libstdc++-v3/testsuite/27_io/ofstream_members.cc

   1 // Copyright (C) 2000, 2001 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // 27.8.1.10 ofstream member functions
  20 // @require@ %-*.tst
  21 // @diff@ %-*.tst %-*.txt
  22
  23 #include <ostream>
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26
  27 const char name_01[] = "ofstream_members-1.tst";
  28 const char name_02[] = "ofstream_members-1.txt";
  29
  30 // http://gcc.gnu.org/ml/libstdc++/2000-06/msg00136.html
  31 bool test00()
  32 {
  33   bool test = true;
  34   std::ofstream ofs1;
  35   ofs1.close();
  36
  37   // false as expected:
  38   VERIFY( !ofs1.is_open() );
  39    // this is now true:
  40   VERIFY( !(ofs1) );
  41
  42   ofs1.open(name_02);
  43   VERIFY( ofs1.is_open() );
  44   // fail bit still true
  45   VERIFY( !(ofs1) );
  46   VERIFY( ofs1.rdstate() == std::ios_base::failbit );
  47
  48   ofs1.close();
  49
  50 #ifdef DEBUG_ASSERT
  51   assert(test);
  52 #endif
  53
  54   return test;
  55 }
  56
  57
  58 // http://gcc.gnu.org/ml/libstdc++/2000-07/msg00004.html
  59 bool test01()
  60 {
  61   bool test = true;
  62   const int more_than_max_open_files = 8200;
  63
  64   for(int i = 0; ++i < more_than_max_open_files;)
  65     {
  66       std::ofstream ifs(name_02);
  67       VERIFY( static_cast<bool>(ifs) );
  68     }
  69
  70 #ifdef DEBUG_ASSERT
  71   assert(test);
  72 #endif
  73
  74   return test;
  75 }
  76
  77 void
  78 redirect_buffer(std::ios& stream, std::streambuf* new_buf)
  79 { stream.rdbuf(new_buf); }
  80
  81 std::streambuf*
  82 active_buffer(std::ios& stream)
  83 { return stream.rdbuf(); }
  84
  85 // libstdc++/2832
  86 void test02()
  87 {
  88   bool test = true;
  89   const char* strlit01 = "fuck war";
  90   const char* strlit02 = "two less cars abstract riot crew, critical mass/SF";
  91   const std::string str00;
  92   const std::string str01(strlit01);
  93   std::string str02;
  94   std::filebuf fbuf;
  95   std::streambuf* pbasebuf0 = &fbuf;
  96
  97   std::ofstream sstrm1;
  98   // derived rdbuf() always returns original streambuf, even though
  99   // it's no longer associated with the stream.
 100   std::filebuf* const buf1 = sstrm1.rdbuf();
 101   // base rdbuf() returns the currently associated streambuf
 102   std::streambuf* pbasebuf1 = active_buffer(sstrm1);
 103   redirect_buffer(sstrm1, &fbuf);
 104   std::filebuf* const buf2 = sstrm1.rdbuf();
 105   std::streambuf* pbasebuf2 = active_buffer(sstrm1);
 106   VERIFY( buf1 == buf2 );
 107   VERIFY( pbasebuf1 != pbasebuf2 );
 108   VERIFY( pbasebuf2 == pbasebuf0 );
 109
 110   // How confusing and non-intuitive is this?
 111   // These semantics are a joke, a serious defect, and incredibly lame.
 112 }
 113
 114 int main()
 115 {
 116   test00();
 117   test01();
 118
 119   test02();
 120   return 0;
 121 }
 122
 123
 124