/*

 *

 * Copyright (c) 1996,1997

 * 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_SLIST_H

#define _STLP_INTERNAL_SLIST_H

#ifndef _STLP_INTERNAL_ALGOBASE_H

#  include <stl/_algobase.h>

#endif

#ifndef _STLP_INTERNAL_ALLOC_H

#  include <stl/_alloc.h>

#endif

#ifndef _STLP_INTERNAL_ITERATOR_H

#  include <stl/_iterator.h>

#endif

#ifndef _STLP_INTERNAL_CONSTRUCT_H

#  include <stl/_construct.h>

#endif

#ifndef _STLP_INTERNAL_FUNCTION_BASE_H

#  include <stl/_function_base.h>

#endif

#ifndef _STLP_INTERNAL_SLIST_BASE_H

#  include <stl/_slist_base.h>

#endif

_STLP_BEGIN_NAMESPACE

_STLP_MOVE_TO_PRIV_NAMESPACE

template <class _Tp>

class _Slist_node : public _Slist_node_base {

public:

  _Tp _M_data;

  __TRIVIAL_STUFF(_Slist_node)

};

struct _Slist_iterator_base {

  typedef size_t               size_type;

  typedef ptrdiff_t            difference_type;

  typedef forward_iterator_tag iterator_category;

  _Slist_node_base *_M_node;

  _Slist_iterator_base(_Slist_node_base *__x) : _M_node(__x) {}

  void _M_incr() {

    _M_node = _M_node->_M_next;

  }

};

template <class _Tp, class _Traits>

class _Slist_iterator : public _Slist_iterator_base {

public:

  typedef typename _Traits::value_type value_type;

  typedef typename _Traits::pointer    pointer;

  typedef typename _Traits::reference  reference;

  typedef forward_iterator_tag iterator_category;

  typedef size_t size_type;

  typedef ptrdiff_t difference_type;

  typedef _Slist_iterator<_Tp, _Traits>         _Self;

  typedef typename _Traits::_NonConstTraits     _NonConstTraits;

  typedef _Slist_iterator<_Tp, _NonConstTraits> iterator;

  typedef typename _Traits::_ConstTraits        _ConstTraits;

  typedef _Slist_iterator<_Tp, _ConstTraits>    const_iterator;

  typedef _Slist_node<value_type> _Node;

  explicit _Slist_iterator(_Slist_node_base *__x) : _Slist_iterator_base(__x) {}

  _Slist_iterator() : _Slist_iterator_base(0) {}

  //copy constructor for iterator and constructor from iterator for const_iterator

  _Slist_iterator(const iterator& __x) : _Slist_iterator_base(__x._M_node) {}

  reference operator*() const { return __STATIC_CAST(_Node*, this->_M_node)->_M_data; }

  _STLP_DEFINE_ARROW_OPERATOR

  _Self& operator++() {

    _M_incr();

    return *this;

  }

  _Self operator++(int) {

    _Self __tmp = *this;

    _M_incr();

    return __tmp;

  }

  bool operator==(const_iterator __y ) const {

    return this->_M_node == __y._M_node;

  }

  bool operator!=(const_iterator __y ) const {

    return this->_M_node != __y._M_node;

  }

};

#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)

_STLP_MOVE_TO_STD_NAMESPACE

template <class _Tp, class _Traits>

struct __type_traits<_STLP_PRIV _Slist_iterator<_Tp, _Traits> > {

  typedef __false_type   has_trivial_default_constructor;

  typedef __true_type    has_trivial_copy_constructor;

  typedef __true_type    has_trivial_assignment_operator;

  typedef __true_type    has_trivial_destructor;

  typedef __false_type   is_POD_type;

};

_STLP_MOVE_TO_PRIV_NAMESPACE

#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */

#if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)

_STLP_MOVE_TO_STD_NAMESPACE

template <class _Tp, class _Traits>

inline _Tp* _STLP_CALL value_type(const _STLP_PRIV _Slist_iterator<_Tp, _Traits>&) { return __STATIC_CAST(_Tp*, 0); }

inline ptrdiff_t* _STLP_CALL distance_type(const _STLP_PRIV _Slist_iterator_base&) { return 0; }

inline forward_iterator_tag _STLP_CALL iterator_category(const _STLP_PRIV _Slist_iterator_base&) { return forward_iterator_tag(); }

