> 
> I compiled the code with gcc2.95.3, VC7, BC5.5.1, all passed. And I looked 
> up the C++ standard but have not found anything that forbid the sample code 
> to compile.

That just shows you that many compilers can be wrong.

> Another point is if "A" in the sample was replace by "::A", all passed, it 
> seems strange.

11.2p1 and 11.2p4 imply that A is accessible from B, but not from C.
Hence the results you observe.

Name lookup always gives the base class A in either case according to
3.4.1p7.

Neil.