The compiler I use (egcs-2.91.60), when compiling the following
short program, diagnoses an access violation, and I'm wondering
if my understanding of using declarations is wrong, or whether
the compiler is incorrect.

I realize that the using declaration is useless here, but the
actual problem came up in a library I didn't write, and is
somewhat more complicated.

Does the using declaration actually make the inherited protected
member unavailable to the derived class?  When it's commented out
the program compiles cleanly.


$ cat t.cpp

struct S_base  {  protected:  int x;  };

struct S : private S_base
{
  int const* get( ) const {  return &( this->x ); }
 private:
  using S_base::x;    // <---------------------------------------
};

int const* s_get( S const& s ) {  return s.get( );  }

int main( )
 {
   S s;
   s_get( s );
 }
$ g++ --ansi --pedantic -Wall t.cpp
t.cpp: In method `const int * S::get() const':
t.cpp:6: member `x' declared private
t.cpp:6: warning: control reaches end of non-void function `S::get()
const'
$
---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]