old-autovect-branch/libstdc++-v3/testsuite/27_io/basic_ifstream/rdbuf/char/2832.cc

   1 // Copyright (C) 2000, 2001, 2003 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 // 27.8.1.7 ifstream member functions
  20 // @require@ %-*.tst %-*.txt
  21 // @diff@ %-*.tst %-*.txt
  22
  23 #include <istream>
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26
  27 const char name_01[] = "ifstream_members-1.tst";
  28 const char name_02[] = "ifstream_members-1.txt";
  29
  30 void
  31 redirect_buffer(std::ios& stream, std::streambuf* new_buf)
  32 { stream.rdbuf(new_buf); }
  33
  34 std::streambuf*
  35 active_buffer(std::ios& stream)
  36 { return stream.rdbuf(); }
  37
  38 // libstdc++/2832
  39 void test03()
  40 {
  41   bool test __attribute__((unused)) = true;
  42   const char* strlit01 = "fuck war";
  43   const std::string str00;
  44   const std::string str01(strlit01);
  45   std::string str02;
  46   std::filebuf fbuf;
  47   std::streambuf* pbasebuf0 = &fbuf;
  48
  49   std::ifstream sstrm1;
  50   // derived rdbuf() always returns original streambuf, even though
  51   // it's no longer associated with the stream.
  52   std::filebuf* const buf1 = sstrm1.rdbuf();
  53   // base rdbuf() returns the currently associated streambuf
  54   std::streambuf* pbasebuf1 = active_buffer(sstrm1);
  55   redirect_buffer(sstrm1, &fbuf);
  56   std::filebuf* const buf2 = sstrm1.rdbuf();
  57   std::streambuf* pbasebuf2 = active_buffer(sstrm1);
  58   VERIFY( buf1 == buf2 );
  59   VERIFY( pbasebuf1 != pbasebuf2 );
  60   VERIFY( pbasebuf2 == pbasebuf0 );
  61
  62   // How confusing and non-intuitive is this?
  63   // These semantics are a joke, a serious defect, and incredibly lame.
  64 }
  65
  66 int main()
  67 {
  68   test03();
  69   return 0;
  70 }
  71
  72
  73