/*

 *

 * Copyright (c) 1994

 * Hewlett-Packard Company

 *

 * Copyright (c) 1996-1998

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1997

 * Moscow Center for SPARC Technology

 *

 * Copyright (c) 1999

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 */

/* NOTE: This is an internal header file, included by other STL headers.

 *   You should not attempt to use it directly.

 */

#if !defined (_STLP_INTERNAL_STREAM_ITERATOR_H) && !defined (_STLP_USE_NO_IOSTREAMS)

#define _STLP_INTERNAL_STREAM_ITERATOR_H

#ifndef _STLP_INTERNAL_ITERATOR_BASE_H

#  include <stl/_iterator_base.h>

#endif

// streambuf_iterators predeclarations must appear first

#ifndef _STLP_IOSFWD

#  include <iosfwd>

#endif

#ifndef _STLP_INTERNAL_ALGOBASE_H

#  include <stl/_algobase.h>

#endif

#ifndef _STLP_INTERNAL_OSTREAMBUF_ITERATOR_H

#  include <stl/_ostreambuf_iterator.h>

#endif

#ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H

#  include <stl/_istreambuf_iterator.h>

#endif

#ifndef _STLP_INTERNAL_ISTREAM

#  include <stl/_istream.h>

#endif

// istream_iterator and ostream_iterator look very different if we're

// using new, templatized iostreams than if we're using the old cfront

// version.

_STLP_BEGIN_NAMESPACE

#if !defined (_STLP_LIMITED_DEFAULT_TEMPLATES)

#  define __ISI_TMPL_HEADER_ARGUMENTS class _Tp, class _CharT, class _Traits, class _Dist

#  define __ISI_TMPL_ARGUMENTS _Tp, _CharT, _Traits, _Dist

template <class _Tp,

          class _CharT = _STLP_DEFAULTCHAR, class _Traits = char_traits<_CharT>,

          class _Dist = ptrdiff_t>

class istream_iterator : public iterator<input_iterator_tag, _Tp , _Dist,

                                         const _Tp*, const _Tp& > {

#else

#  if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)

#    define __ISI_TMPL_HEADER_ARGUMENTS class _Tp

#    define __ISI_TMPL_ARGUMENTS        _Tp

template <class _Tp>

class istream_iterator : public iterator<input_iterator_tag, _Tp , ptrdiff_t,

                                         const _Tp*, const _Tp& > {

#  else

#    define __ISI_TMPL_HEADER_ARGUMENTS class _Tp, class _Dist

#    define __ISI_TMPL_ARGUMENTS        _Tp, _Dist

template <class _Tp, _STLP_DFL_TYPE_PARAM(_Dist, ptrdiff_t)>

class istream_iterator : public iterator<input_iterator_tag, _Tp, _Dist ,

                                         const _Tp*, const _Tp& > {

#  endif /* _STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS */

#endif /* _STLP_LIMITED_DEFAULT_TEMPLATES */

#if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)

  typedef char _CharT;

  typedef char_traits<char> _Traits;

#  if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)

  typedef ptrdiff_t _Dist;

#  endif

#endif

  typedef istream_iterator< __ISI_TMPL_ARGUMENTS > _Self;

public:

  typedef _CharT                         char_type;

  typedef _Traits                        traits_type;

  typedef basic_istream<_CharT, _Traits> istream_type;

  typedef input_iterator_tag             iterator_category;

  typedef _Tp                            value_type;

  typedef _Dist                          difference_type;

  typedef const _Tp*                     pointer;

  typedef const _Tp&                     reference;

  istream_iterator() : _M_stream(0), _M_ok(false), _M_read_done(true) {}

  istream_iterator(istream_type& __s) : _M_stream(&__s), _M_ok(false), _M_read_done(false) {}

  reference operator*() const {

    if (!_M_read_done) {

      _M_read();

    }

    return _M_value;

  }

  _STLP_DEFINE_ARROW_OPERATOR

  _Self& operator++() {

    _M_read();

    return *this;

  }

  _Self operator++(int)  {

    _Self __tmp = *this;

    _M_read();

    return __tmp;

  }

  bool _M_equal(const _Self& __x) const {

    if (!_M_read_done) {

      _M_read();

