istream.tcc

gcc-you can use this code to learn something about gcc, and inquire further into linux,

// istream classes -*- C++ -*-

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
// 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

//
// ISO C++ 14882: 27.6.2  Output streams
//

#pragma GCC system_header

#include <locale>
#include <ostream> // For flush()

namespace std 
{
  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>::sentry::
    sentry(basic_istream<_CharT, _Traits>& __in, bool __noskipws)
    {
      if (__in.good()) 
	{
	  if (__in.tie())
	    __in.tie()->flush();
	  if (!__noskipws && (__in.flags() & ios_base::skipws))
	    {	  
	      const __int_type __eof = traits_type::eof();
	      __streambuf_type* __sb = __in.rdbuf();
	      __int_type __c = __sb->sgetc();

	      if (__in._M_check_facet(__in._M_fctype))
		while (!traits_type::eq_int_type(__c, __eof)
		       && __in._M_fctype->is(ctype_base::space, 
					     traits_type::to_char_type(__c)))
		  __c = __sb->snextc();

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//195.  Should basic_istream::sentry's constructor ever set eofbit? 
	      if (traits_type::eq_int_type(__c, __eof))
		__in.setstate(ios_base::eofbit);
#endif
	    }
	}

      if (__in.good())
	_M_ok = true;
      else
	{
	  _M_ok = false;
	  __in.setstate(ios_base::failbit);
	}
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(__istream_type& (*__pf)(__istream_type&))
    {
      __pf(*this);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(__ios_type& (*__pf)(__ios_type&))
    {
      __pf(*this);
      return *this;
    }
  
  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(ios_base& (*__pf)(ios_base&))
    {
      __pf(*this);
      return *this;
    }
  
  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(bool& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(short& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      long __l;
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __l);
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
	      // 118. basic_istream uses nonexistent num_get member functions.
	      if (!(__err & ios_base::failbit)
		  && (numeric_limits<short>::min() <= __l 
		      && __l <= numeric_limits<short>::max()))
		__n = __l;
	      else
                __err |= ios_base::failbit;
#endif
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(unsigned short& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(int& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      long __l;
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __l);
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
	      // 118. basic_istream uses nonexistent num_get member functions.
	      if (!(__err & ios_base::failbit)
		  && (numeric_limits<int>::min() <= __l 
		      && __l <= numeric_limits<int>::max()))
		__n = __l;
	      else
                __err |= ios_base::failbit;
#endif
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(unsigned int& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(long& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(unsigned long& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

#ifdef _GLIBCPP_USE_LONG_LONG
  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(long long& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
	      __throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(unsigned long long& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }
#endif

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(float& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(double& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try