libstdc++-v3/testsuite/27_io/basic_istream/putback/char/1.cc

   1 // 1999-08-11 bkoz
   2
   3 // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2009 Free Software Foundation
   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
  22 #include <istream>
  23 #include <sstream>
  24 #include <testsuite_hooks.h>
  25
  26 void
  27 test01()
  28 {
  29   bool test __attribute__((unused)) = true;
  30   const std::string str_01;
  31   const std::string str_02("soul eyes: john coltrane quartet");
  32   std::string strtmp;
  33
  34   std::stringbuf isbuf_03(str_02, std::ios_base::in);
  35   std::stringbuf isbuf_04(str_02, std::ios_base::in);
  36   std::stringbuf isbuf_05(str_02, std::ios_base::in);
  37
  38   std::istream is_00(&isbuf_05);
  39   std::istream is_03(&isbuf_03);
  40   std::istream is_04(&isbuf_04);
  41   std::ios_base::iostate state1, state2;
  42
  43   // istream& putback(char c)
  44   is_04.ignore(30);
  45   is_04.clear();
  46   state1 = is_04.rdstate();
  47   is_04.putback('t');
  48   VERIFY( is_04.gcount() == 0 );  // DR 60
  49   state2 = is_04.rdstate();
  50   VERIFY( state1 == state2 );
  51   VERIFY( is_04.peek() == 't' );
  52
  53   // istream& unget()
  54   is_04.clear();
  55   state1 = is_04.rdstate();
  56   is_04.unget();
  57   VERIFY( is_04.gcount() == 0 );  // DR 60
  58   state2 = is_04.rdstate();
  59   VERIFY( state1 == state2 );
  60   VERIFY( is_04.peek() == 'r' );
  61
  62   // int sync()
  63   is_00.ignore(10);
  64   int count1 = is_00.gcount();
  65   is_00.sync();
  66   int count2 = is_00.gcount();
  67   VERIFY (count1 == count2 );     // DR 60
  68 }
  69
  70 int
  71 main()
  72 {
  73   test01();
  74   return 0;
  75 }