text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <iterator>
  
  // istreambuf_iterator
  
  // istreambuf_iterator<charT,traits>&
  //   istreambuf_iterator<charT,traits>::operator++();
  
  #include <iterator>
  #include <sstream>
  #include <cassert>
  
  int main()
  {
      {
          std::istringstream inf("abc");
          std::istreambuf_iterator<char> i(inf);
          assert(*i == 'a');
          assert(*++i == 'b');
          assert(*++i == 'c');
          assert(++i == std::istreambuf_iterator<char>());
      }
      {
          std::wistringstream inf(L"abc");
          std::istreambuf_iterator<wchar_t> i(inf);
          assert(*i == L'a');
          assert(*++i == L'b');
          assert(*++i == L'c');
          assert(++i == std::istreambuf_iterator<wchar_t>());
      }
  }
  