libstdc++-v3/testsuite/27_io/basic_istream/tellg/wchar_t/1.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 // { dg-require-fileio "" }
  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 #include <istream>
  26 #include <sstream>
  27 #include <fstream>
  28 #include <testsuite_hooks.h>
  29
  30 void test01()
  31 {
  32   using namespace std;
  33   typedef ios::off_type off_type;
  34   typedef ios::pos_type pos_type;
  35
  36   const char str_lit01[] = "wistream_seeks-1.tst";
  37
  38   // in
  39   wistringstream ist1;
  40   pos_type p3 = ist1.tellg();
  41
  42   wifstream ifs1;
  43   pos_type p4 = ifs1.tellg();
  44
  45   // N.B. We implement the resolution of DR 453 and
  46   // istringstream::tellg() doesn't fail.
  47   VERIFY( p3 == pos_type(off_type(0)) );
  48   VERIFY( p4 == pos_type(off_type(-1)) );
  49
  50   // in
  51   // test ctors leave things in the same positions...
  52   wistringstream ist2(L"bob_marley:kaya");
  53   p3 = ist2.tellg();
  54
  55   wifstream ifs2(str_lit01);
  56   p4 = ifs2.tellg();
  57
  58   VERIFY( p3 == p4 );
  59 }
  60
  61 int main()
  62 {
  63   test01();
  64   return 0;
  65 }