text: // istream classes -*- C++ -*-
  
  // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
  // 2006, 2007, 2008, 2009, 2010, 2011
  // Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // Under Section 7 of GPL version 3, you are granted additional
  // permissions described in the GCC Runtime Library Exception, version
  // 3.1, as published by the Free Software Foundation.
  
  // You should have received a copy of the GNU General Public License and
  // a copy of the GCC Runtime Library Exception along with this program;
  // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  // <http://www.gnu.org/licenses/>.
  
  /** @file bits/istream.tcc
   *  This is an internal header file, included by other library headers.
   *  Do not attempt to use it directly. @headername{istream}
   */
  
  //
  // ISO C++ 14882: 27.6.1  Input streams
  //
  
  #ifndef _ISTREAM_TCC
  #define _ISTREAM_TCC 1
  
  #pragma GCC system_header
  
  #include <bits/cxxabi_forced.h>
  
  namespace std _GLIBCXX_VISIBILITY(default)
  {
  _GLIBCXX_BEGIN_NAMESPACE_VERSION
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>::sentry::
      sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false)
      {
        ios_base::iostate __err = ios_base::goodbit;
        if (__in.good())
  	{
  	  if (__in.tie())
  	    __in.tie()->flush();
  	  if (!__noskip && bool(__in.flags() & ios_base::skipws))
  	    {
  	      const __int_type __eof = traits_type::eof();
  	      __streambuf_type* __sb = __in.rdbuf();
  	      __int_type __c = __sb->sgetc();
  
  	      const __ctype_type& __ct = __check_facet(__in._M_ctype);
  	      while (!traits_type::eq_int_type(__c, __eof)
  		     && __ct.is(ctype_base::space, 
  				traits_type::to_char_type(__c)))
  		__c = __sb->snextc();
  
  	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
  	      // 195. Should basic_istream::sentry's constructor ever
  	      // set eofbit?
  	      if (traits_type::eq_int_type(__c, __eof))
  		__err |= ios_base::eofbit;
  	    }
  	}
  
        if (__in.good() && __err == ios_base::goodbit)
  	_M_ok = true;
        else
  	{
  	  __err |= ios_base::failbit;
  	  __in.setstate(__err);
  	}
      }
  
    template<typename _CharT, typename _Traits>
      template<typename _ValueT>
        basic_istream<_CharT, _Traits>&
        basic_istream<_CharT, _Traits>::
        _M_extract(_ValueT& __v)
        {
  	sentry __cerb(*this, false);
  	if (__cerb)
  	  {
  	    ios_base::iostate __err = ios_base::goodbit;
  	    __try
  	      {
  		const __num_get_type& __ng = __check_facet(this->_M_num_get);
  		__ng.get(*this, 0, *this, __err, __v);
  	      }
  	    __catch(__cxxabiv1::__forced_unwind&)
  	      {
  		this->_M_setstate(ios_base::badbit);
  		__throw_exception_again;
  	      }
  	    __catch(...)
  	      { this->_M_setstate(ios_base::badbit); }
  	    if (__err)
  	      this->setstate(__err);
  	  }
  	return *this;
        }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      operator>>(short& __n)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 118. basic_istream uses nonexistent num_get member functions.
        sentry __cerb(*this, false);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      long __l;
  	      const __num_get_type& __ng = __check_facet(this->_M_num_get);
  	      __ng.get(*this, 0, *this, __err, __l);
  
  	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
  	      // 696. istream::operator>>(int&) broken.
  	      if (__l < __gnu_cxx::__numeric_traits<short>::__min)
  		{
  		  __err |= ios_base::failbit;
  		  __n = __gnu_cxx::__numeric_traits<short>::__min;
  		}
  	      else if (__l > __gnu_cxx::__numeric_traits<short>::__max)
  		{
  		  __err |= ios_base::failbit;
  		  __n = __gnu_cxx::__numeric_traits<short>::__max;
  		}
  	      else
  		__n = short(__l);
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      operator>>(int& __n)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 118. basic_istream uses nonexistent num_get member functions.
        sentry __cerb(*this, false);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      long __l;
  	      const __num_get_type& __ng = __check_facet(this->_M_num_get);
  	      __ng.get(*this, 0, *this, __err, __l);
  
  	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
  	      // 696. istream::operator>>(int&) broken.
  	      if (__l < __gnu_cxx::__numeric_traits<int>::__min)
  		{
  		  __err |= ios_base::failbit;
  		  __n = __gnu_cxx::__numeric_traits<int>::__min;
  		}
  	      else if (__l > __gnu_cxx::__numeric_traits<int>::__max)
  		{
  		  __err |= ios_base::failbit;	      
  		  __n = __gnu_cxx::__numeric_traits<int>::__max;
  		}
  	      else
  		__n = int(__l);
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      operator>>(__streambuf_type* __sbout)
      {
        ios_base::iostate __err = ios_base::goodbit;
        sentry __cerb(*this, false);
        if (__cerb && __sbout)
  	{
  	  __try
  	    {
  	      bool __ineof;
  	      if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof))
  		__err |= ios_base::failbit;
  	      if (__ineof)
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::failbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::failbit); }
  	}
        else if (!__sbout)
  	__err |= ios_base::failbit;
        if (__err)
  	this->setstate(__err);
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      typename basic_istream<_CharT, _Traits>::int_type
      basic_istream<_CharT, _Traits>::
      get(void)
      {
        const int_type __eof = traits_type::eof();
        int_type __c = __eof;
        _M_gcount = 0;
        ios_base::iostate __err = ios_base::goodbit;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  __try
  	    {
  	      __c = this->rdbuf()->sbumpc();
  	      // 27.6.1.1 paragraph 3
  	      if (!traits_type::eq_int_type(__c, __eof))
  		_M_gcount = 1;
  	      else
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	}
        if (!_M_gcount)
  	__err |= ios_base::failbit;
        if (__err)
  	this->setstate(__err);
        return __c;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      get(char_type& __c)
      {
        _M_gcount = 0;
        ios_base::iostate __err = ios_base::goodbit;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  __try
  	    {
  	      const int_type __cb = this->rdbuf()->sbumpc();
  	      // 27.6.1.1 paragraph 3
  	      if (!traits_type::eq_int_type(__cb, traits_type::eof()))
  		{
  		  _M_gcount = 1;
  		  __c = traits_type::to_char_type(__cb);
  		}
  	      else
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	}
        if (!_M_gcount)
  	__err |= ios_base::failbit;
        if (__err)
  	this->setstate(__err);
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      get(char_type* __s, streamsize __n, char_type __delim)
      {
        _M_gcount = 0;
        ios_base::iostate __err = ios_base::goodbit;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  __try
  	    {
  	      const int_type __idelim = traits_type::to_int_type(__delim);
  	      const int_type __eof = traits_type::eof();
  	      __streambuf_type* __sb = this->rdbuf();
  	      int_type __c = __sb->sgetc();
  
  	      while (_M_gcount + 1 < __n
  		     && !traits_type::eq_int_type(__c, __eof)
  		     && !traits_type::eq_int_type(__c, __idelim))
  		{
  		  *__s++ = traits_type::to_char_type(__c);
  		  ++_M_gcount;
  		  __c = __sb->snextc();
  		}
  	      if (traits_type::eq_int_type(__c, __eof))
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	}
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 243. get and getline when sentry reports failure.
        if (__n > 0)
  	*__s = char_type();
        if (!_M_gcount)
  	__err |= ios_base::failbit;
        if (__err)
  	this->setstate(__err);
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      get(__streambuf_type& __sb, char_type __delim)
      {
        _M_gcount = 0;
        ios_base::iostate __err = ios_base::goodbit;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  __try
  	    {
  	      const int_type __idelim = traits_type::to_int_type(__delim);
  	      const int_type __eof = traits_type::eof();
  	      __streambuf_type* __this_sb = this->rdbuf();
  	      int_type __c = __this_sb->sgetc();
  	      char_type __c2 = traits_type::to_char_type(__c);
  