    }

    if (!__x._M_read_done) {

      __x._M_read();

    }

    return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream);

  }

private:

  istream_type* _M_stream;

  mutable _Tp _M_value;

  mutable bool _M_ok;

  mutable bool _M_read_done;

  void _M_read() const {

    _M_ok = ((_M_stream != 0) && !_M_stream->fail());

    if (_M_ok) {

      *_M_stream >> _M_value;

      _M_ok = !_M_stream->fail();

    }

    _M_read_done = true;

  }

};

#if !defined (_STLP_LIMITED_DEFAULT_TEMPLATES)

template <class _TpP,

          class _CharT = _STLP_DEFAULTCHAR, class _Traits = char_traits<_CharT> >

#else

template <class _TpP>

#endif

class ostream_iterator: public iterator<output_iterator_tag, void, void, void, void> {

#if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)

  typedef char _CharT;

  typedef char_traits<char> _Traits;

  typedef ostream_iterator<_TpP> _Self;

#else

  typedef ostream_iterator<_TpP, _CharT, _Traits> _Self;

#endif

public:

  typedef _CharT                         char_type;

  typedef _Traits                        traits_type;

  typedef basic_ostream<_CharT, _Traits> ostream_type;

  typedef output_iterator_tag            iterator_category;

  ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}

  ostream_iterator(ostream_type& __s, const _CharT* __c)

    : _M_stream(&__s), _M_string(__c)  {}

  _Self& operator=(const _TpP& __val) {

    *_M_stream << __val;

    if (_M_string) *_M_stream << _M_string;

    return *this;

  }

  _Self& operator*() { return *this; }

  _Self& operator++() { return *this; }

  _Self& operator++(int) { return *this; }

private:

  ostream_type* _M_stream;

  const _CharT* _M_string;

};

#if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)

#  if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)

template <class _TpP>

inline output_iterator_tag _STLP_CALL

iterator_category(const ostream_iterator<_TpP>&) { return output_iterator_tag(); }

#  else

template <class _TpP, class _CharT, class _Traits>

inline output_iterator_tag _STLP_CALL

iterator_category(const ostream_iterator<_TpP, _CharT, _Traits>&) { return output_iterator_tag(); }

#  endif

#endif

_STLP_END_NAMESPACE

// form-independent definiotion of stream iterators

_STLP_BEGIN_NAMESPACE

template < __ISI_TMPL_HEADER_ARGUMENTS >

inline bool _STLP_CALL

operator==(const istream_iterator< __ISI_TMPL_ARGUMENTS >& __x,

           const istream_iterator< __ISI_TMPL_ARGUMENTS >& __y)

{ return __x._M_equal(__y); }

#if defined (_STLP_USE_SEPARATE_RELOPS_NAMESPACE)

template < __ISI_TMPL_HEADER_ARGUMENTS >

inline bool _STLP_CALL

operator!=(const istream_iterator< __ISI_TMPL_ARGUMENTS >& __x,

           const istream_iterator< __ISI_TMPL_ARGUMENTS >& __y)

{ return !__x._M_equal(__y); }

#endif

#if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)

template < __ISI_TMPL_HEADER_ARGUMENTS >

inline input_iterator_tag _STLP_CALL

iterator_category(const istream_iterator< __ISI_TMPL_ARGUMENTS >&)

{ return input_iterator_tag(); }

template < __ISI_TMPL_HEADER_ARGUMENTS >

inline _Tp* _STLP_CALL

value_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (_Tp*) 0; }

#  if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)

template < __ISI_TMPL_HEADER_ARGUMENTS >

inline ptrdiff_t* _STLP_CALL

distance_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (ptrdiff_t*)0; }

#  else

template < __ISI_TMPL_HEADER_ARGUMENTS >

inline _Dist* _STLP_CALL

distance_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (_Dist*)0; }

#  endif /* _STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS */

#endif

_STLP_END_NAMESPACE

#undef __ISI_TMPL_HEADER_ARGUMENTS

#undef __ISI_TMPL_ARGUMENTS

#endif /* _STLP_INTERNAL_STREAM_ITERATOR_H */

// Local Variables:

// mode:C++

// End: