libstdc++-v3/testsuite/27_io/basic_istream/peek/char/6414.cc

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000-2022 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 #include <istream>
  26 #include <fstream>
  27 #include <testsuite_hooks.h>
  28
  29 // fstreams
  30 void test04(void)
  31 {
  32   std::istream::pos_type pos01, pos02;
  33   const char str_lit01[] = "istream_seeks-1.txt";
  34   std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
  35
  36   // libstdc++/6414
  37   if01.seekg(0, std::ios_base::beg);
  38   pos01 = if01.tellg();
  39   if01.peek();
  40   pos02 = if01.tellg();
  41   VERIFY( pos02 == pos01 );
  42 }
  43
  44 int main()
  45 {
  46   test04();
  47   return 0;
  48 }