/*

 *

 * 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.

 */

#ifndef _STLP_INTERNAL_ITERATOR_BASE_H

#define _STLP_INTERNAL_ITERATOR_BASE_H

#ifndef _STLP_INTERNAL_CSTDDEF

#  include <stl/_cstddef.h>

#endif

//# if defined  (_STLP_IMPORT_VENDOR_CSTD) && ! defined (_STLP_VENDOR_GLOBAL_CSTD)

//_STLP_BEGIN_NAMESPACE

//using namespace _STLP_VENDOR_CSTD;

//_STLP_END_NAMESPACE

//#endif /* _STLP_IMPORT_VENDOR_CSTD */

#if !defined(_STLP_USE_OLD_HP_ITERATOR_QUERIES) && !defined(_STLP_CLASS_PARTIAL_SPECIALIZATION)

#  ifndef _STLP_TYPE_TRAITS_H

#    include <stl/type_traits.h>

#  endif

#endif

_STLP_BEGIN_NAMESPACE

struct input_iterator_tag {};

struct output_iterator_tag {};

struct forward_iterator_tag : public input_iterator_tag {};

struct bidirectional_iterator_tag : public forward_iterator_tag {};

struct random_access_iterator_tag : public bidirectional_iterator_tag {};

template <class _Category, class _Tp, _STLP_DFL_TMPL_PARAM(_Distance,ptrdiff_t),

          _STLP_DFL_TMPL_PARAM(_Pointer,_Tp*), _STLP_DFL_TMPL_PARAM(_Reference,_Tp&) >

struct iterator {

  typedef _Category  iterator_category;

  typedef _Tp        value_type;

  typedef _Distance  difference_type;

  typedef _Pointer   pointer;

  typedef _Reference reference;

};

_STLP_TEMPLATE_NULL

struct iterator<output_iterator_tag, void, void, void, void> {

  typedef output_iterator_tag  iterator_category;

#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION

  typedef void                value_type;

  typedef void                difference_type;

  typedef void                pointer;

  typedef void                reference;

#endif

};

#if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)

#  define _STLP_ITERATOR_CATEGORY(_It, _Tp) iterator_category(_It)

#  define _STLP_DISTANCE_TYPE(_It, _Tp)     distance_type(_It)

#  define _STLP_VALUE_TYPE(_It, _Tp)        value_type(_It)

//Old HP iterator queries do not give information about the iterator

//associated reference type so we consider that it is not a real reference.

#  define _STLP_IS_REF_TYPE_REAL_REF(_It, _Tp) __false_type()

#else

#  if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)

#    define _STLP_VALUE_TYPE(_It, _Tp)        (typename iterator_traits< _Tp >::value_type*)0

#    define _STLP_DISTANCE_TYPE(_It, _Tp)     (typename iterator_traits< _Tp >::difference_type*)0

#    if defined (__BORLANDC__) || defined (__SUNPRO_CC) || ( defined (__MWERKS__) && (__MWERKS__ <= 0x2303)) || ( defined (__sgi) && defined (_COMPILER_VERSION)) || defined (__DMC__)

#      define _STLP_ITERATOR_CATEGORY(_It, _Tp) iterator_traits< _Tp >::iterator_category()

#    else

#      define _STLP_ITERATOR_CATEGORY(_It, _Tp) typename iterator_traits< _Tp >::iterator_category()

#    endif

#    define _STLP_IS_REF_TYPE_REAL_REF(_It, _Tp) _IsRefType< typename iterator_traits< _Tp >::reference >::_Ret()

#  else

#    define _STLP_ITERATOR_CATEGORY(_It, _Tp)   __iterator_category(_It, _IsPtrType<_Tp>::_Ret())

#    define _STLP_DISTANCE_TYPE(_It, _Tp)       (ptrdiff_t*)0

#    define _STLP_VALUE_TYPE(_It, _Tp)          __value_type(_It, _IsPtrType<_Tp>::_Ret() )

#    define _STLP_IS_REF_TYPE_REAL_REF(_It, _Tp) __false_type()

#  endif

#endif

template <class _Iterator>

struct iterator_traits {

  typedef typename _Iterator::iterator_category iterator_category;

  typedef typename _Iterator::value_type        value_type;

  typedef typename _Iterator::difference_type   difference_type;

  typedef typename _Iterator::pointer           pointer;

  typedef typename _Iterator::reference         reference;

};

#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && ! defined (__SUNPRO_CC)