_STLP_MOVE_TO_PRIV_NAMESPACE

#endif /* OLD_QUERIES */

// Base class that encapsulates details of allocators and simplifies EH

template <class _Tp, class _Alloc>

class _Slist_base {

protected:

  typedef _Slist_node<_Tp> _Node;

  typedef typename _Alloc_traits<_Node,_Alloc>::allocator_type _M_node_allocator_type;

  typedef _Slist_base<_Tp, _Alloc> _Self;

public:

  typedef _STLP_alloc_proxy<_Slist_node_base, _Node, _M_node_allocator_type> _AllocProxy;

  _STLP_FORCE_ALLOCATORS(_Tp, _Alloc)

  typedef typename _Alloc_traits<_Tp,_Alloc>::allocator_type allocator_type;

  _Slist_base(const allocator_type& __a) :

    _M_head(_STLP_CONVERT_ALLOCATOR(__a, _Node), _Slist_node_base() ) {

    _M_head._M_data._M_next = 0;

  }

  _Slist_base(__move_source<_Self> src) :

    _M_head(__move_source<_AllocProxy>(src.get()._M_head)) {

      src.get()._M_head._M_data._M_next = 0;

  }

  ~_Slist_base() { _M_erase_after(&_M_head._M_data, 0); }

protected:

  _Slist_node_base* _M_erase_after(_Slist_node_base* __pos) {

    _Node* __next = __STATIC_CAST(_Node*, __pos->_M_next);

    _Slist_node_base* __next_next = __next->_M_next;

    __pos->_M_next = __next_next;

    _STLP_STD::_Destroy(&__next->_M_data);

    _M_head.deallocate(__next,1);

    return __next_next;

  }

  _Slist_node_base* _M_erase_after(_Slist_node_base*, _Slist_node_base*);

public:

  allocator_type get_allocator() const

  { return _STLP_CONVERT_ALLOCATOR((const _M_node_allocator_type&)_M_head, _Tp); }

  _AllocProxy _M_head;

};

#if defined (_STLP_USE_PTR_SPECIALIZATIONS)

#  define slist _STLP_PTR_IMPL_NAME(slist)

#elif defined (_STLP_DEBUG)

#  define slist _STLP_NON_DBG_NAME(slist)

#else

_STLP_MOVE_TO_STD_NAMESPACE

#endif

template <class _Tp, _STLP_DEFAULT_ALLOCATOR_SELECT(_Tp) >

class slist;

#if !defined (slist)

_STLP_MOVE_TO_PRIV_NAMESPACE

#endif

// helper functions to reduce code duplication

template <class _Tp, class _Alloc, class _BinaryPredicate>

void _Slist_unique(slist<_Tp, _Alloc>& __that, _BinaryPredicate __binary_pred);

template <class _Tp, class _Alloc, class _StrictWeakOrdering>

void _Slist_merge(slist<_Tp, _Alloc>& __that, slist<_Tp, _Alloc>& __x,

                  _StrictWeakOrdering __comp);

template <class _Tp, class _Alloc, class _StrictWeakOrdering>

void _Slist_sort(slist<_Tp, _Alloc>& __that, _StrictWeakOrdering __comp);

#if !defined (slist)

_STLP_MOVE_TO_STD_NAMESPACE

#endif

template <class _Tp, class _Alloc>

class slist : protected _STLP_PRIV _Slist_base<_Tp,_Alloc>

#if defined (_STLP_USE_PARTIAL_SPEC_WORKAROUND) && !defined (slist)

            , public __stlport_class<slist<_Tp, _Alloc> >

#endif

{

private:

  typedef _STLP_PRIV _Slist_base<_Tp,_Alloc> _Base;

  typedef slist<_Tp,_Alloc> _Self;

public:

  typedef _Tp                value_type;

  typedef value_type*       pointer;

  typedef const value_type* const_pointer;

  typedef value_type&       reference;

  typedef const value_type& const_reference;

  typedef size_t            size_type;

  typedef ptrdiff_t         difference_type;

  typedef forward_iterator_tag _Iterator_category;

  typedef _STLP_PRIV _Slist_iterator<_Tp, _Nonconst_traits<_Tp> > iterator;

  typedef _STLP_PRIV _Slist_iterator<_Tp, _Const_traits<_Tp> >    const_iterator;