  	      while (!traits_type::eq_int_type(__c, __eof)
  		     && !traits_type::eq_int_type(__c, __idelim)
  		     && !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
  		{
  		  ++_M_gcount;
  		  __c = __this_sb->snextc();
  		  __c2 = traits_type::to_char_type(__c);
  		}
  	      if (traits_type::eq_int_type(__c, __eof))
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	}
        if (!_M_gcount)
  	__err |= ios_base::failbit;
        if (__err)
  	this->setstate(__err);
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      getline(char_type* __s, streamsize __n, char_type __delim)
      {
        _M_gcount = 0;
        ios_base::iostate __err = ios_base::goodbit;
        sentry __cerb(*this, true);
        if (__cerb)
          {
            __try
              {
                const int_type __idelim = traits_type::to_int_type(__delim);
                const int_type __eof = traits_type::eof();
                __streambuf_type* __sb = this->rdbuf();
                int_type __c = __sb->sgetc();
  
                while (_M_gcount + 1 < __n
                       && !traits_type::eq_int_type(__c, __eof)
                       && !traits_type::eq_int_type(__c, __idelim))
                  {
                    *__s++ = traits_type::to_char_type(__c);
                    __c = __sb->snextc();
                    ++_M_gcount;
                  }
                if (traits_type::eq_int_type(__c, __eof))
                  __err |= ios_base::eofbit;
                else
                  {
                    if (traits_type::eq_int_type(__c, __idelim))
                      {
                        __sb->sbumpc();
                        ++_M_gcount;
                      }
                    else
                      __err |= ios_base::failbit;
                  }
              }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
            __catch(...)
              { this->_M_setstate(ios_base::badbit); }
          }
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 243. get and getline when sentry reports failure.
        if (__n > 0)
  	*__s = char_type();
        if (!_M_gcount)
          __err |= ios_base::failbit;
        if (__err)
          this->setstate(__err);
        return *this;
      }
  
    // We provide three overloads, since the first two are much simpler
    // than the general case. Also, the latter two can thus adopt the
    // same "batchy" strategy used by getline above.
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      ignore(void)
      {
        _M_gcount = 0;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      const int_type __eof = traits_type::eof();
  	      __streambuf_type* __sb = this->rdbuf();
  
  	      if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
  		__err |= ios_base::eofbit;
  	      else
  		_M_gcount = 1;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      ignore(streamsize __n)
      {
        _M_gcount = 0;
        sentry __cerb(*this, true);
        if (__cerb && __n > 0)
          {
            ios_base::iostate __err = ios_base::goodbit;
            __try
              {
                const int_type __eof = traits_type::eof();
                __streambuf_type* __sb = this->rdbuf();
                int_type __c = __sb->sgetc();
  
  	      // N.B. On LFS-enabled platforms streamsize is still 32 bits
  	      // wide: if we want to implement the standard mandated behavior
  	      // for n == max() (see 27.6.1.3/24) we are at risk of signed
  	      // integer overflow: thus these contortions. Also note that,
  	      // by definition, when more than 2G chars are actually ignored,
  	      // _M_gcount (the return value of gcount, that is) cannot be
  	      // really correct, being unavoidably too small.
  	      bool __large_ignore = false;
  	      while (true)
  		{
  		  while (_M_gcount < __n
  			 && !traits_type::eq_int_type(__c, __eof))
  		    {
  		      ++_M_gcount;
  		      __c = __sb->snextc();
  		    }
  		  if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
  		      && !traits_type::eq_int_type(__c, __eof))
  		    {
  		      _M_gcount =
  			__gnu_cxx::__numeric_traits<streamsize>::__min;
  		      __large_ignore = true;
  		    }
  		  else
  		    break;
  		}
  
  	      if (__large_ignore)
  		_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
  
  	      if (traits_type::eq_int_type(__c, __eof))
                  __err |= ios_base::eofbit;
              }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
            __catch(...)
              { this->_M_setstate(ios_base::badbit); }
            if (__err)
              this->setstate(__err);
          }
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      ignore(streamsize __n, int_type __delim)
      {
        _M_gcount = 0;
        sentry __cerb(*this, true);
        if (__cerb && __n > 0)
          {
            ios_base::iostate __err = ios_base::goodbit;
            __try
              {
                const int_type __eof = traits_type::eof();
                __streambuf_type* __sb = this->rdbuf();
                int_type __c = __sb->sgetc();
  
