old-autovect-branch/libstdc++-v3/testsuite/27_io/objects/char/5.cc

   1 // 2003-04-26 Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003, 2004 Free Software Foundation
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 27.3 Standard iostream objects
  22
  23 // Check that standard streams can be used from constructors and
  24 // destructors of static objects, provided that an instance of
  25 // ios_base::Init has been constructed.
  26
  27 void init_standard_streams();
  28 int use_standard_streams();
  29
  30 struct Strange
  31 {
  32   int i;
  33
  34   Strange()
  35   {
  36     init_standard_streams();
  37     i = use_standard_streams();
  38   }
  39
  40   ~Strange()
  41   {
  42     use_standard_streams();
  43     init_standard_streams();
  44   }
  45 };
  46
  47 static Strange static_ob;
  48
  49 #include <testsuite_hooks.h>
  50 #include <iostream>
  51
  52 void init_standard_streams()
  53 {
  54   std::ios_base::Init init;
  55 }
  56
  57 int use_standard_streams()
  58 {
  59   std::cout << "Hello, world!" << std::endl;
  60   std::cerr << "World, hello!" << std::endl;
  61
  62   int ret = std::ios_base::xalloc();
  63   std::cin.iword(ret) = ret + 1;
  64   std::cout.iword(ret) = ret + 2;
  65   std::cerr.iword(ret) = ret + 3;
  66   std::clog.iword(ret) = ret + 4;
  67   return ret;
  68 }
  69
  70 void test05()
  71 {
  72   bool test __attribute__((unused)) = true;
  73   int i = static_ob.i;
  74
  75   VERIFY( std::cin.iword(i) == i + 1 );
  76   VERIFY( std::cout.iword(i) == i + 2 );
  77   VERIFY( std::cerr.iword(i) == i + 3 );
  78   VERIFY( std::clog.iword(i) == i + 4 );
  79 }
  80
  81 int main()
  82 {
  83   test05();
  84   return 0;
  85 }