libstdc++-v3/testsuite/27_io/basic_ostream/sentry/char/2.cc

   1 // 2003-02-06  Paolo Carlini  <pcarlini@unitus.it>
   2
   3 // Copyright (C) 2003 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 // 27.6.2.3 class basic_ostream::sentry
  31
  32 #include <ostream>
  33 #include <sstream>
  34 #include <testsuite_hooks.h>
  35
  36 // libstdc++/9563
  37 struct buf: std::streambuf
  38 {
  39   std::ios *io_;
  40
  41   buf (std::ios *io): io_ (io) { }
  42
  43   virtual int sync ()
  44   {
  45     io_->setstate (std::ios::failbit);
  46     return 0;
  47   }
  48 };
  49
  50 void
  51 test02()
  52 {
  53   bool test = true;
  54
  55   buf b(0);
  56   std::ostream strm(&b);
  57
  58   buf tb(&strm);
  59   std::ostream tied(&tb);
  60
  61   strm.tie(&tied);
  62   std::ostream::sentry s(strm);
  63
  64   VERIFY( !s );
  65 }
  66
  67 int main()
  68 {
  69   test02();
  70   return 0;
  71 }