[Bug c++/28332] New: friend classes require explicit qualification when in twin nested namespaces

[genixpro at gmail dot com]

I do not have a copy of the C++ standard, so I am not sure if this is required
behaviour. However, I do know that G++ gives out a somewhat confusing error
that could be changed. My test case follows all of the other required
information.

The trouble is that G++ doesn't give me an error when I declare class B to be a
friend of class A, instead, it just ignores the declaration altogether unless i
explicitly qualify B to be foo::B, in which case it works.

**G++ version info**
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre
--with-cpu=generic --host=i386-redhat-linux
Thread model: posix


**Command line**
g++ testcase.cpp


**Errors**
[bradley@localhost ~]$ g++ testcase.cpp
testcase.cpp: In member function ‘void foo::B::do_another(foo::bar::A&)’:
testcase.cpp:20: error: ‘virtual void foo::bar::A::do_something()’ is protected
testcase.cpp:36: error: within this context


**Preproccessed Testcase from -save-temps**
# 1 "testcase.cpp"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "testcase.cpp"

namespace foo
{
 namespace bar
 {
  class A;
 };
 class B;
};

namespace foo
{
 namespace bar
 {
  class A
  {
  public:
   friend class B;
  protected:
   virtual void do_something()=0;
  };
 };

 class B
 {
 public:
  void do_another(bar::A& a);
 };
};

using namespace foo;
using namespace foo::bar;

void B::do_another(A& a)
{
 a.do_something();
}

void A::do_something()
{

}

int main ( int argc, char *argv[] )
{

}


-- 
           Summary: friend classes require explicit qualification when in
                    twin nested namespaces
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: genixpro at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28332