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// Streambuf iterators

// Copyright (C) 1997-2001 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.

// XXX Should specialize copy, find algorithms for streambuf iterators.

#ifndef _CPP_BITS_SBUF_ITER_H

#define _CPP_BITS_SBUF_ITER_H 1

#pragma GCC system_header

namespace std

{

  template

    class ostreambuf_iterator

    : public iterator

    {

    public:

      // Types:

      typedef _CharT                           char_type;

      typedef _Traits                          traits_type;

      typedef basic_streambuf<_CharT, _Traits> streambuf_type;

      typedef basic_ostream<_CharT, _Traits>   ostream_type;

    private:

      streambuf_type* 	_M_sbuf;

      bool 		_M_failed;

    public:

      inline

      ostreambuf_iterator(ostream_type& __s) throw ()

      : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }

      ostreambuf_iterator(streambuf_type* __s) throw ()

      : _M_sbuf(__s), _M_failed(!_M_sbuf) { }

      ostreambuf_iterator&

      operator=(_CharT __c);

      ostreambuf_iterator&

      operator*() throw()

      { return *this; }

      ostreambuf_iterator&

      operator++(int) throw()

      { return *this; }

      ostreambuf_iterator&

      operator++() throw()

      { return *this; }

      bool

      failed() const throw()

      { return _M_failed; }

    };

  template

    inline ostreambuf_iterator<_CharT, _Traits>&

    ostreambuf_iterator<_CharT, _Traits>::operator=(_CharT __c)

    {

      if (!_M_failed &&

          _Traits::eq_int_type(_M_sbuf->sputc(__c),_Traits::eof()))

      _M_failed = true;

      return *this;

    }

  // 24.5.3 Template class istreambuf_iterator

  template

    class istreambuf_iterator

    : public iterator

    		      _CharT*, _CharT&>

    {

    public:

      // Types:

      typedef _CharT                         		char_type;

      typedef _Traits                        		traits_type;

      typedef typename _Traits::int_type     		int_type;

      typedef basic_streambuf<_CharT, _Traits> 		streambuf_type;

      typedef basic_istream<_CharT, _Traits>         	istream_type;

      // Non-standard Types:

      typedef istreambuf_iterator<_CharT, _Traits>	__istreambufiter_type;

    private:

      // 24.5.3 istreambuf_iterator

      // p 1

      // If the end of stream is reached (streambuf_type::sgetc()

      // returns traits_type::eof()), the iterator becomes equal to

      // the "end of stream" iterator value.

      // NB: This implementation assumes the "end of stream" value

      // is EOF, or -1.

      streambuf_type* 		_M_sbuf;

      int_type 			_M_c;

    public:

      istreambuf_iterator() throw()

      : _M_sbuf(NULL), _M_c(-2) { }

      istreambuf_iterator(istream_type& __s) throw()

      : _M_sbuf(__s.rdbuf()), _M_c(-2) { }

      istreambuf_iterator(streambuf_type* __s) throw()

      : _M_sbuf(__s), _M_c(-2) { }

      // NB: This should really have an int_type return

      // value, so "end of stream" postion can be checked without

      // hacking.

      char_type

      operator*() const

      {

	// The result of operator*() on an end of stream is undefined.

	char_type __ret;

	if (_M_sbuf && _M_c != static_cast(-2))

	  __ret = _M_c;

	else if (_M_sbuf)

	  __ret = traits_type::to_char_type(_M_sbuf->sgetc());

	else

	  __ret = static_cast(traits_type::eof());

	return __ret;

      }

      __istreambufiter_type&

      operator++()

      {

	if (_M_sbuf)

	  _M_sbuf->sbumpc();

	_M_c = -2;

	return *this;

      }

      __istreambufiter_type

      operator++(int)

      {

	__istreambufiter_type __old = *this;

	if (_M_sbuf)

	  __old._M_c = _M_sbuf->sbumpc();

	_M_c = -2;

	return __old;

      }

      bool

      equal(const __istreambufiter_type& __b)

      {

	int_type __eof = traits_type::eof();

	bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof;

	bool __beof = !__b._M_sbuf

	  	      || __b._M_sbuf->sgetc() == __eof;

	return (__thiseof && __beof || (!__thiseof && !__beof));

      }

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS

      // 110 istreambuf_iterator::equal not const

      // NB: there is also number 111 pending on this function.

      bool

      equal(const __istreambufiter_type& __b) const

      {

	int_type __eof = traits_type::eof();

	bool __thiseof = !_M_sbuf || _M_sbuf->sgetc() == __eof;

	bool __beof = !__b._M_sbuf

	  	      || __b._M_sbuf->sgetc() == __eof;

	return (__thiseof && __beof || (!__thiseof && !__beof));

      }

#endif

    };

  template

    inline bool

    operator==(const istreambuf_iterator<_CharT, _Traits>& __a,

	       const istreambuf_iterator<_CharT, _Traits>& __b)

    { return __a.equal(__b); }

  template

    inline bool

    operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,

	       const istreambuf_iterator<_CharT, _Traits>& __b)

    { return !__a.equal(__b); }

} // namespace std

#endif