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

   1 // Copyright (C) 2004-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 27.6.1.3 unformatted input functions
  19
  20 #include <istream>
  21 #include <sstream>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   const std::wstring str_01;
  28   const std::wstring str_02(L"soul eyes: john coltrane quartet");
  29   std::wstring strtmp;
  30
  31   std::wstringbuf isbuf_03(str_02, std::ios_base::in);
  32   std::wstringbuf isbuf_04(str_02, std::ios_base::in);
  33   std::wstringbuf isbuf_05(str_02, std::ios_base::in);
  34
  35   std::wistream is_00(&isbuf_05);
  36   std::wistream is_03(&isbuf_03);
  37   std::wistream is_04(&isbuf_04);
  38   std::ios_base::iostate state1, state2;
  39
  40   // istream& putback(char_type c)
  41   is_04.ignore(30);
  42   is_04.clear();
  43   state1 = is_04.rdstate();
  44   is_04.putback(L't');
  45   VERIFY( is_04.gcount() == 0 );  // DR 60
  46   state2 = is_04.rdstate();
  47   VERIFY( state1 == state2 );
  48   VERIFY( is_04.peek() == L't' );
  49
  50   // istream& unget()
  51   is_04.clear();
  52   state1 = is_04.rdstate();
  53   is_04.unget();
  54   VERIFY( is_04.gcount() == 0 );  // DR 60
  55   state2 = is_04.rdstate();
  56   VERIFY( state1 == state2 );
  57   VERIFY( is_04.peek() == L'r' );
  58
  59   // int sync()
  60   is_00.ignore(10);
  61   int count1 = is_00.gcount();
  62   is_00.sync();
  63   int count2 = is_00.gcount();
  64   VERIFY (count1 == count2 );     // DR 60
  65 }
  66
  67 int
  68 main()
  69 {
  70   test01();
  71   return 0;
  72 }