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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2004-2015. Distributed under the Boost
 // Software License, Version 1.0. (See accompanying file
 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 // See http://www.boost.org/libs/container for documentation.
 //
 //////////////////////////////////////////////////////////////////////////////
 
 #ifndef BOOST_CONTAINER_SLIST_HPP
 #define BOOST_CONTAINER_SLIST_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/container/detail/config_begin.hpp>
 #include <boost/container/detail/workaround.hpp>
 
 // container
 #include <boost/container/container_fwd.hpp>
 #include <boost/container/new_allocator.hpp> //new_allocator
 #include <boost/container/throw_exception.hpp>
 // container/detail
 #include <boost/container/detail/algorithm.hpp> //algo_equal(), algo_lexicographical_compare
 #include <boost/container/detail/compare_functors.hpp>
 #include <boost/container/detail/iterator.hpp>
 #include <boost/container/detail/iterators.hpp>
 #include <boost/container/detail/mpl.hpp>
 #include <boost/container/detail/node_alloc_holder.hpp>
 #include <boost/container/detail/type_traits.hpp>
 #include <boost/container/detail/value_functors.hpp>
 // intrusive
 #include <boost/intrusive/pointer_traits.hpp>
 #include <boost/intrusive/slist.hpp>
 // move
 #include <boost/move/iterator.hpp>
 #include <boost/move/traits.hpp>
 #include <boost/move/utility_core.hpp>
 // move/detail
 #if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 #include <boost/move/detail/fwd_macros.hpp>
 #endif
 #include <boost/move/detail/move_helpers.hpp>
 #include <boost/move/detail/force_ptr.hpp>
 // std
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
 #include <initializer_list>
 #endif
 
 namespace boost {
 namespace container {
 
 #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
 template <class T, class Allocator>
 class slist;
 
 namespace dtl {
 
 template<class VoidPointer>
 struct slist_hook
 {
    typedef typename dtl::bi::make_slist_base_hook
       <dtl::bi::void_pointer<VoidPointer>, dtl::bi::link_mode<dtl::bi::normal_link> >::type type;
 };
 
 template <class T, class VoidPointer>
 struct iiterator_node_value_type< base_node<T, slist_hook<VoidPointer> > >
 {
   typedef T type;
 };
 
 template<class Allocator>
 struct intrusive_slist_type
 {
    typedef boost::container::allocator_traits<Allocator>      allocator_traits_type;
    typedef typename allocator_traits_type::value_type value_type;
    typedef typename boost::intrusive::pointer_traits
       <typename allocator_traits_type::pointer>::template
          rebind_pointer<void>::type
             void_pointer;
    typedef base_node<value_type, slist_hook<void_pointer> > node_type;
 
    typedef typename dtl::bi::make_slist
       <node_type
       ,dtl::bi::base_hook<typename slist_hook<void_pointer>::type>
       ,dtl::bi::constant_time_size<true>
       , dtl::bi::size_type
          <typename allocator_traits_type::size_type>
       >::type                                   container_type;
    typedef container_type                       type ;
 };
 
 }  //namespace dtl {
 
 #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
 //! An slist is a singly linked list: a list where each element is linked to the next
 //! element, but not to the previous element. That is, it is a Sequence that
 //! supports forward but not backward traversal, and (amortized) constant time
 //! insertion and removal of elements. Slists, like lists, have the important
 //! property that insertion and splicing do not invalidate iterators to list elements,
 //! and that even removal invalidates only the iterators that point to the elements
 //! that are removed. The ordering of iterators may be changed (that is,
 //! slist<T>::iterator might have a different predecessor or successor after a list
 //! operation than it did before), but the iterators themselves will not be invalidated
 //! or made to point to different elements unless that invalidation or mutation is explicit.
 //!
 //! The main difference between slist and list is that list's iterators are bidirectional
 //! iterators, while slist's iterators are forward iterators. This means that slist is
 //! less versatile than list; frequently, however, bidirectional iterators are
 //! unnecessary. You should usually use slist unless you actually need the extra
 //! functionality of list, because singly linked lists are smaller and faster than double
 //! linked lists.
 //!
 //! Important performance note: like every other Sequence, slist defines the member
 //! functions insert and erase. Using these member functions carelessly, however, can
 //! result in disastrously slow programs. The problem is that insert's first argument is
 //! an iterator p, and that it inserts the new element(s) before p. This means that
 //! insert must find the iterator just before p; this is a constant-time operation
 //! for list, since list has bidirectional iterators, but for slist it must find that
 //! iterator by traversing the list from the beginning up to p. In other words:
 //! insert and erase are slow operations anywhere but near the beginning of the slist.
 //!
 //! Slist provides the member functions insert_after and erase_after, which are constant
 //! time operations: you should always use insert_after and erase_after whenever
 //! possible. If you find that insert_after and erase_after aren't adequate for your
 //! needs, and that you often need to use insert and erase in the middle of the list,
 //! then you should probably use list instead of slist.
 //!
 //! \tparam T The type of object that is stored in the list
 //! \tparam Allocator The allocator used for all internal memory management, use void
 //!   for the default allocator
 #ifdef BOOST_CONTAINER_DOXYGEN_INVOKED
 template <class T, class Allocator = void >
 #else
 template <class T, class Allocator>
 #endif
 class slist
    : protected dtl::node_alloc_holder
       < typename real_allocator<T, Allocator>::type
       , typename dtl::intrusive_slist_type<typename real_allocator<T, Allocator>::type>::type>
 {
    #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
    typedef typename real_allocator<T, Allocator>::type      ValueAllocator;
    typedef typename
       dtl::intrusive_slist_type<ValueAllocator>::type       Icont;
    typedef dtl::node_alloc_holder<ValueAllocator, Icont>    AllocHolder;
    typedef typename AllocHolder::NodePtr                    NodePtr;
    typedef typename AllocHolder::NodeAlloc                  NodeAlloc;
    typedef typename AllocHolder::ValAlloc                   ValAlloc;
    typedef typename AllocHolder::Node                       Node;
    typedef dtl::allocator_node_destroyer<NodeAlloc> Destroyer;
    typedef typename AllocHolder::alloc_version              alloc_version;
    typedef boost::container::
       allocator_traits<ValueAllocator>                           allocator_traits_type;
    typedef boost::container::equal_to_value
       <typename allocator_traits_type::value_type>          equal_to_value_type;
 
