| // 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. |
| |
| // 27.7.3.2 member functions (ostringstream_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::wostringstream 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; |
| } |