  _STLP_FORCE_ALLOCATORS(_Tp, _Alloc)

  typedef typename _Base::allocator_type allocator_type;

private:

  typedef _STLP_PRIV _Slist_node<_Tp> _Node;

  typedef _STLP_PRIV _Slist_node_base _Node_base;

#if !defined(_STLP_DONT_SUP_DFLT_PARAM)

  _Node* _M_create_node(const value_type& __x = _Tp()) {

#else

  _Node* _M_create_node(const value_type& __x) {

#endif /*_STLP_DONT_SUP_DFLT_PARAM*/

    _Node* __node = this->_M_head.allocate(1);

    _STLP_TRY {

      _Copy_Construct(&__node->_M_data, __x);

      __node->_M_next = 0;

    }

    _STLP_UNWIND(this->_M_head.deallocate(__node, 1))

    return __node;

  }

#if defined(_STLP_DONT_SUP_DFLT_PARAM)

  _Node* _M_create_node() {

    _Node* __node = this->_M_head.allocate(1);

    _STLP_TRY {

      _STLP_STD::_Construct(&__node->_M_data);

      __node->_M_next = 0;

    }

    _STLP_UNWIND(this->_M_head.deallocate(__node, 1))

    return __node;

  }

#endif /*_STLP_DONT_SUP_DFLT_PARAM*/

public:

  allocator_type get_allocator() const { return _Base::get_allocator(); }

#if !defined (_STLP_DONT_SUP_DFLT_PARAM)

  explicit slist(const allocator_type& __a = allocator_type())

#else

  slist()

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(allocator_type()) {}

  slist(const allocator_type& __a)

#endif

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(__a) {}

#if !defined (_STLP_DONT_SUP_DFLT_PARAM)

  explicit slist(size_type __n, const value_type& __x = _STLP_DEFAULT_CONSTRUCTED(_Tp),

                 const allocator_type& __a =  allocator_type())

#else

  explicit slist(size_type __n)

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(allocator_type())

    { _M_insert_after_fill(&this->_M_head._M_data, __n, _STLP_DEFAULT_CONSTRUCTED(_Tp)); }

  slist(size_type __n, const value_type& __x)

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(allocator_type())

    { _M_insert_after_fill(&this->_M_head._M_data, __n, __x); }

  slist(size_type __n, const value_type& __x, const allocator_type& __a)

#endif

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(__a)

    { _M_insert_after_fill(&this->_M_head._M_data, __n, __x); }

#if defined (_STLP_MEMBER_TEMPLATES)

  // We don't need any dispatching tricks here, because _M_insert_after_range

  // already does them.

  template <class _InputIterator>

  slist(_InputIterator __first, _InputIterator __last,

        const allocator_type& __a _STLP_ALLOCATOR_TYPE_DFL)

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(__a)

    { _M_insert_after_range(&this->_M_head._M_data, __first, __last); }

#  if defined (_STLP_NEEDS_EXTRA_TEMPLATE_CONSTRUCTORS)

  // VC++ needs this crazyness

  template <class _InputIterator>

  slist(_InputIterator __first, _InputIterator __last)

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(allocator_type())

    { _M_insert_after_range(&this->_M_head._M_data, __first, __last); }

# endif

#else /* _STLP_MEMBER_TEMPLATES */

  slist(const_iterator __first, const_iterator __last,

        const allocator_type& __a =  allocator_type() )

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(__a)

    { _M_insert_after_range(&this->_M_head._M_data, __first, __last); }

  slist(const value_type* __first, const value_type* __last,

        const allocator_type& __a =  allocator_type())

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(__a)

    { _M_insert_after_range(&this->_M_head._M_data, __first, __last); }

#endif /* _STLP_MEMBER_TEMPLATES */

  slist(const _Self& __x)

    : _STLP_PRIV _Slist_base<_Tp,_Alloc>(__x.get_allocator())

    { _M_insert_after_range(&this->_M_head._M_data, __x.begin(), __x.end()); }

  slist(__move_source<_Self> src)

    : _STLP_PRIV _Slist_base<_Tp, _Alloc>(__move_source<_Base>(src.get())) {}

  _Self& operator= (const _Self& __x);

  ~slist() {}

public:

  // assign(), a generalized assignment member function.  Two

  // versions: one that takes a count, and one that takes a range.

