1// Copyright (C) 2004-2015 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// 27.7.6 member functions (stringstream_members)
19
20#include <sstream>
21#include <testsuite_hooks.h>
22
23void
24redirect_buffer(std::wios& stream, std::wstreambuf* new_buf)
25{ stream.rdbuf(new_buf); }
26
27std::wstreambuf*
28active_buffer(std::wios& stream)
29{ return stream.rdbuf(); }
30
31// libstdc++/2832
32void test02()
33{
34  bool test __attribute__((unused)) = true;
35  const wchar_t* strlit01 = L"fuck war";
36  const std::wstring str00;
37  const std::wstring str01(strlit01);
38  std::wstring str02;
39  std::wstringbuf sbuf(str01);
40  std::wstreambuf* pbasebuf0 = &sbuf;
41
42  std::wstringstream sstrm1;
43  VERIFY( sstrm1.str() == str00 );
44  // derived rdbuf() always returns original streambuf, even though
45  // it's no longer associated with the stream.
46  std::wstringbuf* const buf1 = sstrm1.rdbuf();
47  // base rdbuf() returns the currently associated streambuf
48  std::wstreambuf* pbasebuf1 = active_buffer(sstrm1);
49  redirect_buffer(sstrm1, &sbuf);
50  std::wstringbuf* const buf2 = sstrm1.rdbuf();
51  std::wstreambuf* pbasebuf2 = active_buffer(sstrm1);
52  VERIFY( buf1 == buf2 );
53  VERIFY( pbasebuf1 != pbasebuf2 );
54  VERIFY( pbasebuf2 == pbasebuf0 );
55
56  // derived rdbuf() returns the original buf, so str() doesn't change.
57  VERIFY( sstrm1.str() != str01 );
58  VERIFY( sstrm1.str() == str00 );
59  // however, casting the active streambuf to a stringbuf shows what's up:
60  std::wstringbuf* psbuf = dynamic_cast<std::wstringbuf*>(pbasebuf2);
61  str02 = psbuf->str();
62  VERIFY( str02 == str01 );
63
64  // How confusing and non-intuitive is this?
65  // These semantics are a joke, a serious defect, and incredibly lame.
66}
67
68int main()
69{
70  test02();
71  return 0;
72}
73