libstdc++-v3/testsuite/27_io/ios_base/sync_with_stdio/2.cc

   1 // 1999-05-21 bkoz
   2 // 2000-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   3 // 2001-01-17 Loren J. Rittle  <ljrittle@acm.org>
   4
   5 // Copyright (C) 1999-2013 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 // 27.4.2.4 ios_base static members
  23 // @require@ %-*.tst
  24 // @diff@ %-*.tst %-*.txt
  25
  26 #include <cstdio>
  27 #include <sstream>
  28 #include <iostream>
  29 #include <testsuite_hooks.h>
  30
  31 // N.B. Once we have called sync_with_stdio(false), we can never go back.
  32
  33 void test02()
  34 {
  35   bool test __attribute__((unused)) = true;
  36
  37   std::stringbuf        strbuf01;
  38   std::ios              ios01(&strbuf01);
  39
  40   // 1: basic invocation
  41   VERIFY( ios01.sync_with_stdio() );
  42   VERIFY( ios01.sync_with_stdio(false) ); //returns previous state
  43
  44   // 2: need to test interleaving of C and C++ io on a file object.
  45   VERIFY( std::cout.good() );
  46   VERIFY( !std::cout.sync_with_stdio(0) );
  47   VERIFY( std::cout.good() );
  48   VERIFY( !std::cout.sync_with_stdio(0) );
  49   VERIFY( std::cout.good() );
  50 }
  51
  52 int main(void)
  53 {
  54   test02();
  55   return 0;
  56 }