libstdc++-v3/testsuite/27_io/objects/char/12048-5.cc

   1 // Derived from libstdc++/12048 by LJR <ljrittle@acm.org> with
   2 // reminder from Petur Runolfsson <peturr02@ru.is>.
   3
   4 // Copyright (C) 2003-2018 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 // DR 49 states that cin.rdbuf()->sbumpc() and fgetc(stdin) should be
  22 // equivalent and interchangable. Currently however, cin.rdbuf()->sungetc()
  23 // only returns characters that were read with cin.rdbuf()->sbumpc()
  24
  25 // { dg-do run { xfail *-*-* } }
  26 // { dg-require-fileio "" }
  27
  28 #include <iostream>
  29 #include <cstdio>
  30 #include <testsuite_hooks.h>
  31
  32 void
  33 test01()
  34 {
  35   VERIFY( std::freopen("cin_unget-1.txt", "r", stdin) );
  36
  37   char c1;
  38   int c2;
  39   char c3;
  40   std::cin.get(c1);
  41   c2 = std::fgetc(stdin);
  42   std::cin.unget();
  43   if (std::cin.good())
  44     {
  45       std::cin.get(c3);
  46       VERIFY( std::cin.good() );
  47       VERIFY( c3 == std::char_traits<char>::to_char_type(c2) );
  48     }
  49 }
  50
  51 int main(void)
  52 {
  53   test01();
  54   return 0;
  55 }