Problem with private methods

Problem with private methods

[Hultman, Sten]

Hi !

I have encountered a problem when turning from aCC to gcc 3.0.3 on
HP-UX11.00.

I enclose a short samle and the error messages.
It works with no problem on aCC.
I can't see why the streambuf methods are private in this context.or anyo 
Greatful for any hint !

Kindest regards
Sten Hultman


THE PROGRAM:

#include <iostream>
using namespace std;

class sockbuf: public streambuf {
public:
                        sockbuf ();
                        sockbuf (const sockbuf&);
  sockbuf&              operator = (const sockbuf&);
  virtual               ~sockbuf ();
};

sockbuf::sockbuf (const sockbuf& sb)
  : streambuf (sb)
{
}

sockbuf& sockbuf::operator = (const sockbuf& sb)
{
  if (this != &sb ) {
    streambuf::operator = (sb);
    this->sockbuf::~sockbuf(); 
  }
  return *this;
}

THE COMPILER MESSAGES:

[49] % g++ -c socktest.C -o socktest.o
/home/jalpman/gnu32/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.0.3/include/g++/bits
/std_streambuf.h: In
   copy constructor `sockbuf::sockbuf(const sockbuf&)':
/home/jalpman/gnu32/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.0.3/include/g++/bits
/std_streambuf.h:517: `std::basic_streambuf<_CharT,
   _Traits>::basic_streambuf(const std::basic_streambuf<_CharT, _Traits>&) 
   [with _CharT = char, _Traits = std::char_traits<char>]' is private
socktest.C:17: within this context
/home/jalpman/gnu32/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.0.3/include/g++/bits
/std_streambuf.h: In
   member function `sockbuf& sockbuf::operator=(const sockbuf&)':
/home/jalpman/gnu32/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.0.3/include/g++/bits
/std_streambuf.h:520: `std::basic_streambuf<_CharT,
   _Traits>& std::basic_streambuf<_CharT, _Traits>::operator=(const 
   std::basic_streambuf<_CharT, _Traits>&) [with _CharT = char, _Traits = 
   std::char_traits<char>]' is private
socktest.C:24: within this context


COMPARISON WITH aCC:

] % 
[55] % aCC  -c -AA -O -D__hpux__  -I. -I/opt/aCC/include_std  socktest.C -o
socktest.o
[56] % 








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Re: Problem with private methods

[Reichelt]

Hello!

> I have encountered a problem when turning from aCC to gcc 3.0.3 on
> HP-UX11.00.
>
> I enclose a short samle and the error messages.
> It works with no problem on aCC.
> I can't see why the streambuf methods are private in this context.or
> anyo 
> Greatful for any hint !
>
> Kindest regards
> Sten Hultman

It's intentional that the copy-constructor and operator= of streambuf
are private. A look at the streambuf header unveils:

----------------snip here---------------------
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
    // Side effect of DR 50.
    private:
      basic_streambuf(const __streambuf_type&);

      __streambuf_type& 
      operator=(const __streambuf_type&);
#endif
----------------snip here---------------------

The explanation can be found in DR (defect report) 50:
http://gcc.gnu.org/onlinedocs/libstdc++/ext/lwg-defects.html#50

Greetings,
Volker Reichelt