[Bug c++/62064] New: Private inheritance and conversion function id in class member access

roger.ferrer at bsc dot es gcc-bugzilla@gcc.gnu.org
Fri Aug 8 15:37:00 GMT 2014


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62064

            Bug ID: 62064
           Summary: Private inheritance and conversion function id in
                    class member access
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roger.ferrer at bsc dot es

Hi,

the snippet below causes an access error in g++ 4.9.1 if the
conversion-function-id is referenced in a class-member access.

Intel C++ 14.0.2 and clang 3.3 accept it.

This problem can be worked around with -fno-access-control

(There is also some weirdness like 'struct A A::A' in the diagnostic messages
themselves, but I guess this would belong to another bug)

Should the code be ill-formed, then the "OK" case should be rejected as well.

// -- test.cc
struct A
{
    typedef int some_type;
    operator some_type();
};

struct  B : private A
{
    typedef bool some_type;
    void foo(B &r)
    {
        B *p;
        B o;

        A::operator A::some_type(); // OK

        o.A::operator A::some_type(); // ERR
        r.A::operator A::some_type(); // ERR
        p->A::operator A::some_type(); // ERR
        (*this).A::operator A::some_type(); // ERR
    }
};
// -- end of test.cc

$ g++ --version
g++ (Debian 4.9.1-1) 4.9.1
$ g++ -c test.cc
test.cc: In member function ‘void B::foo(B&)’:
test.cc:3:1: error: ‘struct A A::A’ is inaccessible
 {
 ^
test.cc:18:23: error: within this context
         o.A::operator A::some_type(); // ERR
                       ^
test.cc:4:17: error: ‘typedef int A::some_type’ is inaccessible
     typedef int some_type;
                 ^
test.cc:18:26: error: within this context
         o.A::operator A::some_type(); // ERR
                          ^
test.cc:3:1: error: ‘struct A A::A’ is inaccessible
 {
 ^
test.cc:19:23: error: within this context
         r.A::operator A::some_type(); // ERR
                       ^
test.cc:4:17: error: ‘typedef int A::some_type’ is inaccessible
     typedef int some_type;
                 ^
test.cc:19:26: error: within this context
         r.A::operator A::some_type(); // ERR
                          ^
test.cc:3:1: error: ‘struct A A::A’ is inaccessible
 {
 ^
test.cc:20:24: error: within this context
         p->A::operator A::some_type(); // ERR
                        ^
test.cc:4:17: error: ‘typedef int A::some_type’ is inaccessible
     typedef int some_type;
                 ^
test.cc:20:27: error: within this context
         p->A::operator A::some_type(); // ERR
                           ^
test.cc:3:1: error: ‘struct A A::A’ is inaccessible
 {
 ^
test.cc:21:29: error: within this context
         (*this).A::operator A::some_type(); // ERR
                             ^
test.cc:4:17: error: ‘typedef int A::some_type’ is inaccessible
     typedef int some_type;
                 ^
test.cc:21:32: error: within this context
         (*this).A::operator A::some_type(); // ERR
                                ^

Kind regards,


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