c++/3300: using declaration does not change member accessibility correctly

c++/3300: using declaration does not change member accessibility correctly

[oliver]

>Number:         3300
>Category:       c++
>Synopsis:       using declaration does not change member accessibility correctly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 20 11:46:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     g++
>Release:        3.0
>Organization:
>Environment:
Suse Linux 7.1/ kernel 2.2.18
>Description:
The using-declaration in the example below does not change the accessibility of the foo-members as expected. 
According to the ISO-C++ standard (section 7.3.3/14),
"all instances of the name mentioned in a using-declaration shall be accessible". In the example, g++ grants access only to the const version of foo, not to the  mutable variant and thus complains with
  test.C:19: assignment of read-only location.
Another funny thing: changing the declaration order of the
two foo versions in the base class makes the mutable version available and lets g++ compile the code.
g++ 2.95.3 did not have that kind of trouble.
>How-To-Repeat:
class A
{
        public:

        int& foo() { return x; }
        const int& foo() const { return x; }
        int x;
};

class B : private A
{
        public:
        using A::foo;
};

int main()
{
        B b;
        b.foo() = 5;
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

Re: c++/3300: using declaration does not change member accessibility correctly

[gdr]

Synopsis: using declaration does not change member accessibility correctly

Responsible-Changed-From-To: unassigned->gdr
Responsible-Changed-By: gdr
Responsible-Changed-When: Sat Aug 11 13:38:33 2001
Responsible-Changed-Why:
    Analyzed.
State-Changed-From-To: open->closed
State-Changed-By: gdr
State-Changed-When: Sat Aug 11 13:38:33 2001
State-Changed-Why:
    Confirmes as bug.  Duplicate of 3242.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3300&database=gcc