  // The range version is a member template, so we dispatch on whether

  // or not the type is an integer.

  void assign(size_type __n, const _Tp& __val) { _M_fill_assign(__n, __val); }

private:

  void _M_fill_assign(size_type __n, const _Tp& __val);

#if defined (_STLP_MEMBER_TEMPLATES)

public:

  template <class _InputIterator>

  void assign(_InputIterator __first, _InputIterator __last) {

    typedef typename _IsIntegral<_InputIterator>::_Ret _Integral;

    _M_assign_dispatch(__first, __last, _Integral());

  }

private:

  template <class _Integer>

  void _M_assign_dispatch(_Integer __n, _Integer __val,

                          const __true_type& /*_IsIntegral*/) {

    _M_fill_assign((size_type) __n, (_Tp) __val);

  }

  template <class _InputIter>

  void _M_assign_dispatch(_InputIter __first, _InputIter __last,

                          const __false_type& /*_IsIntegral*/) {

#else

public:

  void assign(const_pointer __first, const_pointer __last) {

    _Node_base* __prev = &this->_M_head._M_data;

    _Node_base* __node = this->_M_head._M_data._M_next;

    while (__node != 0 && __first != __last) {

      __STATIC_CAST(_Node*, __node)->_M_data = *__first;

      __prev = __node;

      __node = __node->_M_next;

      ++__first;

    }

    if (__first != __last)

      _M_insert_after_range(__prev, __first, __last);

    else

      this->_M_erase_after(__prev, 0);

  }

  void assign(const_iterator __first, const_iterator __last) {

#endif /* _STLP_MEMBER_TEMPLATES */

    _Node_base* __prev = &this->_M_head._M_data;

    _Node_base* __node = this->_M_head._M_data._M_next;

    while (__node != 0 && __first != __last) {

      __STATIC_CAST(_Node*, __node)->_M_data = *__first;

      __prev = __node;

      __node = __node->_M_next;

      ++__first;

    }

    if (__first != __last)

      _M_insert_after_range(__prev, __first, __last);

    else

      this->_M_erase_after(__prev, 0);

  }

public:

  // Experimental new feature: before_begin() returns a

  // non-dereferenceable iterator that, when incremented, yields

  // begin().  This iterator may be used as the argument to

  // insert_after, erase_after, etc.  Note that even for an empty

  // slist, before_begin() is not the same iterator as end().  It

  // is always necessary to increment before_begin() at least once to

  // obtain end().

  iterator before_begin() { return iterator(&this->_M_head._M_data); }

  const_iterator before_begin() const

    { return const_iterator(__CONST_CAST(_Node_base*, &this->_M_head._M_data)); }

  iterator begin() { return iterator(this->_M_head._M_data._M_next); }

  const_iterator begin() const

    { return const_iterator(this->_M_head._M_data._M_next);}

  iterator end() { return iterator(); }

  const_iterator end() const { return const_iterator(); }

  size_type size() const

  { return _STLP_PRIV _Sl_global_inst::size(this->_M_head._M_data._M_next); }

  size_type max_size() const { return size_type(-1); }

  bool empty() const { return this->_M_head._M_data._M_next == 0; }

  void swap(_Self& __x) {

    this->_M_head.swap(__x._M_head);

  }

public:

  reference front()             { return *begin(); }

  const_reference front() const { return *begin(); }

#if !defined (_STLP_DONT_SUP_DFLT_PARAM) && !defined (_STLP_NO_ANACHRONISMS)

  void push_front(const value_type& __x = _Tp())   {

#else

  void push_front(const value_type& __x)   {

#endif /*!_STLP_DONT_SUP_DFLT_PARAM && !_STLP_NO_ANACHRONISMS*/

    _STLP_PRIV __slist_make_link(&this->_M_head._M_data, _M_create_node(__x));

