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

// 1999-05-21 bkoz
// 2000-05-21 Benjamin Kosnik  <bkoz@redhat.com>
// 2001-01-17 Loren J. Rittle  <ljrittle@acm.org>

// Copyright (C) 1999-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// 27.4.2.4 ios_base static members
// @require@ %-*.tst
// @diff@ %-*.tst %-*.txt

#include <cstdio>
#include <sstream>
#include <iostream>
#include <testsuite_hooks.h>

// N.B. Once we have called sync_with_stdio(false), we can never go back.

void test02() 
{
  bool test __attribute__((unused)) = true;
  
  std::stringbuf 	strbuf01;
  std::ios		ios01(&strbuf01);

  // 1: basic invocation
  VERIFY( ios01.sync_with_stdio() );
  VERIFY( ios01.sync_with_stdio(false) ); //returns previous state

  // 2: need to test interleaving of C and C++ io on a file object.
  VERIFY( std::cout.good() );
  VERIFY( !std::cout.sync_with_stdio(0) );
  VERIFY( std::cout.good() );
  VERIFY( !std::cout.sync_with_stdio(0) );
  VERIFY( std::cout.good() );
}

int main(void)
{
  test02();
  return 0;
}