    BOOST_COPYABLE_AND_MOVABLE(slist)
    typedef dtl::iterator_from_iiterator<typename Icont::iterator, false>  iterator_impl;
    typedef dtl::iterator_from_iiterator<typename Icont::iterator, true >  const_iterator_impl;
    #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
    public:
    //////////////////////////////////////////////
    //
    //                    types
    //
    //////////////////////////////////////////////
 
    typedef T                                                                  value_type;
    typedef typename ::boost::container::allocator_traits<ValueAllocator>::pointer          pointer;
    typedef typename ::boost::container::allocator_traits<ValueAllocator>::const_pointer    const_pointer;
    typedef typename ::boost::container::allocator_traits<ValueAllocator>::reference        reference;
    typedef typename ::boost::container::allocator_traits<ValueAllocator>::const_reference  const_reference;
    typedef typename ::boost::container::allocator_traits<ValueAllocator>::size_type        size_type;
    typedef typename ::boost::container::allocator_traits<ValueAllocator>::difference_type  difference_type;
    typedef ValueAllocator                                                                  allocator_type;
    typedef BOOST_CONTAINER_IMPDEF(NodeAlloc)                                  stored_allocator_type;
    typedef BOOST_CONTAINER_IMPDEF(iterator_impl)                              iterator;
    typedef BOOST_CONTAINER_IMPDEF(const_iterator_impl)                        const_iterator;
 
    public:
 
    //////////////////////////////////////////////
    //
    //          constructFr/copy/destroy
    //
    //////////////////////////////////////////////
 
    //! <b>Effects</b>: Constructs a list taking the allocator as parameter.
    //!
    //! <b>Throws</b>: If allocator_type's copy constructor throws.
    //!
    //! <b>Complexity</b>: Constant.
    slist() BOOST_NOEXCEPT_IF(dtl::is_nothrow_default_constructible<ValueAllocator>::value)
       :  AllocHolder()
    {}
 
    //! <b>Effects</b>: Constructs a list taking the allocator as parameter.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    explicit slist(const allocator_type& a) BOOST_NOEXCEPT_OR_NOTHROW
       :  AllocHolder(a)
    {}
 
    //! <b>Effects</b>: Constructs a list
    //!   and inserts n value-initialized value_types.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!   throws or T's default or copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to n.
    explicit slist(size_type n)
       :  AllocHolder(allocator_type())
    { this->resize(n); }
 
    //! <b>Effects</b>: Constructs a list that will use a copy of allocator a
    //!   and inserts n copies of value.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!   throws or T's default or copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to n.
    slist(size_type n, const allocator_type &a)
       : AllocHolder(a)
    {  this->resize(n);  }
 
    //! <b>Effects</b>: Constructs a list that will use a copy of allocator a
    //!   and inserts n copies of value.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!   throws or T's default or copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to n.
    explicit slist(size_type n, const value_type& x, const allocator_type& a = allocator_type())
       :  AllocHolder(a)
    { this->insert_after(this->cbefore_begin(), n, x); }
 
    //! <b>Effects</b>: Constructs a list that will use a copy of allocator a
    //!   and inserts a copy of the range [first, last) in the list.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!   throws or T's constructor taking a dereferenced InIt throws.
    //!
    //! <b>Complexity</b>: Linear to the range [first, last).
    template <class InpIt>
    slist(InpIt first, InpIt last, const allocator_type& a =  allocator_type())
       : AllocHolder(a)
    { this->insert_after(this->cbefore_begin(), first, last); }
 
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    //! <b>Effects</b>: Constructs a list that will use a copy of allocator a
    //!   and inserts a copy of the range [il.begin(), il.end()) in the list.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!   throws or T's constructor taking a dereferenced std::initializer_list iterator throws.
    //!
    //! <b>Complexity</b>: Linear to the range [il.begin(), il.end()).
    slist(std::initializer_list<value_type> il, const allocator_type& a = allocator_type())
       : AllocHolder(a)
    { this->insert_after(this->cbefore_begin(), il.begin(), il.end()); }
 #endif
 
     //! <b>Effects</b>: Copy constructs a list.
    //!
    //! <b>Postcondition</b>: x == *this.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!
    //! <b>Complexity</b>: Linear to the elements x contains.
    slist(const slist& x)
       : AllocHolder(x)
    { this->insert_after(this->cbefore_begin(), x.begin(), x.end()); }
 
    //! <b>Effects</b>: Move constructor. Moves x's resources to *this.
    //!
    //! <b>Throws</b>: If allocator_type's copy constructor throws.
    //!
    //! <b>Complexity</b>: Constant.
    slist(BOOST_RV_REF(slist) x) BOOST_NOEXCEPT_OR_NOTHROW
       : AllocHolder(BOOST_MOVE_BASE(AllocHolder, x))
    {}
 
    //! <b>Effects</b>: Copy constructs a list using the specified allocator.
    //!
    //! <b>Postcondition</b>: x == *this.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor
    //!
    //! <b>Complexity</b>: Linear to the elements x contains.
    slist(const slist& x, const allocator_type &a)
       : AllocHolder(a)
    { this->insert_after(this->cbefore_begin(), x.begin(), x.end()); }
 
    //! <b>Effects</b>: Move constructor using the specified allocator.
    //!                 Moves x's resources to *this.
    //!
    //! <b>Throws</b>: If allocation or value_type's copy constructor throws.
    //!
    //! <b>Complexity</b>: Constant if a == x.get_allocator(), linear otherwise.
    slist(BOOST_RV_REF(slist) x, const allocator_type &a)
       : AllocHolder(a)
    {
       slist & sr = x;
       if(this->node_alloc() == sr.node_alloc()){
          this->icont().swap(sr.icont());
       }
       else{
          this->insert_after(this->cbefore_begin(), boost::make_move_iterator(sr.begin()), boost::make_move_iterator(sr.end()));
       }
    }
 
    //! <b>Effects</b>: Destroys the list. All stored values are destroyed
    //!   and used memory is deallocated.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of elements.
    ~slist() BOOST_NOEXCEPT_OR_NOTHROW
    {} //AllocHolder clears the slist
 
    //! <b>Effects</b>: Makes *this contain the same elements as x.
    //!
    //! <b>Postcondition</b>: this->size() == x.size(). *this contains a copy
    //! of each of x's elements.
    //!
    //! <b>Throws</b>: If memory allocation throws or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the number of elements in x.
    slist& operator= (BOOST_COPY_ASSIGN_REF(slist) x)
    {
       if (BOOST_LIKELY(this != &x)) {
          NodeAlloc &this_alloc     = this->node_alloc();
          const NodeAlloc &x_alloc  = x.node_alloc();
          dtl::bool_<allocator_traits_type::
             propagate_on_container_copy_assignment::value> flag;
          if(flag && this_alloc != x_alloc){
             this->clear();
          }
          this->AllocHolder::copy_assign_alloc(x);
          this->assign(x.begin(), x.end());
       }
       return *this;
    }
 
