libstdc++-v3/testsuite/27_io/basic_ofstream/rdbuf/char/2832.cc

   1 // Copyright (C) 2000-2016 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 // 27.8.1.10 ofstream member functions
  19 // @require@ %-*.tst
  20 // @diff@ %-*.tst %-*.txt
  21
  22 #include <ostream>
  23 #include <fstream>
  24 #include <testsuite_hooks.h>
  25
  26 const char name_01[] = "ofstream_members-1.tst";
  27
  28 void
  29 redirect_buffer(std::ios& stream, std::streambuf* new_buf)
  30 { stream.rdbuf(new_buf); }
  31
  32 std::streambuf*
  33 active_buffer(std::ios& stream)
  34 { return stream.rdbuf(); }
  35
  36 // libstdc++/2832
  37 void test03()
  38 {
  39   bool test __attribute__((unused)) = true;
  40   const char* strlit01 = "fuck war";
  41   const std::string str00;
  42   const std::string str01(strlit01);
  43   std::string str02;
  44   std::filebuf fbuf;
  45   std::streambuf* pbasebuf0 = &fbuf;
  46
  47   std::ofstream sstrm1;
  48   // derived rdbuf() always returns original streambuf, even though
  49   // it's no longer associated with the stream.
  50   std::filebuf* const buf1 = sstrm1.rdbuf();
  51   // base rdbuf() returns the currently associated streambuf
  52   std::streambuf* pbasebuf1 = active_buffer(sstrm1);
  53   redirect_buffer(sstrm1, &fbuf);
  54   std::filebuf* const buf2 = sstrm1.rdbuf();
  55   std::streambuf* pbasebuf2 = active_buffer(sstrm1);
  56   VERIFY( buf1 == buf2 );
  57   VERIFY( pbasebuf1 != pbasebuf2 );
  58   VERIFY( pbasebuf2 == pbasebuf0 );
  59
  60   // How confusing and non-intuitive is this?
  61   // These semantics are a joke, a serious defect, and incredibly lame.
  62 }
  63
  64 int main()
  65 {
  66   test03();
  67   return 0;
  68 }
  69
  70
  71