  	      // See comment above.
  	      bool __large_ignore = false;
  	      while (true)
  		{
  		  while (_M_gcount < __n
  			 && !traits_type::eq_int_type(__c, __eof)
  			 && !traits_type::eq_int_type(__c, __delim))
  		    {
  		      ++_M_gcount;
  		      __c = __sb->snextc();
  		    }
  		  if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
  		      && !traits_type::eq_int_type(__c, __eof)
  		      && !traits_type::eq_int_type(__c, __delim))
  		    {
  		      _M_gcount =
  			__gnu_cxx::__numeric_traits<streamsize>::__min;
  		      __large_ignore = true;
  		    }
  		  else
  		    break;
  		}
  
  	      if (__large_ignore)
  		_M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
  
                if (traits_type::eq_int_type(__c, __eof))
                  __err |= ios_base::eofbit;
  	      else if (traits_type::eq_int_type(__c, __delim))
  		{
  		  if (_M_gcount
  		      < __gnu_cxx::__numeric_traits<streamsize>::__max)
  		    ++_M_gcount;
  		  __sb->sbumpc();
  		}
              }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
            __catch(...)
              { this->_M_setstate(ios_base::badbit); }
            if (__err)
              this->setstate(__err);
          }
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      typename basic_istream<_CharT, _Traits>::int_type
      basic_istream<_CharT, _Traits>::
      peek(void)
      {
        int_type __c = traits_type::eof();
        _M_gcount = 0;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      __c = this->rdbuf()->sgetc();
  	      if (traits_type::eq_int_type(__c, traits_type::eof()))
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return __c;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      read(char_type* __s, streamsize __n)
      {
        _M_gcount = 0;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      _M_gcount = this->rdbuf()->sgetn(__s, __n);
  	      if (_M_gcount != __n)
  		__err |= (ios_base::eofbit | ios_base::failbit);
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      streamsize
      basic_istream<_CharT, _Traits>::
      readsome(char_type* __s, streamsize __n)
      {
        _M_gcount = 0;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      // Cannot compare int_type with streamsize generically.
  	      const streamsize __num = this->rdbuf()->in_avail();
  	      if (__num > 0)
  		_M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
  	      else if (__num == -1)
  		__err |= ios_base::eofbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return _M_gcount;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      putback(char_type __c)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 60. What is a formatted input function?
        _M_gcount = 0;
        // Clear eofbit per N3168.
        this->clear(this->rdstate() & ~ios_base::eofbit);
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      const int_type __eof = traits_type::eof();
  	      __streambuf_type* __sb = this->rdbuf();
  	      if (!__sb
  		  || traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
  		__err |= ios_base::badbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      unget(void)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 60. What is a formatted input function?
        _M_gcount = 0;
        // Clear eofbit per N3168.
        this->clear(this->rdstate() & ~ios_base::eofbit);
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      const int_type __eof = traits_type::eof();
  	      __streambuf_type* __sb = this->rdbuf();
  	      if (!__sb
  		  || traits_type::eq_int_type(__sb->sungetc(), __eof))
  		__err |= ios_base::badbit;
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      int
      basic_istream<_CharT, _Traits>::
      sync(void)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // DR60.  Do not change _M_gcount.
        int __ret = -1;
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      __streambuf_type* __sb = this->rdbuf();
  	      if (__sb)
  		{
  		  if (__sb->pubsync() == -1)
  		    __err |= ios_base::badbit;
  		  else
  		    __ret = 0;
  		}
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return __ret;
      }
  
