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

   1 // Copyright (C) 2005-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18
  19 // 27.6.2.3 class basic_ostream::sentry
  20
  21 #include <ostream>
  22 #include <sstream>
  23 #include <testsuite_hooks.h>
  24
  25 // libstdc++/9563
  26 struct buf : std::wstreambuf
  27 {
  28   std::wios *io_;
  29
  30   buf(std::wios *io)
  31   : io_(io) { }
  32
  33   virtual int
  34   sync()
  35   {
  36     io_->setstate (std::wios::failbit);
  37     return 0;
  38   }
  39 };
  40
  41 void
  42 test02()
  43 {
  44   buf b(0);
  45   std::wostream strm(&b);
  46
  47   buf tb(&strm);
  48   std::wostream tied(&tb);
  49
  50   strm.tie(&tied);
  51   std::wostream::sentry s(strm);
  52
  53   VERIFY( !s );
  54 }
  55
  56 int main()
  57 {
  58   test02();
  59   return 0;
  60 }