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// Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// 27.7.2.2 member functions (istringstream_members)

#include <sstream>

#include <testsuite_hooks.h>

void

redirect_buffer(std::wios& stream, std::wstreambuf* new_buf)

{ stream.rdbuf(new_buf); }

std::wstreambuf*

active_buffer(std::wios& stream)

{ return stream.rdbuf(); }

// libstdc++/2832

void test02()

{

  bool test __attribute__((unused)) = true;

  const wchar_t* strlit01 = L"fuck war";

  const std::wstring str00;

  const std::wstring str01(strlit01);

  std::wstring str02;

  std::wstringbuf sbuf(str01);

  std::wstreambuf* pbasebuf0 = &sbuf;

  std::wistringstream sstrm1;

  VERIFY( sstrm1.str() == str00 );

  // derived rdbuf() always returns original streambuf, even though

  // it's no longer associated with the stream.

  std::wstringbuf* const buf1 = sstrm1.rdbuf();

  // base rdbuf() returns the currently associated streambuf

  std::wstreambuf* pbasebuf1 = active_buffer(sstrm1);

  redirect_buffer(sstrm1, &sbuf);

  std::wstringbuf* const buf2 = sstrm1.rdbuf();

  std::wstreambuf* pbasebuf2 = active_buffer(sstrm1);

  VERIFY( buf1 == buf2 );

  VERIFY( pbasebuf1 != pbasebuf2 );

  VERIFY( pbasebuf2 == pbasebuf0 );

  // derived rdbuf() returns the original buf, so str() doesn't change.

  VERIFY( sstrm1.str() != str01 );

  VERIFY( sstrm1.str() == str00 );

  // however, casting the active streambuf to a stringbuf shows what's up:

  std::wstringbuf* psbuf = dynamic_cast<std::wstringbuf*>(pbasebuf2);

  str02 = psbuf->str();

  VERIFY( str02 == str01 );

  // How confusing and non-intuitive is this?

  // These semantics are a joke, a serious defect, and incredibly lame.

}

int main()

{

  test02();

  return 0;

}