libstdc++-v3/testsuite/27_io/objects/char/12048-1.cc

   1 // Derived from libstdc++/12048 by LJR <ljrittle@acm.org> with
   2 // reminder from Petur Runolfsson <peturr02@ru.is>.
   3
   4 // Copyright (C) 2003-2024 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // { dg-require-fileio "" }
  22
  23 #include <iostream>
  24 #include <cstdio>
  25 #include <testsuite_hooks.h>
  26
  27 void
  28 test01()
  29 {
  30   VERIFY( std::freopen("cin_unget-1.txt", "r", stdin) );
  31
  32   char c1;
  33   char c2;
  34   std::cin.get(c1);
  35   std::cin.unget();
  36   std::cin.get(c2);
  37   VERIFY( std::cin.good() );
  38   VERIFY( c1 == c2 );
  39 }
  40
  41 int main(void)
  42 {
  43   test01();
  44   return 0;
  45 }