libstdc++-v3/testsuite/27_io/basic_istream/tellg/char/8348.cc

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000-2018 Free Software Foundation, Inc.
   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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.6.1.3 unformatted input functions
  21 // NB: ostream has a particular "seeks" category. Adopt this for istreams too.
  22
  23 #include <istream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 // libstdc++/8348
  28 void test06(void)
  29 {
  30   using namespace std;
  31   string num1("555");
  32
  33   // tellg
  34   {
  35     istringstream iss(num1);
  36     iss.tellg();
  37     int asNum = 0;
  38     iss >> asNum;
  39     VERIFY( iss.eof() );
  40     VERIFY( !iss.fail() );
  41     iss.clear();
  42     iss.tellg();
  43     VERIFY( !iss.fail() );
  44   }
  45
  46   // seekg
  47   {
  48     istringstream iss(num1);
  49     iss.tellg();
  50     int asNum = 0;
  51     iss >> asNum;
  52     VERIFY( iss.eof() );
  53     VERIFY( !iss.fail() );
  54     iss.seekg(0, ios_base::beg);
  55     VERIFY( !iss.fail() );
  56   }
  57
  58   // seekg
  59   {
  60     istringstream iss(num1);
  61     istream::pos_type pos1 = iss.tellg();
  62     int asNum = 0;
  63     iss >> asNum;
  64     VERIFY( iss.eof() );
  65     VERIFY( !iss.fail() );
  66     iss.seekg(pos1);
  67     VERIFY( !iss.fail() );
  68   }
  69 }
  70
  71 int main()
  72 {
  73   test06();
  74   return 0;
  75 }