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

   1 // 2003-02-06  Paolo Carlini  <pcarlini@unitus.it>
   2
   3 // Copyright (C) 2003-2019 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 // 27.6.2.3 class basic_ostream::sentry
  22
  23 #include <ostream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 // libstdc++/9563
  28 struct buf : std::streambuf
  29 {
  30   std::ios *io_;
  31
  32   buf(std::ios *io)
  33   : io_(io) { }
  34
  35   virtual int
  36   sync()
  37   {
  38     io_->setstate (std::ios::failbit);
  39     return 0;
  40   }
  41 };
  42
  43 void
  44 test02()
  45 {
  46   buf b(0);
  47   std::ostream strm(&b);
  48
  49   buf tb(&strm);
  50   std::ostream tied(&tb);
  51
  52   strm.tie(&tied);
  53   std::ostream::sentry s(strm);
  54
  55   VERIFY( !s );
  56 }
  57
  58 int main()
  59 {
  60   test02();
  61   return 0;
  62 }