libstdc++-v3/testsuite/27_io/basic_istream/peek/wchar_t/6414.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 // @require@ %-*.tst %-*.txt
  21 // @diff@ %-*.tst %-*.txt
  22
  23 #include <istream>
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26
  27 // fstreams
  28 void test04(void)
  29 {
  30   std::wistream::pos_type pos01, pos02;
  31   const char str_lit01[] = "wistream_seeks-1.txt";
  32   std::wifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
  33
  34   // libstdc++/6414
  35   if01.seekg(0, std::ios_base::beg);
  36   pos01 = if01.tellg();
  37   if01.peek();
  38   pos02 = if01.tellg();
  39   VERIFY( pos02 == pos01 );
  40 }
  41
  42 int main()
  43 {
  44   test04();
  45   return 0;
  46 }