[cfe-dev] Accessing private members through typedefs

John McCall rjmccall at apple.com
Fri Apr 30 19:17:27 PDT 2010

On Apr 30, 2010, at 6:49 PM, John Thompson wrote:

> I have the following:
> template <class TYPE> class test;
> typedef test<int> testClass;
> typedef testClass& refTestClass;
> template <typename TYPE> class test
> {
> public:
>  test(refTestClass other);
> private:
>  int member;
> };
> template <typename TYPE>
> inline test<TYPE>::test(refTestClass other) {
>  member = other.member;
> }
> C:\Sony\Clang\exp>clang -cc1 priv.cpp
> priv.cpp:15:17: error: 'member' is a private member of 'test<int>'
>         member = other.member;
>                        ^
> priv.cpp:10:6: note: declared private here
>         int member;
> Is this a bug or legitimate behavior?

It's a bug.  There is one valid instantiation of this template, at TYPE=int, so we can't diagnose.

The bug has nothing to do with typedefs.  Reduction:

template <class T> class A {
  int foo;
  int getFoo(A<int> &a) {
    return a.foo;

> Sorry to bug you with these.  Basically I'm running Clang over a very large program written by someone else and compiled with gcc.  Is this the appropriate place for this, or should I just file bugs and let someone else respond as needed?

Bugs are probably more appropriate.  Please file this one.


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