libstdc++-v3/testsuite/27_io/basic_istream/seekg/char/2.cc

   1 // 2003-04-22 pme
   2
   3 // Copyright (C) 2003-2024 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 // DR 60 -- seekg does not effect calls to gcount
  22
  23 #include <istream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 void test01()
  28 {
  29   using namespace std;
  30
  31   istringstream ist("the lamb lies down on broadway");
  32   ios::pos_type pos = ist.tellg();
  33   ist.ignore(4);
  34   int count1 = ist.gcount();
  35   ist.seekg(pos);
  36   int count2 = ist.gcount();
  37   VERIFY( count1 == count2 );
  38   ist.seekg(ios::off_type(pos), ios::beg);
  39   count2 = ist.gcount();
  40   VERIFY( count1 == count2 );
  41 }
  42
  43 int main()
  44 {
  45   test01();
  46   return 0;
  47 }