    template<typename _CharT, typename _Traits>
      typename basic_istream<_CharT, _Traits>::pos_type
      basic_istream<_CharT, _Traits>::
      tellg(void)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // DR60.  Do not change _M_gcount.
        pos_type __ret = pos_type(-1);
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  __try
  	    {
  	      if (!this->fail())
  		__ret = this->rdbuf()->pubseekoff(0, ios_base::cur,
  						  ios_base::in);
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	}
        return __ret;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      seekg(pos_type __pos)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // DR60.  Do not change _M_gcount.
        // Clear eofbit per N3168.
        this->clear(this->rdstate() & ~ios_base::eofbit);
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      if (!this->fail())
  		{
  		  // 136.  seekp, seekg setting wrong streams?
  		  const pos_type __p = this->rdbuf()->pubseekpos(__pos,
  								 ios_base::in);
  		  
  		  // 129.  Need error indication from seekp() and seekg()
  		  if (__p == pos_type(off_type(-1)))
  		    __err |= ios_base::failbit;
  		}
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      basic_istream<_CharT, _Traits>::
      seekg(off_type __off, ios_base::seekdir __dir)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // DR60.  Do not change _M_gcount.
        // Clear eofbit per N3168.
        this->clear(this->rdstate() & ~ios_base::eofbit);
        sentry __cerb(*this, true);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      if (!this->fail())
  		{
  		  // 136.  seekp, seekg setting wrong streams?
  		  const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
  								 ios_base::in);
  	      
  		  // 129.  Need error indication from seekp() and seekg()
  		  if (__p == pos_type(off_type(-1)))
  		    __err |= ios_base::failbit;
  		}
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      this->_M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { this->_M_setstate(ios_base::badbit); }
  	  if (__err)
  	    this->setstate(__err);
  	}
        return *this;
      }
  
    // 27.6.1.2.3 Character extraction templates
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      {
        typedef basic_istream<_CharT, _Traits>		__istream_type;
        typedef typename __istream_type::int_type         __int_type;
  
        typename __istream_type::sentry __cerb(__in, false);
        if (__cerb)
  	{
  	  ios_base::iostate __err = ios_base::goodbit;
  	  __try
  	    {
  	      const __int_type __cb = __in.rdbuf()->sbumpc();
  	      if (!_Traits::eq_int_type(__cb, _Traits::eof()))
  		__c = _Traits::to_char_type(__cb);
  	      else
  		__err |= (ios_base::eofbit | ios_base::failbit);
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      __in._M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { __in._M_setstate(ios_base::badbit); }
  	  if (__err)
  	    __in.setstate(__err);
  	}
        return __in;
      }
  
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      {
        typedef basic_istream<_CharT, _Traits>		__istream_type;
        typedef basic_streambuf<_CharT, _Traits>          __streambuf_type;
        typedef typename _Traits::int_type		int_type;
        typedef _CharT					char_type;
        typedef ctype<_CharT>				__ctype_type;
  
        streamsize __extracted = 0;
        ios_base::iostate __err = ios_base::goodbit;
        typename __istream_type::sentry __cerb(__in, false);
        if (__cerb)
  	{
  	  __try
  	    {
  	      // Figure out how many characters to extract.
  	      streamsize __num = __in.width();
  	      if (__num <= 0)
  		__num = __gnu_cxx::__numeric_traits<streamsize>::__max;
  
  	      const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
  
  	      const int_type __eof = _Traits::eof();
  	      __streambuf_type* __sb = __in.rdbuf();
  	      int_type __c = __sb->sgetc();
  
  	      while (__extracted < __num - 1
  		     && !_Traits::eq_int_type(__c, __eof)
  		     && !__ct.is(ctype_base::space,
  				 _Traits::to_char_type(__c)))
  		{
  		  *__s++ = _Traits::to_char_type(__c);
  		  ++__extracted;
  		  __c = __sb->snextc();
  		}
  	      if (_Traits::eq_int_type(__c, __eof))
  		__err |= ios_base::eofbit;
  
