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

   1 // Copyright (C) 2000 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 // 27.8.1.7 ifstream member functions
  20 // @require@ %-*.tst %-*.txt
  21 // @diff@ %-*.tst %-*.txt
  22
  23 #include <istream>
  24 #include <fstream>
  25 #include <debug_assert.h>
  26
  27 const char name_01[] = "ifstream_members-1.tst";
  28 const char name_02[] = "ifstream_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::ifstream ifs1;
  35   ifs1.close();
  36
  37   // false as expected:
  38   VERIFY( !ifs1.is_open() );
  39    // this is now true:
  40   VERIFY( !(ifs1) );
  41
  42   ifs1.open(name_01);
  43   VERIFY( ifs1.is_open() );
  44   // fail bit still true
  45   VERIFY( !(ifs1) );
  46   VERIFY( ifs1.rdstate() == std::ios_base::failbit );
  47
  48   ifs1.close();
  49
  50 #ifdef DEBUG_ASSERT
  51   assert(test);
  52 #endif
  53
  54   return test;
  55 }
  56
  57 // http://gcc.gnu.org/ml/libstdc++/2000-07/msg00004.html
  58 bool test01()
  59 {
  60   bool test = true;
  61   const int more_than_max_open_files = 8200;
  62
  63   for(int i = 0; ++i < more_than_max_open_files;)
  64     {
  65       std::ifstream ifs(name_01);
  66       VERIFY( static_cast<bool>(ifs) );
  67     }
  68
  69 #ifdef DEBUG_ASSERT
  70   assert(test);
  71 #endif
  72
  73   return test;
  74 }
  75
  76
  77 int main()
  78 {
  79   test00();
  80   test01();
  81   return 0;
  82 }