    //! <b>Effects</b>: Makes *this contain the same elements as x.
    //!
    //! <b>Postcondition</b>: this->size() == x.size(). *this contains a copy
    //! of each of x's elements.
    //!
    //! <b>Throws</b>: If allocator_traits_type::propagate_on_container_move_assignment
    //!   is false and (allocation throws or value_type's move constructor throws)
    //!
    //! <b>Complexity</b>: Constant if allocator_traits_type::
    //!   propagate_on_container_move_assignment is true or
    //!   this->get>allocator() == x.get_allocator(). Linear otherwise.
    slist& operator=(BOOST_RV_REF(slist) x)
       BOOST_NOEXCEPT_IF(allocator_traits_type::propagate_on_container_move_assignment::value
                                   || allocator_traits_type::is_always_equal::value)
    {
       slist & sr = x;
       if (BOOST_LIKELY(this != &sr)) {
          NodeAlloc &this_alloc = this->node_alloc();
          NodeAlloc &x_alloc    = sr.node_alloc();
          const bool propagate_alloc = allocator_traits_type::
                propagate_on_container_move_assignment::value;
          const bool allocators_equal = this_alloc == x_alloc; (void)allocators_equal;
          //Resources can be transferred if both allocators are
          //going to be equal after this function (either propagated or already equal)
          if(propagate_alloc || allocators_equal){
             //Destroy
             this->clear();
             //Move allocator if needed
             this->AllocHolder::move_assign_alloc(sr);
             //Obtain resources
             this->icont() = boost::move(sr.icont());
          }
          //Else do a one by one move
          else{
             this->assign( boost::make_move_iterator(sr.begin())
                         , boost::make_move_iterator(sr.end()));
          }
       }
       return *this;
    }
 
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    //! <b>Effects</b>: Makes *this contain the same elements as in il.
    //!
    //! <b>Postcondition</b>: this->size() == il.size(). *this contains a copy
    //! of each of il's elements.
    //!
    //! <b>Throws</b>: If allocator_traits_type::propagate_on_container_move_assignment
    //!   is false and (allocation throws or value_type's move constructor throws)
    slist& operator=(std::initializer_list<value_type> il)
    {
        assign(il.begin(), il.end());
        return *this;
    }
 #endif
 
    //! <b>Effects</b>: Assigns the n copies of val to *this.
    //!
    //! <b>Throws</b>: If memory allocation throws or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to n.
    void assign(size_type n, const T& val)
    {
       typedef constant_iterator<value_type> cvalue_iterator;
       return this->assign(cvalue_iterator(val, n), cvalue_iterator());
    }
 
    //! <b>Effects</b>: Assigns the range [first, last) to *this.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's constructor from dereferencing InpIt throws.
    //!
    //! <b>Complexity</b>: Linear to n.
    template <class InpIt>
    void assign(InpIt first, InpIt last
       #if !defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
       , typename dtl::disable_if_convertible<InpIt, size_type>::type * = 0
       #endif
       )
    {
       iterator end_n(this->end());
       iterator prev(this->before_begin());
       iterator node(this->begin());
       while (node != end_n && first != last){
          *node = *first;
          prev = node;
          ++node;
          ++first;
       }
       if (first != last)
          this->insert_after(prev, first, last);
       else
          this->erase_after(prev, end_n);
    }
 
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    //! <b>Effects</b>: Assigns the range [il.begin(), il.end()) to *this.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's constructor from dereferencing std::initializer_list iterator throws.
    //!
    //! <b>Complexity</b>: Linear to range [il.begin(), il.end()).
 
    void assign(std::initializer_list<value_type> il)
    {
        assign(il.begin(), il.end());
    }
 #endif
    //! <b>Effects</b>: Returns a copy of the internal allocator.
    //!
    //! <b>Throws</b>: If allocator's copy constructor throws.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       allocator_type get_allocator() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return allocator_type(this->node_alloc()); }
 
    //! <b>Effects</b>: Returns a reference to the internal allocator.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Non-standard extension.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       stored_allocator_type &get_stored_allocator() BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->node_alloc(); }
 
    //! <b>Effects</b>: Returns a reference to the internal allocator.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Non-standard extension.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const stored_allocator_type &get_stored_allocator() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->node_alloc(); }
 
    //////////////////////////////////////////////
    //
    //                iterators
    //
    //////////////////////////////////////////////
 
    //! <b>Effects</b>: Returns a non-dereferenceable iterator that,
    //! when incremented, yields begin().  This iterator may be used
    //! as the argument to insert_after, erase_after, etc.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       iterator before_begin() BOOST_NOEXCEPT_OR_NOTHROW
    {  return iterator(end());  }
 
    //! <b>Effects</b>: Returns a non-dereferenceable const_iterator
    //! that, when incremented, yields begin().  This iterator may be used
    //! as the argument to insert_after, erase_after, etc.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator before_begin() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->cbefore_begin();  }
 
    //! <b>Effects</b>: Returns an iterator to the first element contained in the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       iterator begin() BOOST_NOEXCEPT_OR_NOTHROW
    { return iterator(this->icont().begin()); }
 
    //! <b>Effects</b>: Returns a const_iterator to the first element contained in the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator begin() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->cbegin();   }
 
    //! <b>Effects</b>: Returns an iterator to the end of the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       iterator end() BOOST_NOEXCEPT_OR_NOTHROW
    { return iterator(this->icont().end()); }
 
    //! <b>Effects</b>: Returns a const_iterator to the end of the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator end() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->cend();   }
 
    //! <b>Effects</b>: Returns a non-dereferenceable const_iterator
    //! that, when incremented, yields begin().  This iterator may be used
    //! as the argument to insert_after, erase_after, etc.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator cbefore_begin() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return const_iterator(end());  }
 
    //! <b>Effects</b>: Returns a const_iterator to the first element contained in the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator cbegin() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return const_iterator(this->non_const_icont().begin());   }
 
    //! <b>Effects</b>: Returns a const_iterator to the end of the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator cend() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return const_iterator(this->non_const_icont().end());   }
 
    //! <b>Returns</b>: The iterator to the element before i in the sequence.
    //!   Returns the end-iterator, if either i is the begin-iterator or the
    //!   sequence is empty.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of elements before i.
    //!
    //! <b>Note</b>: Non-standard extension.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       iterator previous(iterator p) BOOST_NOEXCEPT_OR_NOTHROW
    {  return iterator(this->icont().previous(p.get())); }
 
    //! <b>Returns</b>: The const_iterator to the element before i in the sequence.
    //!   Returns the end-const_iterator, if either i is the begin-const_iterator or
    //!   the sequence is empty.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of elements before i.
    //!
    //! <b>Note</b>: Non-standard extension.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_iterator previous(const_iterator p)
    {  return const_iterator(this->icont().previous(p.get())); }
 
    //////////////////////////////////////////////
    //
    //                capacity
    //
    //////////////////////////////////////////////
 
    //! <b>Effects</b>: Returns true if the list contains no elements.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       bool empty() const
    {  return !this->size();   }
 
    //! <b>Effects</b>: Returns the number of the elements contained in the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       size_type size() const
    {  return this->icont().size(); }
 
    //! <b>Effects</b>: Returns the largest possible size of the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       size_type max_size() const
    {  return AllocHolder::max_size();  }
 
    //! <b>Effects</b>: Inserts or erases elements at the end such that
    //!   the size becomes n. New elements are value initialized.
    //!
    //! <b>Throws</b>: If memory allocation throws, or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the difference between size() and new_size.
    void resize(size_type new_size)
    {
       const_iterator last_pos;
       if(!priv_try_shrink(new_size, last_pos)){
          typedef value_init_construct_iterator<value_type> value_init_iterator;
          this->insert_after(last_pos, value_init_iterator(new_size - this->size()), value_init_iterator());
       }
    }
 
    //! <b>Effects</b>: Inserts or erases elements at the end such that
    //!   the size becomes n. New elements are copy constructed from x.
    //!
    //! <b>Throws</b>: If memory allocation throws, or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the difference between size() and new_size.
    void resize(size_type new_size, const T& x)
    {
       const_iterator last_pos;
       if(!priv_try_shrink(new_size, last_pos)){
          this->insert_after(last_pos, new_size, x);
       }
    }
 
    //////////////////////////////////////////////
    //
    //               element access
    //
    //////////////////////////////////////////////
 
    //! <b>Requires</b>: !empty()
    //!
    //! <b>Effects</b>: Returns a reference to the first element
    //!   from the beginning of the container.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       reference front()
    {
       BOOST_ASSERT(!this->empty());
       return *this->begin();
    }
 
    //! <b>Requires</b>: !empty()
    //!
    //! <b>Effects</b>: Returns a const reference to the first element
    //!   from the beginning of the container.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_reference front() const
    {
       BOOST_ASSERT(!this->empty());
       return *this->begin();
    }
 
    //////////////////////////////////////////////
    //
    //                modifiers
    //
    //////////////////////////////////////////////
 
    #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
 
    //! <b>Effects</b>: Inserts an object of type T constructed with
    //!   std::forward<Args>(args)... in the front of the list
    //!
    //! <b>Returns</b>: A reference to the created object.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    template <class... Args>
    reference emplace_front(BOOST_FWD_REF(Args)... args)
    {  return *this->emplace_after(this->cbefore_begin(), boost::forward<Args>(args)...); }
 
    //! <b>Effects</b>: Inserts an object of type T constructed with
    //!   std::forward<Args>(args)... after prev
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's in-place constructor throws.
    //!
    //! <b>Complexity</b>: Constant
    template <class... Args>
    iterator emplace_after(const_iterator prev, BOOST_FWD_REF(Args)... args)
    {
       NodePtr pnode(AllocHolder::create_node(boost::forward<Args>(args)...));
       return iterator(this->icont().insert_after(prev.get(), *pnode));
    }
 
    #else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 
    #define BOOST_CONTAINER_SLIST_EMPLACE_CODE(N) \
    BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
    reference emplace_front(BOOST_MOVE_UREF##N)\
    {  return *this->emplace_after(this->cbefore_begin() BOOST_MOVE_I##N BOOST_MOVE_FWD##N);}\
    \
    BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
    iterator emplace_after(const_iterator p BOOST_MOVE_I##N BOOST_MOVE_UREF##N)\
    {\
       NodePtr pnode (AllocHolder::create_node(BOOST_MOVE_FWD##N));\
       return iterator(this->icont().insert_after(p.get(), *pnode));\
    }\
    //
    BOOST_MOVE_ITERATE_0TO9(BOOST_CONTAINER_SLIST_EMPLACE_CODE)
    #undef BOOST_CONTAINER_SLIST_EMPLACE_CODE
 
    #endif   // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 
    #if defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
    //! <b>Effects</b>: Inserts a copy of x at the beginning of the list.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    void push_front(const T &x);
 
    //! <b>Effects</b>: Constructs a new element in the beginning of the list
    //!   and moves the resources of x to this new element.
    //!
    //! <b>Throws</b>: If memory allocation throws.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    void push_front(T &&x);
    #else
    BOOST_MOVE_CONVERSION_AWARE_CATCH(push_front, T, void, priv_push_front)
    #endif
 
 
    #if defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Inserts a copy of the value after prev_p.
    //!
    //! <b>Returns</b>: An iterator to the inserted element.
    //!
    //! <b>Throws</b>: If memory allocation throws or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references of
    //!   previous values.
    iterator insert_after(const_iterator prev_p, const T &x);
 
    //! <b>Requires</b>: prev_p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Inserts a move constructed copy object from the value after the
    //!    element pointed by prev_p.
    //!
    //! <b>Returns</b>: An iterator to the inserted element.
    //!
    //! <b>Throws</b>: If memory allocation throws.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references of
    //!   previous values.
    iterator insert_after(const_iterator prev_p, T &&x);
    #else
    BOOST_MOVE_CONVERSION_AWARE_CATCH_1ARG(insert_after, T, iterator, priv_insert_after, const_iterator, const_iterator)
    #endif
 
    //! <b>Requires</b>: prev_p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Inserts n copies of x after prev_p.
    //!
    //! <b>Returns</b>: an iterator to the last inserted element or prev_p if n is 0.
    //!
    //! <b>Throws</b>: If memory allocation throws or T's copy constructor throws.
    //!
    //!
    //! <b>Complexity</b>: Linear to n.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references of
    //!   previous values.
    iterator insert_after(const_iterator prev_p, size_type n, const value_type& x)
    {
       typedef constant_iterator<value_type> cvalue_iterator;
       return this->insert_after(prev_p, cvalue_iterator(x, n), cvalue_iterator());
    }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Inserts the range pointed by [first, last) after prev_p.
    //!
    //! <b>Returns</b>: an iterator to the last inserted element or prev_p if first == last.
    //!
    //! <b>Throws</b>: If memory allocation throws, T's constructor from a
    //!   dereferenced InpIt throws.
    //!
    //! <b>Complexity</b>: Linear to the number of elements inserted.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references of
    //!   previous values.
    template <class InpIt>
    iterator insert_after(const_iterator prev_p, InpIt first, InpIt last
       #if !defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
       , typename dtl::enable_if_c
          < !dtl::is_convertible<InpIt, size_type>::value
           && (dtl::is_input_iterator<InpIt>::value
                 || dtl::is_same<alloc_version, version_1>::value
                )
          >::type * = 0
       #endif
       )
    {
       iterator ret_it(prev_p.get());
       for (; first != last; ++first){
          ret_it = iterator(this->icont().insert_after(ret_it.get(), *this->create_node_from_it(first)));
       }
       return ret_it;
    }
 
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    //! <b>Requires</b>: prev_p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Inserts the range pointed by [il.begin(), il.end()) after prev_p.
    //!
    //! <b>Returns</b>: an iterator to the last inserted element or prev_p if il.begin() == il.end().
    //!
    //! <b>Throws</b>: If memory allocation throws, T's constructor from a
    //!   dereferenced std::initializer_list iterator throws.
    //!
    //! <b>Complexity</b>: Linear to the number of elements inserted.
    //!
    //! <b>Note</b>: Does not affect the validity of iterators and references of
    //!   previous values.
    iterator insert_after(const_iterator prev_p, std::initializer_list<value_type> il)
    {
        return insert_after(prev_p, il.begin(), il.end());
    }
 #endif
    #if !defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
    template <class FwdIt>
    iterator insert_after(const_iterator prev, FwdIt first, FwdIt last
       , typename dtl::enable_if_c
          < !dtl::is_convertible<FwdIt, size_type>::value
             && !(dtl::is_input_iterator<FwdIt>::value
                 || dtl::is_same<alloc_version, version_1>::value
                )
          >::type * = 0
       )
    {
       //Optimized allocation and construction
       insertion_functor func(this->icont(), prev.get());
       this->allocate_many_and_construct(first, boost::container::iterator_udistance(first, last), func);
       return iterator(func.inserted_first());
    }
    #endif
 
    //! <b>Effects</b>: Removes the first element from the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    void pop_front()
    {
       BOOST_ASSERT(!this->empty());
       this->icont().pop_front_and_dispose(Destroyer(this->node_alloc()));
    }
 
    //! <b>Effects</b>: Erases the element after the element pointed by prev_p
    //!    of the list.
    //!
    //! <b>Returns</b>: the first element remaining beyond the removed elements,
    //!   or end() if no such element exists.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Does not invalidate iterators or references to non erased elements.
    iterator erase_after(const_iterator prev_p)
    {
       return iterator(this->icont().erase_after_and_dispose(prev_p.get(), Destroyer(this->node_alloc())));
    }
 
    //! <b>Effects</b>: Erases the range (before_first, last) from
    //!   the list.
    //!
    //! <b>Returns</b>: the first element remaining beyond the removed elements,
    //!   or end() if no such element exists.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of erased elements.
    //!
    //! <b>Note</b>: Does not invalidate iterators or references to non erased elements.
    iterator erase_after(const_iterator before_first, const_iterator last)
    {
       return iterator(this->icont().erase_after_and_dispose(before_first.get(), last.get(), Destroyer(this->node_alloc())));
    }
 
    //! <b>Effects</b>: Swaps the contents of *this and x.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of elements on *this and x.
    void swap(slist& x)
       BOOST_NOEXCEPT_IF( allocator_traits_type::propagate_on_container_swap::value
                                 || allocator_traits_type::is_always_equal::value)
    {
       BOOST_ASSERT(allocator_traits_type::propagate_on_container_swap::value ||
                    allocator_traits_type::is_always_equal::value ||
                    this->get_stored_allocator() == x.get_stored_allocator());
       AllocHolder::swap(x);
    }
 
    //! <b>Effects</b>: Erases all the elements of the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the list.
    void clear()
    {  this->icont().clear_and_dispose(Destroyer(this->node_alloc()));  }
 
    //////////////////////////////////////////////
    //
    //              slist operations
    //
    //////////////////////////////////////////////
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by the list. x != *this
    //!
    //! <b>Effects</b>: Transfers all the elements of list x to this list, after the
    //!   the element pointed by p. No destructors or copy constructors are called.
    //!
    //! <b>Throws</b>: runtime_error if this' allocator and x's allocator
    //!   are not equal.
    //!
    //! <b>Complexity</b>: Linear to the elements in x.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of
    //!    this list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p, slist& x) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this != &x);
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice_after(prev_p.get(), x.icont());
    }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by the list. x != *this
    //!
    //! <b>Effects</b>: Transfers all the elements of list x to this list, after the
    //!   the element pointed by p. No destructors or copy constructors are called.
    //!
    //! <b>Throws</b>: runtime_error if this' allocator and x's allocator
    //!   are not equal.
    //!
    //! <b>Complexity</b>: Linear to the elements in x.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of
    //!    this list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p, BOOST_RV_REF(slist) x) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(prev_p, BOOST_MOVE_TO_LV(x));  }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of this.
    //!   i must point to an element contained in list x.
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the value pointed by i, from list x to this list,
    //!   after the element pointed by prev_p.
    //!   If prev_p == prev or prev_p == ++prev, this function is a null operation.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p, slist& x, const_iterator prev) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice_after(prev_p.get(), x.icont(), prev.get());
    }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of this.
    //!   i must point to an element contained in list x.
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the value pointed by i, from list x to this list,
    //!   after the element pointed by prev_p.
    //!   If prev_p == prev or prev_p == ++prev, this function is a null operation.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p, BOOST_RV_REF(slist) x, const_iterator prev) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(prev_p, BOOST_MOVE_TO_LV(x), prev);  }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of this.
    //!   before_first and before_last must be valid iterators of x.
    //!   prev_p must not be contained in [before_first, before_last) range.
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the range [before_first + 1, before_last + 1)
    //!   from list x to this list, after the element pointed by prev_p.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear to the number of transferred elements.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p,      slist& x,
       const_iterator before_first,  const_iterator before_last) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice_after
          (prev_p.get(), x.icont(), before_first.get(), before_last.get());
    }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of this.
    //!   before_first and before_last must be valid iterators of x.
    //!   prev_p must not be contained in [before_first, before_last) range.
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the range [before_first + 1, before_last + 1)
    //!   from list x to this list, after the element pointed by prev_p.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear to the number of transferred elements.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p,      BOOST_RV_REF(slist) x,
       const_iterator before_first,  const_iterator before_last) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(prev_p, BOOST_MOVE_TO_LV(x), before_first, before_last);  }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of this.
    //!   before_first and before_last must be valid iterators of x.
    //!   prev_p must not be contained in [before_first, before_last) range.
    //!   n == distance(before_first, before_last).
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the range [before_first + 1, before_last + 1)
    //!   from list x to this list, after the element pointed by prev_p.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p,      slist& x,
                      const_iterator before_first,  const_iterator before_last,
                      size_type n) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice_after
          (prev_p.get(), x.icont(), before_first.get(), before_last.get(), n);
    }
 
    //! <b>Requires</b>: prev_p must be a valid iterator of this.
    //!   before_first and before_last must be valid iterators of x.
    //!   prev_p must not be contained in [before_first, before_last) range.
    //!   n == distance(before_first, before_last).
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the range [before_first + 1, before_last + 1)
    //!   from list x to this list, after the element pointed by prev_p.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Constant.
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice_after(const_iterator prev_p,      BOOST_RV_REF(slist) x,
                      const_iterator before_first,  const_iterator before_last,
                      size_type n) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(prev_p, BOOST_MOVE_TO_LV(x), before_first, before_last, n);  }
 