#  define _STLP_DIFFERENCE_TYPE(_Iterator) typename iterator_traits<_Iterator>::difference_type

#else

#  define _STLP_DIFFERENCE_TYPE(_Iterator) ptrdiff_t

#endif

#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION

// fbp : this order keeps gcc happy

template <class _Tp>

struct iterator_traits<const _Tp*> {

  typedef random_access_iterator_tag  iterator_category;

  typedef _Tp                         value_type;

  typedef ptrdiff_t                   difference_type;

  typedef const _Tp*                  pointer;

  typedef const _Tp&                  reference;

};

template <class _Tp>

struct iterator_traits<_Tp*> {

  typedef random_access_iterator_tag  iterator_category;

  typedef _Tp                         value_type;

  typedef ptrdiff_t                   difference_type;

  typedef _Tp*                        pointer;

  typedef _Tp&                        reference;

};

#  if defined (__BORLANDC__)

template <class _Tp>

struct iterator_traits<_Tp* const> {

  typedef random_access_iterator_tag  iterator_category;

  typedef _Tp                         value_type;

  typedef ptrdiff_t                   difference_type;

  typedef const _Tp*                  pointer;

  typedef const _Tp&                  reference;

};

#  endif

#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */

#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) || \

   (defined (_STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS) && ! defined (_STLP_NO_ARROW_OPERATOR))

#  define _STLP_POINTERS_SPECIALIZE( _TpP )

#  define _STLP_DEFINE_ARROW_OPERATOR  pointer operator->() const { return &(operator*()); }

#else

#  include <stl/_ptrs_specialize.h>

#endif

#ifndef _STLP_USE_OLD_HP_ITERATOR_QUERIES

// The overloaded functions iterator_category, distance_type, and

// value_type are not part of the C++ standard.  (They have been

// replaced by struct iterator_traits.)  They are included for

// backward compatibility with the HP STL.

// We introduce internal names for these functions.

#  ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION

template <class _Iter>

inline typename iterator_traits<_Iter>::iterator_category __iterator_category(const _Iter&) {

  typedef typename iterator_traits<_Iter>::iterator_category _Category;

  return _Category();

}

template <class _Iter>

inline typename iterator_traits<_Iter>::difference_type* __distance_type(const _Iter&) {

  typedef typename iterator_traits<_Iter>::difference_type _diff_type;

  return __STATIC_CAST(_diff_type*,0);

}

template <class _Iter>

inline typename iterator_traits<_Iter>::value_type* __value_type(const _Iter&) {

  typedef typename iterator_traits<_Iter>::value_type _value_type;

  return __STATIC_CAST(_value_type*,0);

}

#  else /* _STLP_CLASS_PARTIAL_SPECIALIZATION */

template <class _Iter>

inline random_access_iterator_tag

__iterator_category(const _Iter&, const __true_type&) {

  return random_access_iterator_tag();

}

template <class _Iter>

inline _STLP_TYPENAME_ON_RETURN_TYPE iterator_traits<_Iter>::iterator_category

__iterator_category(const _Iter&, const __false_type&) {

  typedef typename iterator_traits<_Iter>::iterator_category _Category;

  return _Category();

}

template <class _Iter>

inline ptrdiff_t* _STLP_CALL __distance_type(const _Iter&) { return __STATIC_CAST(ptrdiff_t*, 0); }

template <class _Iter>

inline _STLP_TYPENAME_ON_RETURN_TYPE iterator_traits<_Iter>::value_type*

__value_type(const _Iter&, const __false_type&) {

  typedef typename iterator_traits<_Iter>::value_type _value_type;

  return __STATIC_CAST(_value_type*,0);

}

template <class _Tp>

inline _Tp*

__value_type(const _Tp*, const __true_type&) {

  return __STATIC_CAST(_Tp*, 0);

}

#  endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */

#else /* _STLP_USE_OLD_HP_ITERATOR_QUERIES */

template <class _Category, class _Tp, class _Distance, class _Pointer, class _Reference>

inline _Category _STLP_CALL iterator_category(const iterator<_Category,_Tp,_Distance,_Pointer,_Reference>&) { return _Category(); }

template <class _Category, class _Tp, class _Distance, class _Pointer, class _Reference>

inline _Tp* _STLP_CALL value_type(const iterator<_Category,_Tp,_Distance,_Pointer,_Reference>&) { return __STATIC_CAST(_Tp*, 0); }

template <class _Category, class _Tp, class _Distance, class _Pointer, class _Reference>

inline _Distance* _STLP_CALL distance_type(const iterator<_Category,_Tp,_Distance,_Pointer,_Reference>&) { return __STATIC_CAST(_Distance*, 0); }

template <class _Tp>

inline random_access_iterator_tag _STLP_CALL iterator_category(const _Tp*) { return random_access_iterator_tag(); }

template <class _Tp>

inline _Tp* _STLP_CALL value_type(const _Tp*) { return __STATIC_CAST(_Tp*, 0); }

template <class _Tp>

inline ptrdiff_t* _STLP_CALL distance_type(const _Tp*) { return __STATIC_CAST(ptrdiff_t*, 0); }

#endif /* _STLP_USE_OLD_HP_ITERATOR_QUERIES */

# if ! defined (_STLP_NO_ANACHRONISMS)

// The base classes input_iterator, output_iterator, forward_iterator,

// bidirectional_iterator, and random_access_iterator are not part of

// the C++ standard.  (They have been replaced by struct iterator.)

// They are included for backward compatibility with the HP STL.

template <class _Tp, class _Distance> struct input_iterator :

  public iterator <input_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {};

struct output_iterator : public iterator <output_iterator_tag, void, void, void, void> {};

template <class _Tp, class _Distance> struct forward_iterator :

  public iterator<forward_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {};

template <class _Tp, class _Distance> struct bidirectional_iterator :

  public iterator<bidirectional_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {};

template <class _Tp, class _Distance> struct random_access_iterator :

  public iterator<random_access_iterator_tag, _Tp, _Distance, _Tp*, _Tp&> {};

# if defined (_STLP_BASE_MATCH_BUG) && defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)

template <class _Tp, class _Distance>

inline input_iterator_tag _STLP_CALL

iterator_category(const input_iterator<_Tp, _Distance>&) { return input_iterator_tag(); }

inline output_iterator_tag _STLP_CALL

iterator_category(const output_iterator&) { return output_iterator_tag(); }

template <class _Tp, class _Distance>

inline forward_iterator_tag _STLP_CALL

iterator_category(const forward_iterator<_Tp, _Distance>&) { return forward_iterator_tag(); }

template <class _Tp, class _Distance>

inline bidirectional_iterator_tag _STLP_CALL

iterator_category(const bidirectional_iterator<_Tp, _Distance>&) { return bidirectional_iterator_tag(); }

template <class _Tp, class _Distance>

inline random_access_iterator_tag _STLP_CALL

iterator_category(const random_access_iterator<_Tp, _Distance>&) { return random_access_iterator_tag(); }

template <class _Tp, class _Distance>

inline _Tp*  _STLP_CALL value_type(const input_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); }

template <class _Tp, class _Distance>

inline _Tp* _STLP_CALL value_type(const forward_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); }

template <class _Tp, class _Distance>

inline _Tp* _STLP_CALL value_type(const bidirectional_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); }

template <class _Tp, class _Distance>

inline _Tp* _STLP_CALL value_type(const random_access_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Tp*, 0); }

template <class _Tp, class _Distance>

inline _Distance* _STLP_CALL distance_type(const input_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0); }

template <class _Tp, class _Distance>

inline _Distance* _STLP_CALL distance_type(const forward_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0); }

template <class _Tp, class _Distance>

inline _Distance* _STLP_CALL distance_type(const bidirectional_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0);}

template <class _Tp, class _Distance>

inline _Distance* _STLP_CALL distance_type(const random_access_iterator<_Tp, _Distance>&) { return __STATIC_CAST(_Distance*, 0); }

# endif /* BASE_MATCH */

#endif /* _STLP_NO_ANACHRONISMS */

template <class _InputIterator, class _Distance>

inline void _STLP_CALL __distance(const _InputIterator& __first, const _InputIterator& __last,

                                  _Distance& __n, const input_iterator_tag &) {

  _InputIterator __it(__first);

  while (__it != __last) { ++__it; ++__n; }

}

# if defined (_STLP_NONTEMPL_BASE_MATCH_BUG)

template <class _ForwardIterator, class _Distance>

inline void _STLP_CALL __distance(const _ForwardIterator& __first, const _ForwardIterator& __last,

                                  _Distance& __n, const forward_iterator_tag &) {

  _ForwardIterator __it(__first);

  while (__it != __last) { ++__first; ++__n; }

}

template <class _BidirectionalIterator, class _Distance>

_STLP_INLINE_LOOP void _STLP_CALL __distance(const _BidirectionalIterator& __first,

