libstdc++-v3/testsuite/24_iterators/istream_iterator/1.cc

   1 // Copyright (C) 2019 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 // C++98 24.5.1 Template class istream_iterator
  19
  20 #include <iterator>
  21 #include <sstream>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_iterators.h>
  24
  25 void test01()
  26 {
  27   using namespace std;
  28
  29   const int N = 6;
  30   int arr[N]  = { };
  31   using __gnu_test::test_container;
  32   using __gnu_test::output_iterator_wrapper;
  33   test_container<int, output_iterator_wrapper> con(arr, arr+N);
  34   output_iterator_wrapper<int> out = con.begin();
  35
  36   istringstream ss("1 2 3 4 5");
  37   std::istream_iterator<int> iter(ss), end;
  38   while (iter != end)
  39     *out++ = *iter++;
  40   VERIFY( iter == end );
  41   for (int i = 0; i < N; ++i)
  42     VERIFY( arr[i] == (i + 1) % N );
  43
  44   std::istream_iterator<int> iter2(ss);
  45   VERIFY( iter2 == end );
  46
  47   ss.clear();
  48   ss.str("-1 -2 -3");
  49   VERIFY( iter == end );
  50
  51 #ifndef _GLIBCXX_DEBUG
  52   // This is undefined, so aborts under debug mode.
  53   // Without debug mode, it should not extract anything from the stream,
  54   // and the iterator should remain at end-of-stream.
  55   ++iter;
  56   VERIFY( iter == end );
  57 #endif
  58
  59   std::istream_iterator<int> iter3(ss);
  60   VERIFY( iter3 != end );
  61   VERIFY( iter3 != iter );
  62   VERIFY( *iter3 == -1 );
  63   ++iter3;
  64   VERIFY( *iter3 == -2 );
  65
  66   iter2 = iter3;
  67   VERIFY( *iter2 == -2 );
  68   ++iter2;
  69   VERIFY( *iter2 == -3 );
  70   ++iter2;
  71   VERIFY( iter2 == end );
  72 }
  73
  74 int main()
  75 {
  76   test01();
  77 }