libstdc++-v3/testsuite/25_algorithms/advance/istreambuf_iterators/char/2.cc

   1 // Copyright (C) 2017-2024 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 // { dg-require-fileio "" }
  19
  20 #include <iterator>
  21 #include <fstream>
  22 #include <algorithm>
  23
  24 #include <testsuite_hooks.h>
  25
  26 void test01()
  27 {
  28   using namespace std;
  29
  30   typedef istreambuf_iterator<char> in_iterator_type;
  31
  32   unsigned found = 0;
  33
  34   {
  35     ifstream fbuf("istream_unformatted-1.txt");
  36
  37     in_iterator_type beg(fbuf);
  38     in_iterator_type end;
  39
  40     for (;;)
  41       {
  42         beg = find(beg, end, '1');
  43         if (beg == end)
  44           break;
  45
  46         ++found;
  47         VERIFY( *beg == '1' );
  48
  49         advance(beg, 9);
  50         VERIFY( *beg == '0' );
  51       }
  52   }
  53
  54   {
  55     ifstream fbuf("istream_unformatted-1.txt");
  56
  57     in_iterator_type beg(fbuf);
  58     in_iterator_type end;
  59
  60     beg = find(beg, end, '1');
  61     VERIFY( beg != end );
  62     VERIFY( *beg == '1' );
  63
  64     advance(beg, 9);
  65     VERIFY( *beg == '0' );
  66
  67     unsigned line_length = 10;
  68     while (*++beg != '1')
  69       ++line_length;
  70
  71     // Try to jump directly to the end through advance.
  72     advance(beg, (found - 2) * line_length + 9);
  73     VERIFY( *beg == '0' );
  74     VERIFY( find(beg, end, '1') == end );
  75   }
  76 }
  77
  78 int main()
  79 {
  80   test01();
  81   return 0;
  82 }