  }

#if defined (_STLP_DONT_SUP_DFLT_PARAM) && !defined (_STLP_NO_ANACHRONISMS)

  void push_front() { _STLP_PRIV __slist_make_link(&this->_M_head._M_data, _M_create_node());}

#endif /*_STLP_DONT_SUP_DFLT_PARAM && !_STLP_NO_ANACHRONISMS*/

  void pop_front() {

    _Node* __node = __STATIC_CAST(_Node*, this->_M_head._M_data._M_next);

    this->_M_head._M_data._M_next = __node->_M_next;

    _STLP_STD::_Destroy(&__node->_M_data);

    this->_M_head.deallocate(__node, 1);

  }

  iterator previous(const_iterator __pos) {

    return iterator(_STLP_PRIV _Sl_global_inst::__previous(&this->_M_head._M_data, __pos._M_node));

  }

  const_iterator previous(const_iterator __pos) const {

    return const_iterator(__CONST_CAST(_Node_base*,

                                       _STLP_PRIV _Sl_global_inst::__previous(&this->_M_head._M_data,

                                                                               __pos._M_node)));

  }

private:

#if !defined (_STLP_DONT_SUP_DFLT_PARAM)

  _Node* _M_insert_after(_Node_base* __pos, const value_type& __x = _Tp()) {

#else

  _Node* _M_insert_after(_Node_base* __pos, const value_type& __x) {

#endif /*_STLP_DONT_SUP_DFLT_PARAM*/

    return __STATIC_CAST(_Node*, _STLP_PRIV __slist_make_link(__pos, _M_create_node(__x)));

  }

#if defined (_STLP_DONT_SUP_DFLT_PARAM)

  _Node* _M_insert_after(_Node_base* __pos) {

    return __STATIC_CAST(_Node*, _STLP_PRIV __slist_make_link(__pos, _M_create_node()));

  }

#endif /*_STLP_DONT_SUP_DFLT_PARAM*/

  void _M_insert_after_fill(_Node_base* __pos,

                            size_type __n, const value_type& __x) {

    for (size_type __i = 0; __i < __n; ++__i)

      __pos = _STLP_PRIV __slist_make_link(__pos, _M_create_node(__x));

  }

#if defined (_STLP_MEMBER_TEMPLATES)

  // Check whether it's an integral type.  If so, it's not an iterator.

  template <class _InIter>

  void _M_insert_after_range(_Node_base* __pos,

                             _InIter __first, _InIter __last) {

    typedef typename _IsIntegral<_InIter>::_Ret _Integral;

    _M_insert_after_range(__pos, __first, __last, _Integral());

  }

  template <class _Integer>

  void _M_insert_after_range(_Node_base* __pos, _Integer __n, _Integer __x,

                             const __true_type&) {

    _M_insert_after_fill(__pos, __n, __x);

  }

  template <class _InIter>

  void _M_insert_after_range(_Node_base* __pos,

                             _InIter __first, _InIter __last,

                             const __false_type&) {

#else /* _STLP_MEMBER_TEMPLATES */

  void _M_insert_after_range(_Node_base* __pos,

                             const value_type* __first,

                             const value_type* __last) {

    while (__first != __last) {

      __pos = _STLP_PRIV __slist_make_link(__pos, _M_create_node(*__first));

      ++__first;

    }

  }

  void _M_insert_after_range(_Node_base* __pos,

                             const_iterator __first, const_iterator __last) {

#endif /* _STLP_MEMBER_TEMPLATES */

    while (__first != __last) {

      __pos = _STLP_PRIV __slist_make_link(__pos, _M_create_node(*__first));

      ++__first;

    }

  }

#if defined (_STLP_MEMBER_TEMPLATES)

  // Check whether it's an integral type.  If so, it's not an iterator.

  template <class _InIter>

  void _M_splice_after_range(_Node_base* __pos,

                             _InIter __first, _InIter __last) {

    typedef typename _IsIntegral<_InIter>::_Ret _Integral;

    _M_splice_after_range(__pos, __first, __last, _Integral());

  }

  template <class _Integer>