    //! <b>Effects</b>: Removes all the elements that compare equal to value.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear time. It performs exactly size() comparisons for equality.
    //!
    //! <b>Note</b>: The relative order of elements that are not removed is unchanged,
    //!   and iterators to elements that are not removed remain valid.
    void remove(const T& value)
    {  this->remove_if(equal_to_value_type(value));  }
 
    //! <b>Effects</b>: Removes all the elements for which a specified
    //!   predicate is satisfied.
    //!
    //! <b>Throws</b>: If pred throws.
    //!
    //! <b>Complexity</b>: Linear time. It performs exactly size() calls to the predicate.
    //!
    //! <b>Note</b>: The relative order of elements that are not removed is unchanged,
    //!   and iterators to elements that are not removed remain valid.
    template <class Pred>
    void remove_if(Pred pred)
    {
       typedef value_to_node_compare<Node, Pred> value_to_node_compare_type;
       this->icont().remove_and_dispose_if(value_to_node_compare_type(pred), Destroyer(this->node_alloc()));
    }
 
    //! <b>Effects</b>: Removes adjacent duplicate elements or adjacent
    //!   elements that are equal from the list.
    //!
    //! <b>Throws</b>: If comparison throws.
    //!
    //! <b>Complexity</b>: Linear time (size()-1 comparisons equality comparisons).
    //!
    //! <b>Note</b>: The relative order of elements that are not removed is unchanged,
    //!   and iterators to elements that are not removed remain valid.
    void unique()
    {  this->unique(value_equal_t());  }
 
    //! <b>Effects</b>: Removes adjacent duplicate elements or adjacent
    //!   elements that satisfy some binary predicate from the list.
    //!
    //! <b>Throws</b>: If pred throws.
    //!
    //! <b>Complexity</b>: Linear time (size()-1 comparisons calls to pred()).
    //!
    //! <b>Note</b>: The relative order of elements that are not removed is unchanged,
    //!   and iterators to elements that are not removed remain valid.
    template <class Pred>
    void unique(Pred pred)
    {
       typedef value_to_node_compare<Node, Pred> value_to_node_compare_type;
       this->icont().unique_and_dispose(value_to_node_compare_type(pred), Destroyer(this->node_alloc()));
    }
 
    //! <b>Requires</b>: The lists x and *this must be distinct.
    //!
    //! <b>Effects</b>: This function removes all of x's elements and inserts them
    //!   in order into *this according to std::less<value_type>. The merge is stable;
    //!   that is, if an element from *this is equivalent to one from x, then the element
    //!   from *this will precede the one from x.
    //!
    //! <b>Throws</b>: If comparison throws.
    //!
    //! <b>Complexity</b>: This function is linear time: it performs at most
    //!   size() + x.size() - 1 comparisons.
    void merge(slist & x)
    {  this->merge(x, value_less_t()); }
 
    //! <b>Requires</b>: The lists x and *this must be distinct.
    //!
    //! <b>Effects</b>: This function removes all of x's elements and inserts them
    //!   in order into *this according to std::less<value_type>. The merge is stable;
    //!   that is, if an element from *this is equivalent to one from x, then the element
    //!   from *this will precede the one from x.
    //!
    //! <b>Throws</b>: If comparison throws.
    //!
    //! <b>Complexity</b>: This function is linear time: it performs at most
    //!   size() + x.size() - 1 comparisons.
    void merge(BOOST_RV_REF(slist) x)
    {  this->merge(BOOST_MOVE_TO_LV(x)); }
 
    //! <b>Requires</b>: p must be a comparison function that induces a strict weak
    //!   ordering and both *this and x must be sorted according to that ordering
    //!   The lists x and *this must be distinct.
    //!
    //! <b>Effects</b>: This function removes all of x's elements and inserts them
    //!   in order into *this. The merge is stable; that is, if an element from *this is
    //!   equivalent to one from x, then the element from *this will precede the one from x.
    //!
    //! <b>Throws</b>: If comp throws.
    //!
    //! <b>Complexity</b>: This function is linear time: it performs at most
    //!   size() + x.size() - 1 comparisons.
    //!
    //! <b>Note</b>: Iterators and references to *this are not invalidated.
    template <class StrictWeakOrdering>
    void merge(slist& x, StrictWeakOrdering comp)
    {
       typedef value_to_node_compare<Node, StrictWeakOrdering> value_to_node_compare_type;
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().merge(x.icont(), value_to_node_compare_type(comp));
    }
 
    //! <b>Requires</b>: p must be a comparison function that induces a strict weak
    //!   ordering and both *this and x must be sorted according to that ordering
    //!   The lists x and *this must be distinct.
    //!
    //! <b>Effects</b>: This function removes all of x's elements and inserts them
    //!   in order into *this. The merge is stable; that is, if an element from *this is
    //!   equivalent to one from x, then the element from *this will precede the one from x.
    //!
    //! <b>Throws</b>: If comp throws.
    //!
    //! <b>Complexity</b>: This function is linear time: it performs at most
    //!   size() + x.size() - 1 comparisons.
    //!
    //! <b>Note</b>: Iterators and references to *this are not invalidated.
    template <class StrictWeakOrdering>
    void merge(BOOST_RV_REF(slist) x, StrictWeakOrdering comp)
    {  this->merge(BOOST_MOVE_TO_LV(x), comp); }
 
    //! <b>Effects</b>: This function sorts the list *this according to std::less<value_type>.
    //!   The sort is stable, that is, the relative order of equivalent elements is preserved.
    //!
    //! <b>Throws</b>: If comparison throws.
    //!
    //! <b>Notes</b>: Iterators and references are not invalidated.
    //!
    //! <b>Complexity</b>: The number of comparisons is approximately N log N, where N
    //!   is the list's size.
    void sort()
    {  this->sort(value_less_t());  }
 
    //! <b>Effects</b>: This function sorts the list *this according to std::less<value_type>.
    //!   The sort is stable, that is, the relative order of equivalent elements is preserved.
    //!
    //! <b>Throws</b>: If comp throws.
    //!
    //! <b>Notes</b>: Iterators and references are not invalidated.
    //!
    //! <b>Complexity</b>: The number of comparisons is approximately N log N, where N
    //!   is the list's size.
    template <class StrictWeakOrdering>
    void sort(StrictWeakOrdering comp)
    {
       typedef value_to_node_compare<Node, StrictWeakOrdering> value_to_node_compare_type;
       // nothing if the slist has length 0 or 1.
       if (this->size() < 2)
          return;
       this->icont().sort(value_to_node_compare_type(comp));
    }
 