  	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
  	      // 68.  Extractors for char* should store null at end
  	      *__s = char_type();
  	      __in.width(0);
  	    }
  	  __catch(__cxxabiv1::__forced_unwind&)
  	    {
  	      __in._M_setstate(ios_base::badbit);
  	      __throw_exception_again;
  	    }
  	  __catch(...)
  	    { __in._M_setstate(ios_base::badbit); }
  	}
        if (!__extracted)
  	__err |= ios_base::failbit;
        if (__err)
  	__in.setstate(__err);
        return __in;
      }
  
    // 27.6.1.4 Standard basic_istream manipulators
    template<typename _CharT, typename _Traits>
      basic_istream<_CharT, _Traits>&
      ws(basic_istream<_CharT, _Traits>& __in)
      {
        typedef basic_istream<_CharT, _Traits>		__istream_type;
        typedef basic_streambuf<_CharT, _Traits>          __streambuf_type;
        typedef typename __istream_type::int_type		__int_type;
        typedef ctype<_CharT>				__ctype_type;
  
        const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
        const __int_type __eof = _Traits::eof();
        __streambuf_type* __sb = __in.rdbuf();
        __int_type __c = __sb->sgetc();
  
        while (!_Traits::eq_int_type(__c, __eof)
  	     && __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
  	__c = __sb->snextc();
  
         if (_Traits::eq_int_type(__c, __eof))
  	 __in.setstate(ios_base::eofbit);
        return __in;
      }
  
    // Inhibit implicit instantiations for required instantiations,
    // which are defined via explicit instantiations elsewhere.
  #if _GLIBCXX_EXTERN_TEMPLATE
    extern template class basic_istream<char>;
    extern template istream& ws(istream&);
    extern template istream& operator>>(istream&, char&);
    extern template istream& operator>>(istream&, char*);
    extern template istream& operator>>(istream&, unsigned char&);
    extern template istream& operator>>(istream&, signed char&);
    extern template istream& operator>>(istream&, unsigned char*);
    extern template istream& operator>>(istream&, signed char*);
  
    extern template istream& istream::_M_extract(unsigned short&);
    extern template istream& istream::_M_extract(unsigned int&);  
    extern template istream& istream::_M_extract(long&);
    extern template istream& istream::_M_extract(unsigned long&);
    extern template istream& istream::_M_extract(bool&);
  #ifdef _GLIBCXX_USE_LONG_LONG
    extern template istream& istream::_M_extract(long long&);
    extern template istream& istream::_M_extract(unsigned long long&);
  #endif
    extern template istream& istream::_M_extract(float&);
    extern template istream& istream::_M_extract(double&);
    extern template istream& istream::_M_extract(long double&);
    extern template istream& istream::_M_extract(void*&);
  
    extern template class basic_iostream<char>;
  
  #ifdef _GLIBCXX_USE_WCHAR_T
    extern template class basic_istream<wchar_t>;
    extern template wistream& ws(wistream&);
    extern template wistream& operator>>(wistream&, wchar_t&);
    extern template wistream& operator>>(wistream&, wchar_t*);
  
    extern template wistream& wistream::_M_extract(unsigned short&);
    extern template wistream& wistream::_M_extract(unsigned int&);  
    extern template wistream& wistream::_M_extract(long&);
    extern template wistream& wistream::_M_extract(unsigned long&);
    extern template wistream& wistream::_M_extract(bool&);
  #ifdef _GLIBCXX_USE_LONG_LONG
    extern template wistream& wistream::_M_extract(long long&);
    extern template wistream& wistream::_M_extract(unsigned long long&);
  #endif
    extern template wistream& wistream::_M_extract(float&);
    extern template wistream& wistream::_M_extract(double&);
    extern template wistream& wistream::_M_extract(long double&);
    extern template wistream& wistream::_M_extract(void*&);
  
    extern template class basic_iostream<wchar_t>;
  #endif
  #endif
  
  _GLIBCXX_END_NAMESPACE_VERSION
  } // namespace std
  
  #endif
  