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

   1 // 2003-09-22  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003-2022 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 // 27.6.2.6 Unformatted output functions
  21 //
  22 // _GLIBCXX_RESOLVE_LIB_DEFECTS
  23 // DR 60. What is a formatted input function?
  24 // basic_ostream::flush() does not behave as an unformatted output function.
  25 // But wait  ...
  26 // 581. flush() not unformatted function
  27 // So now basic_ostream::flush() *is* an unformatted output function.
  28
  29 #include <ostream>
  30 #include <testsuite_hooks.h>
  31 #include <testsuite_io.h>
  32
  33 void
  34 test01()
  35 {
  36   std::ostream os(0);
  37   VERIFY( os.bad() );
  38
  39   // Nothing should happen if os.rdbuf() is null. No sentry is constructed.
  40   os.flush();
  41   VERIFY( os.rdstate() == std::ios_base::badbit ); // no failbit
  42
  43   os.exceptions(std::ios_base::failbit);
  44   os.flush();
  45 }
  46
  47 void test02()
  48 {
  49   __gnu_test::sync_streambuf buf;
  50   std::ostream os(&buf);
  51
  52   __gnu_test::sync_streambuf buf_tie;
  53   std::ostream os_tie(&buf_tie);
  54
  55   // A sentry should be constructed so os.tie()->flush() should be called.
  56   os.tie(&os_tie);
  57
  58   os.flush();
  59
  60   VERIFY( os.good() );
  61   VERIFY( buf.sync_called() );
  62   VERIFY( buf_tie.sync_called() );
  63 }
  64
  65 void
  66 test03()
  67 {
  68   __gnu_test::sync_streambuf buf;
  69   std::ostream os(&buf);
  70
  71   __gnu_test::sync_streambuf buf_tie;
  72   std::ostream os_tie(&buf_tie);
  73
  74   os.tie(&os_tie);
  75
  76   // os.rdbuf()->pubsync() should not be called if !os.good().
  77   os.setstate(std::ios_base::eofbit);
  78
  79   os.flush();
  80
  81   VERIFY( os.rdstate() & std::ios_base::eofbit );
  82   VERIFY( !buf.sync_called() );
  83   VERIFY( !buf_tie.sync_called() );
  84 }
  85
  86 int main()
  87 {
  88   test01();
  89   test02();
  90   test03();
  91 }