                                             const _BidirectionalIterator& __last,

                                             _Distance& __n, const bidirectional_iterator_tag &) {

  _BidirectionalIterator __it(__first);

  while (__it != __last) { ++__it; ++__n; }

}

# endif

template <class _RandomAccessIterator, class _Distance>

inline void _STLP_CALL __distance(const _RandomAccessIterator& __first,

                                  const _RandomAccessIterator& __last,

                                  _Distance& __n, const random_access_iterator_tag &) {

  __n += __last - __first;

}

#ifndef _STLP_NO_ANACHRONISMS

template <class _InputIterator, class _Distance>

inline void _STLP_CALL distance(const _InputIterator& __first,

        const _InputIterator& __last, _Distance& __n) {

  __distance(__first, __last, __n, _STLP_ITERATOR_CATEGORY(__first, _InputIterator));

}

#endif

template <class _InputIterator>

inline _STLP_DIFFERENCE_TYPE(_InputIterator) _STLP_CALL

__distance(const _InputIterator& __first, const _InputIterator& __last, const input_iterator_tag &) {

  _STLP_DIFFERENCE_TYPE(_InputIterator) __n = 0;

  _InputIterator __it(__first);

  while (__it != __last) {

    ++__it; ++__n;

  }

  return __n;

}

# if defined (_STLP_NONTEMPL_BASE_MATCH_BUG)

template <class _ForwardIterator>

inline _STLP_DIFFERENCE_TYPE(_ForwardIterator) _STLP_CALL

__distance(const _ForwardIterator& __first, const _ForwardIterator& __last,

           const forward_iterator_tag &)

{

  _STLP_DIFFERENCE_TYPE(_ForwardIterator) __n = 0;

  _ForwardIterator __it(__first);

  while (__it != __last) {

    ++__it; ++__n;

  }

  return __n;

}

template <class _BidirectionalIterator>

_STLP_INLINE_LOOP _STLP_DIFFERENCE_TYPE(_BidirectionalIterator) _STLP_CALL

__distance(const _BidirectionalIterator& __first,

           const _BidirectionalIterator& __last,

           const bidirectional_iterator_tag &) {

  _STLP_DIFFERENCE_TYPE(_BidirectionalIterator) __n = 0;

  _BidirectionalIterator __it(__first);

  while (__it != __last) {

    ++__it; ++__n;

  }

  return __n;

}

# endif

template <class _RandomAccessIterator>

inline _STLP_DIFFERENCE_TYPE(_RandomAccessIterator) _STLP_CALL

__distance(const _RandomAccessIterator& __first, const _RandomAccessIterator& __last,

           const random_access_iterator_tag &) {

  return __last - __first;

}

template <class _InputIterator>

inline _STLP_DIFFERENCE_TYPE(_InputIterator) _STLP_CALL

distance(_InputIterator __first, _InputIterator __last) {

  return __distance(__first, __last, _STLP_ITERATOR_CATEGORY(__first, _InputIterator));

}

// fbp: those are being used for iterator/const_iterator definitions everywhere

template <class _Tp>

struct _Nonconst_traits;

template <class _Tp>

struct _Const_traits {

  typedef _Tp value_type;

  typedef const _Tp&  reference;

  typedef const _Tp*  pointer;

  typedef _Const_traits<_Tp> _ConstTraits;

  typedef _Nonconst_traits<_Tp> _NonConstTraits;

};

template <class _Tp>

struct _Nonconst_traits {

  typedef _Tp value_type;

  typedef _Tp& reference;

  typedef _Tp* pointer;

  typedef _Const_traits<_Tp> _ConstTraits;

  typedef _Nonconst_traits<_Tp> _NonConstTraits;

};

/*

 * dums: A special iterator/const_iterator traits for set and multiset for which even

 * the iterator is not mutable

 */

template <class _Tp>

struct _Nonconst_Const_traits;

template <class _Tp>

struct _Const_Const_traits {

  typedef _Tp value_type;

  typedef const _Tp&  reference;

  typedef const _Tp*  pointer;

  typedef _Const_Const_traits<_Tp> _ConstTraits;

  typedef _Nonconst_Const_traits<_Tp> _NonConstTraits;

};

template <class _Tp>

struct _Nonconst_Const_traits {

  typedef _Tp value_type;

  typedef const _Tp& reference;

  typedef const _Tp* pointer;

  typedef _Const_Const_traits<_Tp> _ConstTraits;

  typedef _Nonconst_Const_traits<_Tp> _NonConstTraits;

};

/*

 * A macro to generate a new iterator traits from one of the

 * previous one. Changing the iterator traits type make iterators

 * from different containers not comparable.