    //! <b>Effects</b>: Reverses the order of elements in the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: This function is linear time.
    //!
    //! <b>Note</b>: Iterators and references are not invalidated
    void reverse() BOOST_NOEXCEPT_OR_NOTHROW
    {  this->icont().reverse();  }
 
    //////////////////////////////////////////////
    //
    //       list compatibility interface
    //
    //////////////////////////////////////////////
 
    #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
 
    //! <b>Effects</b>: Inserts an object of type T constructed with
    //!   std::forward<Args>(args)... before p
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's in-place constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the elements before p
    template <class... Args>
    iterator emplace(const_iterator p, BOOST_FWD_REF(Args)... args)
    {  return this->emplace_after(this->previous(p), boost::forward<Args>(args)...);  }
 
    #else
 
    #define BOOST_CONTAINER_SLIST_EMPLACE_CODE(N) \
    BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
    iterator emplace(const_iterator p BOOST_MOVE_I##N BOOST_MOVE_UREF##N)\
    {\
       return this->emplace_after(this->previous(p) BOOST_MOVE_I##N BOOST_MOVE_FWD##N);\
    }\
    //
    BOOST_MOVE_ITERATE_0TO9(BOOST_CONTAINER_SLIST_EMPLACE_CODE)
    #undef BOOST_CONTAINER_SLIST_EMPLACE_CODE
 
    #endif   // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 
    #if defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Insert a copy of x before p.
    //!
    //! <b>Returns</b>: an iterator to the inserted element.
    //!
    //! <b>Throws</b>: If memory allocation throws or x's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the elements before p.
    iterator insert(const_iterator p, const T &x);
 
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Insert a new element before p with x's resources.
    //!
    //! <b>Returns</b>: an iterator to the inserted element.
    //!
    //! <b>Throws</b>: If memory allocation throws.
    //!
    //! <b>Complexity</b>: Linear to the elements before p.
    iterator insert(const_iterator prev_p, T &&x);
    #else
    BOOST_MOVE_CONVERSION_AWARE_CATCH_1ARG(insert, T, iterator, priv_insert, const_iterator, const_iterator)
    #endif
 
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Inserts n copies of x before p.
    //!
    //! <b>Returns</b>: an iterator to the first inserted element or p if n == 0.
    //!
    //! <b>Throws</b>: If memory allocation throws or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to n plus linear to the elements before p.
    iterator insert(const_iterator p, size_type n, const value_type& x)
    {
       const_iterator prev(this->previous(p));
       this->insert_after(prev, n, x);
       return ++iterator(prev.get());
    }
 
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Insert a copy of the [first, last) range before p.
    //!
    //! <b>Returns</b>: an iterator to the first inserted element or p if first == last.
    //!
    //! <b>Throws</b>: If memory allocation throws, T's constructor from a
    //!   dereferenced InpIt throws.
    //!
    //! <b>Complexity</b>: Linear to distance [first, last) plus
    //!    linear to the elements before p.
    template <class InIter>
    iterator insert(const_iterator p, InIter first, InIter last)
    {
       const_iterator prev(this->previous(p));
       this->insert_after(prev, first, last);
       return ++iterator(prev.get());
    }
 
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Insert a copy of the [il.begin(), il.end()) range before p.
    //!
    //! <b>Returns</b>: an iterator to the first inserted element or p if il.begin() == il.end().
    //!
    //! <b>Throws</b>: If memory allocation throws, T's constructor from a
    //!   dereferenced std::initializer_list iterator throws.
    //!
    //! <b>Complexity</b>: Linear to the range [il.begin(), il.end()) plus
    //!    linear to the elements before p.
    iterator insert(const_iterator p, std::initializer_list<value_type> il)
    {
        return insert(p, il.begin(), il.end());
    }
 #endif
 
    //! <b>Requires</b>: p must be a valid iterator of *this.
    //!
    //! <b>Effects</b>: Erases the element at p.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the number of elements before p.
    iterator erase(const_iterator p) BOOST_NOEXCEPT_OR_NOTHROW
    {  return iterator(this->erase_after(previous(p))); }
 
    //! <b>Requires</b>: first and last must be valid iterator to elements in *this.
    //!
    //! <b>Effects</b>: Erases the elements pointed by [first, last).
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Linear to the distance between first and last plus
    //!   linear to the elements before first.
    iterator erase(const_iterator first, const_iterator last) BOOST_NOEXCEPT_OR_NOTHROW
    {  return iterator(this->erase_after(previous(first), last)); }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by the list. x != *this. this' allocator and x's allocator shall compare equal
    //!
    //! <b>Effects</b>: Transfers all the elements of list x to this list, before the
    //!   the element pointed by p. No destructors or copy constructors are called.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear in distance(begin(), p), and linear in x.size().
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of
    //!    this list. Iterators of this list and all the references are not invalidated.
    void splice(const_iterator p, slist& x) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(this->previous(p), x);  }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by the list. x != *this. this' allocator and x's allocator shall compare equal
    //!
    //! <b>Effects</b>: Transfers all the elements of list x to this list, before the
    //!   the element pointed by p. No destructors or copy constructors are called.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear in distance(begin(), p), and linear in x.size().
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of
    //!    this list. Iterators of this list and all the references are not invalidated.
    void splice(const_iterator p, BOOST_RV_REF(slist) x) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice(p, BOOST_MOVE_TO_LV(x));  }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by this list. i must point to an element contained in list x.
    //!   this' allocator and x's allocator shall compare equal
    //!
    //! <b>Effects</b>: Transfers the value pointed by i, from list x to this list,
    //!   before the element pointed by p. No destructors or copy constructors are called.
    //!   If p == i or p == ++i, this function is a null operation.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear in distance(begin(), p), and in distance(x.begin(), i).
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice(const_iterator p, slist& x, const_iterator i) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(this->previous(p), x, x.previous(i));  }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by this list. i must point to an element contained in list x.
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Effects</b>: Transfers the value pointed by i, from list x to this list,
    //!   before the element pointed by p. No destructors or copy constructors are called.
    //!   If p == i or p == ++i, this function is a null operation.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear in distance(begin(), p), and in distance(x.begin(), i).
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice(const_iterator p, BOOST_RV_REF(slist) x, const_iterator i) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice(p, BOOST_MOVE_TO_LV(x), i);  }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by this list. first and last must point to elements contained in list x.
    //!
    //! <b>Effects</b>: Transfers the range pointed by first and last from list x to this list,
    //!   before the element pointed by p. No destructors or copy constructors are called.
    //!   this' allocator and x's allocator shall compare equal.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear in distance(begin(), p), in distance(x.begin(), first),
    //!   and in distance(first, last).
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice(const_iterator p, slist& x, const_iterator first, const_iterator last) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice_after(this->previous(p), x, x.previous(first), x.previous(last));  }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by this list. first and last must point to elements contained in list x.
    //!   this' allocator and x's allocator shall compare equal
    //!
    //! <b>Effects</b>: Transfers the range pointed by first and last from list x to this list,
    //!   before the element pointed by p. No destructors or copy constructors are called.
    //!
    //! <b>Throws</b>: Nothing
    //!
    //! <b>Complexity</b>: Linear in distance(begin(), p), in distance(x.begin(), first),
    //!   and in distance(first, last).
    //!
    //! <b>Note</b>: Iterators of values obtained from list x now point to elements of this
    //!   list. Iterators of this list and all the references are not invalidated.
    void splice(const_iterator p, BOOST_RV_REF(slist) x, const_iterator first, const_iterator last) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice(p, BOOST_MOVE_TO_LV(x), first, last);  }
 
