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

   1 // Copyright (C) 2004-2021 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 // 27.6.1.3 unformatted input functions
  19 // NB: ostream has a particular "seeks" category. Adopt this for istreams too.
  20
  21 #include <istream>
  22 #include <sstream>
  23 #include <testsuite_hooks.h>
  24
  25 // libstdc++/8348
  26 void test06(void)
  27 {
  28   using namespace std;
  29   wstring num1(L"555");
  30
  31   // tellg
  32   {
  33     wistringstream iss(num1);
  34     iss.tellg();
  35     int asNum = 0;
  36     iss >> asNum;
  37     VERIFY( iss.eof() );
  38     VERIFY( !iss.fail() );
  39     iss.clear();
  40     iss.tellg();
  41     VERIFY( !iss.fail() );
  42   }
  43
  44   // seekg
  45   {
  46     wistringstream iss(num1);
  47     iss.tellg();
  48     int asNum = 0;
  49     iss >> asNum;
  50     VERIFY( iss.eof() );
  51     VERIFY( !iss.fail() );
  52     iss.seekg(0, ios_base::beg);
  53     VERIFY( !iss.fail() );
  54   }
  55
  56   // seekg
  57   {
  58     wistringstream iss(num1);
  59     wistream::pos_type pos1 = iss.tellg();
  60     int asNum = 0;
  61     iss >> asNum;
  62     VERIFY( iss.eof() );
  63     VERIFY( !iss.fail() );
  64     iss.seekg(pos1);
  65     VERIFY( !iss.fail() );
  66   }
  67 }
  68
  69 int main()
  70 {
  71   test06();
  72   return 0;
  73 }