gomp-20050608-branch/libstdc++-v3/testsuite/27_io/basic_ostringstream/rdbuf/wchar_t/2832.cc

   1 // Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free
  16 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17 // USA.
  18
  19 // 27.7.3.2 member functions (ostringstream_members)
  20
  21 #include <sstream>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 redirect_buffer(std::wios& stream, std::wstreambuf* new_buf)
  26 { stream.rdbuf(new_buf); }
  27
  28 std::wstreambuf*
  29 active_buffer(std::wios& stream)
  30 { return stream.rdbuf(); }
  31
  32 // libstdc++/2832
  33 void test02()
  34 {
  35   bool test __attribute__((unused)) = true;
  36   const wchar_t* strlit01 = L"fuck war";
  37   const std::wstring str00;
  38   const std::wstring str01(strlit01);
  39   std::wstring str02;
  40   std::wstringbuf sbuf(str01);
  41   std::wstreambuf* pbasebuf0 = &sbuf;
  42
  43   std::wostringstream sstrm1;
  44   VERIFY( sstrm1.str() == str00 );
  45   // derived rdbuf() always returns original streambuf, even though
  46   // it's no longer associated with the stream.
  47   std::wstringbuf* const buf1 = sstrm1.rdbuf();
  48   // base rdbuf() returns the currently associated streambuf
  49   std::wstreambuf* pbasebuf1 = active_buffer(sstrm1);
  50   redirect_buffer(sstrm1, &sbuf);
  51   std::wstringbuf* const buf2 = sstrm1.rdbuf();
  52   std::wstreambuf* pbasebuf2 = active_buffer(sstrm1);
  53   VERIFY( buf1 == buf2 );
  54   VERIFY( pbasebuf1 != pbasebuf2 );
  55   VERIFY( pbasebuf2 == pbasebuf0 );
  56
  57   // derived rdbuf() returns the original buf, so str() doesn't change.
  58   VERIFY( sstrm1.str() != str01 );
  59   VERIFY( sstrm1.str() == str00 );
  60   // however, casting the active streambuf to a stringbuf shows what's up:
  61   std::wstringbuf* psbuf = dynamic_cast<std::wstringbuf*>(pbasebuf2);
  62   str02 = psbuf->str();
  63   VERIFY( str02 == str01 );
  64
  65   // How confusing and non-intuitive is this?
  66   // These semantics are a joke, a serious defect, and incredibly lame.
  67 }
  68
  69 int main()
  70 {
  71   test02();
  72   return 0;
  73 }