text: // 2004-02-14  Petur Runolfsson  <peturr02@ru.is>
  
  // Copyright (C) 2004 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 2, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING.  If not, write to the Free
  // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  // USA.
  
  // 27.8.1.4 Overridden virtual functions
  
  #include <fstream>
  #include <locale>
  
  class Cvt : public std::codecvt<wchar_t, char, std::mbstate_t>
  {
  protected:
    virtual std::codecvt_base::result
    do_out(std::mbstate_t&, const wchar_t* from, const wchar_t*,
  	 const wchar_t*& from_next, char* to, char*,
  	 char*& to_next) const
    {
      from_next = from;
      to_next = to;
      return std::codecvt_base::error;
    }
    
    virtual bool
    do_always_noconv() const throw()
    { return false; }
  };
  
  // libstdc++/13858
  void test01()
  {
    using namespace std;
    
    wfilebuf fb;
    fb.pubimbue(locale(locale::classic(), new Cvt));
    fb.open("tmp_13858_wchar_t", ios_base::out);
    
    try
      {
        fb.sputc(L'a');
        fb.sputc(L'b');
        fb.pubimbue(locale::classic());
        fb.sputc(L'c');
        fb.pubsync();
        fb.close();
      }
    catch (std::exception&)
      {
      }
  }
  
  int main()
  {
    test01();
    return 0;
  }
  