libstdc++-v3/testsuite/27_io/basic_istream/tellg/char/1.cc

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000-2021 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 // @require@ %-*.tst %-*.txt
  23 // @diff@ %-*.tst %-*.txt
  24
  25 // { dg-require-fileio "" }
  26
  27 #include <istream>
  28 #include <sstream>
  29 #include <fstream>
  30 #include <testsuite_hooks.h>
  31
  32 void test01()
  33 {
  34   using namespace std;
  35   typedef ios::off_type off_type;
  36   typedef ios::pos_type pos_type;
  37
  38   const char str_lit01[] = "istream_seeks-1.tst";
  39
  40   // in
  41   istringstream ist1;
  42   pos_type p3 = ist1.tellg();
  43
  44   ifstream ifs1;
  45   pos_type p4 = ifs1.tellg();
  46
  47   // N.B. We implement the resolution of DR 453 and
  48   // istringstream::tellg() doesn't fail.
  49   VERIFY( p3 == pos_type(off_type(0)) );
  50   VERIFY( p4 == pos_type(off_type(-1)) );
  51
  52   // in
  53   // test ctors leave things in the same positions...
  54   istringstream ist2("bob_marley:kaya");
  55   p3 = ist2.tellg();
  56
  57   ifstream ifs2(str_lit01);
  58   p4 = ifs2.tellg();
  59
  60   VERIFY( p3 == p4 );
  61 }
  62
  63 int main()
  64 {
  65   test01();
  66   return 0;
  67 }