    //! <b>Effects</b>: Returns true if x and y are equal
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    friend bool operator==(const slist& x, const slist& y)
    {  return x.size() == y.size() && ::boost::container::algo_equal(x.begin(), x.end(), y.begin());  }
 
    //! <b>Effects</b>: Returns true if x and y are unequal
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       friend bool operator!=(const slist& x, const slist& y)
    {  return !(x == y); }
 
    //! <b>Effects</b>: Returns true if x is less than y
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       friend bool operator<(const slist& x, const slist& y)
    {  return ::boost::container::algo_lexicographical_compare(x.begin(), x.end(), y.begin(), y.end());  }
 
    //! <b>Effects</b>: Returns true if x is greater than y
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       friend bool operator>(const slist& x, const slist& y)
    {  return y < x;  }
 
    //! <b>Effects</b>: Returns true if x is equal or less than y
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       friend bool operator<=(const slist& x, const slist& y)
    {  return !(y < x);  }
 
    //! <b>Effects</b>: Returns true if x is equal or greater than y
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       friend bool operator>=(const slist& x, const slist& y)
    {  return !(x < y);  }
 
    //! <b>Effects</b>: x.swap(y)
    //!
    //! <b>Complexity</b>: Constant.
    friend void swap(slist& x, slist& y)
        BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT(x.swap(y)))
    {  x.swap(y);  }
 
    #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
    private:
 
    template<class U>
    void priv_push_front(BOOST_FWD_REF(U) x)
    {  this->icont().push_front(*this->create_node(::boost::forward<U>(x))); }
 
    bool priv_try_shrink(size_type new_size, const_iterator &last_pos)
    {
       typename Icont::iterator end_n(this->icont().end()), cur(this->icont().before_begin()), cur_next;
       while (++(cur_next = cur) != end_n && new_size > 0){
          --new_size;
          cur = cur_next;
       }
       last_pos = const_iterator(cur);
       if (cur_next != end_n){
          this->erase_after(last_pos, const_iterator(end_n));
          return true;
       }
       else{
          return false;
       }
    }
 
    template<class U>
    iterator priv_insert(const_iterator p, BOOST_FWD_REF(U) x)
    {  return this->insert_after(previous(p), ::boost::forward<U>(x)); }
 
    template<class U>
    iterator priv_insert_after(const_iterator prev_p, BOOST_FWD_REF(U) x)
    {  return iterator(this->icont().insert_after(prev_p.get(), *this->create_node(::boost::forward<U>(x)))); }
 
    class insertion_functor;
    friend class insertion_functor;
 
    class insertion_functor
    {
       Icont &icont_;
       typedef typename Icont::iterator       iiterator;
       typedef typename Icont::const_iterator iconst_iterator;
       const iconst_iterator prev_;
       iiterator   ret_;
 
       public:
       insertion_functor(Icont &icont, typename Icont::const_iterator prev)
          :  icont_(icont), prev_(prev), ret_(prev.unconst())
       {}
 
       void operator()(Node &n)
       {
          ret_ = this->icont_.insert_after(prev_, n);
       }
 
       iiterator inserted_first() const
       {  return ret_;   }
    };
 
    //Functors for member algorithm defaults
    typedef value_less<value_type>   value_less_t;
    typedef value_equal<value_type>  value_equal_t;
 
    #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 };
 
 #ifndef BOOST_CONTAINER_NO_CXX17_CTAD
 
 template <typename InpIt>
 slist(InpIt, InpIt) ->
    slist<typename iterator_traits<InpIt>::value_type>;
 
 template <typename InpIt, typename Allocator>
 slist(InpIt, InpIt, Allocator const&) ->
    slist<typename iterator_traits<InpIt>::value_type, Allocator>;
 
 #endif
 
 }}
 
 #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
 namespace boost {
 
 //!has_trivial_destructor_after_move<> == true_type
 //!specialization for optimizations
 template <class T, class Allocator>
 struct has_trivial_destructor_after_move<boost::container::slist<T, Allocator> >
 {
    typedef typename boost::container::slist<T, Allocator>::allocator_type allocator_type;
    typedef typename ::boost::container::allocator_traits<allocator_type>::pointer pointer;
    static const bool value = ::boost::has_trivial_destructor_after_move<allocator_type>::value &&
                              ::boost::has_trivial_destructor_after_move<pointer>::value;
 };
 
 namespace container {
 
 }} //namespace boost{  namespace container {
 
 #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
 // Specialization of insert_iterator so that insertions will be constant
 // time rather than linear time.
 
 #include <boost/move/detail/std_ns_begin.hpp>
 BOOST_CONTAINER_DOC1ST(namespace std {, BOOST_MOVE_STD_NS_BEG)
 
 //! A specialization of insert_iterator
 //! that works with slist
 template <class T, class ValueAllocator>
 class insert_iterator<boost::container::slist<T, ValueAllocator> >
 {
    private:
    typedef boost::container::slist<T, ValueAllocator> Container;
    Container* container;
    typename Container::iterator iter;
 
    public:
    typedef Container           container_type;
    typedef output_iterator_tag iterator_category;
    typedef void                value_type;
    typedef void                difference_type;
    typedef void                pointer;
    typedef void                reference;
 
    insert_iterator(Container& x,
                    typename Container::iterator i,
                    bool is_previous = false)
       : container(&x), iter(is_previous ? i : x.previous(i)){ }
 
    insert_iterator<Container>&
       operator=(const typename Container::value_type& value)
    {
       iter = container->insert_after(iter, value);
       return *this;
    }
    insert_iterator<Container>& operator*(){ return *this; }
    insert_iterator<Container>& operator++(){ return *this; }
    insert_iterator<Container>& operator++(int){ return *this; }
 };
 
 BOOST_CONTAINER_DOC1ST( }, BOOST_MOVE_STD_NS_END)
 #include <boost/move/detail/std_ns_end.hpp>
 
 #include <boost/container/detail/config_end.hpp>
 
 #endif // BOOST_CONTAINER_SLIST_HPP

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