 */

#define _STLP_CREATE_ITERATOR_TRAITS_BASE(Motif, Traits)        \

template <class _Tp>                                            \

struct _##Motif;                                                \

template <class _Tp>                                            \

struct _Const##Motif : public _STLP_STD::_Const_##Traits<_Tp> {  \

  typedef _Const##Motif<_Tp> _ConstTraits;                      \

  typedef _##Motif<_Tp> _NonConstTraits;                        \

};                                                              \

template <class _Tp>                                            \

struct _##Motif : public _STLP_STD::_Nonconst_##Traits<_Tp> {    \

  typedef _Const##Motif<_Tp> _ConstTraits;                      \

  typedef _##Motif<_Tp> _NonConstTraits;                        \

};

#define _STLP_CREATE_ITERATOR_TRAITS(Motif, Traits)             \

_STLP_MOVE_TO_PRIV_NAMESPACE                                    \

_STLP_CREATE_ITERATOR_TRAITS_BASE(Motif, Traits)                \

_STLP_MOVE_TO_STD_NAMESPACE

#define _STLP_CREATE_HASH_ITERATOR_TRAITS(Motif, Traits)        \

_STLP_MOVE_TO_PRIV_NAMESPACE                                    \

_STLP_CREATE_ITERATOR_TRAITS_BASE(NonLocal##Motif, Traits)      \

_STLP_CREATE_ITERATOR_TRAITS_BASE(Local##Motif, Traits)         \

template <class _Tp>                                            \

struct _##Motif {                                               \

  typedef _ConstNonLocal##Motif<_Tp> _ConstTraits;              \

  typedef _NonLocal##Motif<_Tp> _NonConstTraits;                \

  typedef _ConstLocal##Motif<_Tp> _ConstLocalTraits;            \

  typedef _Local##Motif<_Tp> _NonConstLocalTraits;              \

};                                                              \

_STLP_MOVE_TO_STD_NAMESPACE

/*

#  if defined (_STLP_BASE_TYPEDEF_BUG)

// this workaround is needed for SunPro 4.0.1

template <class _Traits>

struct __cnst_traits_aux : private _Traits {

  typedef typename _Traits::value_type value_type;

};

#  define __TRAITS_VALUE_TYPE(_Traits) __cnst_traits_aux<_Traits>::value_type

#  else

#  define __TRAITS_VALUE_TYPE(_Traits) _Traits::value_type

#  endif

*/

#if defined (_STLP_MSVC)

// MSVC specific

template <class _InputIterator, class _Dist>

inline void  _STLP_CALL _Distance(_InputIterator __first,

                                  _InputIterator __last, _Dist& __n) {

  __distance(__first, __last, __n, _STLP_ITERATOR_CATEGORY(__first, _InputIterator));

}

#endif

template <class _InputIter, class _Distance>

_STLP_INLINE_LOOP void  _STLP_CALL

__advance(_InputIter& __i, _Distance __n, const input_iterator_tag &) {

  while (__n--) ++__i;

}

// fbp : added output iterator tag variant

template <class _InputIter, class _Distance>

_STLP_INLINE_LOOP void  _STLP_CALL

__advance(_InputIter& __i, _Distance __n, const output_iterator_tag &) {

  while (__n--) ++__i;

}

#if defined (_STLP_NONTEMPL_BASE_MATCH_BUG)

template <class _ForwardIterator, class _Distance>

_STLP_INLINE_LOOP void _STLP_CALL

__advance(_ForwardIterator& i, _Distance n, const forward_iterator_tag &) {

  while (n--) ++i;

}

#endif

template <class _BidirectionalIterator, class _Distance>

_STLP_INLINE_LOOP void _STLP_CALL

__advance(_BidirectionalIterator& __i, _Distance __n,

          const bidirectional_iterator_tag &) {

  if (__n > 0)

    while (__n--) ++__i;

  else

    while (__n++) --__i;

}

template <class _RandomAccessIterator, class _Distance>

inline void _STLP_CALL

__advance(_RandomAccessIterator& __i, _Distance __n,

          const random_access_iterator_tag &) {

  __i += __n;

}

template <class _InputIterator, class _Distance>

inline void _STLP_CALL advance(_InputIterator& __i, _Distance __n) {

  __advance(__i, __n, _STLP_ITERATOR_CATEGORY(__i, _InputIterator));

}