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 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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // 27.6.1.3 unformatted input functions
  22
  23 #include <istream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 void
  28 test01()
  29 {
  30   bool test __attribute__((unused)) = true;
  31   const std::string str_01;
  32   const std::string str_02("soul eyes: john coltrane quartet");
  33   std::string strtmp;
  34
  35   std::stringbuf isbuf_03(str_02, std::ios_base::in);
  36   std::stringbuf isbuf_04(str_02, std::ios_base::in);
  37   std::stringbuf isbuf_05(str_02, std::ios_base::in);
  38
  39   std::istream is_00(&isbuf_05);
  40   std::istream is_03(&isbuf_03);
  41   std::istream is_04(&isbuf_04);
  42   std::ios_base::iostate state1, state2;
  43
  44   // istream& putback(char c)
  45   is_04.ignore(30);
  46   is_04.clear();
  47   state1 = is_04.rdstate();
  48   is_04.putback('t');
  49   VERIFY( is_04.gcount() == 0 );  // DR 60
  50   state2 = is_04.rdstate();
  51   VERIFY( state1 == state2 );
  52   VERIFY( is_04.peek() == 't' );
  53
  54   // istream& unget()
  55   is_04.clear();
  56   state1 = is_04.rdstate();
  57   is_04.unget();
  58   VERIFY( is_04.gcount() == 0 );  // DR 60
  59   state2 = is_04.rdstate();
  60   VERIFY( state1 == state2 );
  61   VERIFY( is_04.peek() == 'r' );
  62
  63   // int sync()
  64   is_00.ignore(10);
  65   int count1 = is_00.gcount();
  66   is_00.sync();
  67   int count2 = is_00.gcount();
  68   VERIFY (count1 == count2 );     // DR 60
  69 }
  70
  71 int
  72 main()
  73 {
  74   test01();
  75   return 0;
  76 }