libstdc++-v3/testsuite/27_io/basic_filebuf/close/char/1.cc

   1 // Copyright (C) 2001, 2002, 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // 27.8.1.3 filebuf member functions
  20 // @require@ %-*.tst %-*.txt
  21 // @diff@ %-*.tst %-*.txt
  22
  23 // various tests for filebuf::open() and filebuf::close() including
  24 // the non-portable functionality in the libstdc++-v3 IO library
  25
  26 #include <fstream>
  27 #include <testsuite_hooks.h>
  28
  29 const char name_01[] = "filebuf_members-1.tst";
  30 const char name_02[] = "filebuf_members-1.txt";
  31
  32 // Test member functions.
  33 void test_01()
  34 {
  35   bool test __attribute__((unused)) = true;
  36   const char* name_03 = "filebuf_members-3"; // empty file, need to create
  37
  38   std::filebuf fb_01; // in
  39   std::filebuf fb_02; // out
  40   std::filebuf fb_03; // in | out
  41
  42   // bool is_open()
  43   VERIFY( !fb_01.is_open() );
  44   VERIFY( !fb_02.is_open() );
  45   VERIFY( !fb_03.is_open() );
  46
  47   // filebuf_type* open(const char* __s, ios_base::openmode __mode)
  48   fb_01.open(name_01, std::ios_base::in | std::ios_base::ate);
  49   VERIFY( fb_01.is_open() );
  50
  51   // Try to open two different files without closing the first:
  52   // Should keep the old file attached, and disregard attempt to overthrow.
  53   fb_02.open(name_02, std::ios_base::in | std::ios_base::out
  54              | std::ios_base::trunc);
  55   VERIFY( fb_02.is_open() );
  56
  57   fb_03.open(name_03, std::ios_base::out | std::ios_base::trunc);
  58   VERIFY( fb_03.is_open() );
  59
  60   // filebuf_type* close()
  61   std::filebuf* f;
  62   f = fb_01.close();
  63   VERIFY( f != NULL );
  64   VERIFY( !fb_01.is_open() );
  65
  66   f = fb_02.close();
  67   VERIFY( f != NULL );
  68   VERIFY( !fb_02.is_open() );
  69
  70   f = fb_03.close();
  71   VERIFY( f != NULL );
  72   VERIFY( !fb_03.is_open() );
  73
  74   f = fb_03.close();
  75   VERIFY( f == NULL );
  76   VERIFY( !fb_03.is_open() );
  77 }
  78
  79 int
  80 main()
  81 {
  82   test_01();
  83   return 0;
  84 }
  85
  86