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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2015. 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_LIST_HPP
 #define BOOST_CONTAINER_LIST_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>
 #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/version_type.hpp>
 #include <boost/container/detail/value_functors.hpp>
 // move
 #include <boost/move/utility_core.hpp>
 #include <boost/move/iterator.hpp>
 #include <boost/move/traits.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>
 
 // intrusive
 #include <boost/intrusive/pointer_traits.hpp>
 #include <boost/intrusive/list.hpp>
 // other
 #include <boost/assert.hpp>
 // std
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
 #include <initializer_list>
 #endif
 
 namespace boost {
 namespace container {
 
 #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 namespace dtl {
 
 template<class VoidPointer>
 struct list_hook
 {
    typedef typename dtl::bi::make_list_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, list_hook<VoidPointer> > >
 {
   typedef T type;
 };
 
 template<class Allocator>
 struct intrusive_list_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, list_hook<void_pointer> > node_type;
    typedef typename dtl::bi::make_list
       < node_type
       , dtl::bi::base_hook<typename list_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
 
 //! A list is a doubly linked list. That is, it is a Sequence that supports both
 //! forward and backward traversal, and (amortized) constant time insertion and
 //! removal of elements at the beginning or the end, or in the middle. 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, list<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.
 //!
 //! \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 list
    : protected dtl::node_alloc_holder
       < typename real_allocator<T, Allocator>::type
       , typename dtl::intrusive_list_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_list_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(list)
 
    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;
    typedef BOOST_CONTAINER_IMPDEF(boost::container::reverse_iterator<iterator>)           reverse_iterator;
    typedef BOOST_CONTAINER_IMPDEF(boost::container::reverse_iterator<const_iterator>)     const_reverse_iterator;
 
    //////////////////////////////////////////////
    //
    //          construct/copy/destroy
    //
    //////////////////////////////////////////////
 
    //! <b>Effects</b>: Default constructs a list.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor throws.
    //!
    //! <b>Complexity</b>: Constant.
    list() 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 list(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 list(size_type n)
       : AllocHolder(ValueAllocator())
    {  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.
    list(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.
    list(size_type n, const T& value, const ValueAllocator& a = ValueAllocator())
       : AllocHolder(a)
    {  this->insert(this->cbegin(), n, value);  }
 
    //! <b>Effects</b>: Copy constructs a list.
    //!
    //! <b>Postcondition</b>: x == *this.
    //!
    //! <b>Throws</b>: If allocator_type's default constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the elements x contains.
    list(const list& x)
       : AllocHolder(x)
    {  this->insert(this->cbegin(), 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.
    list(BOOST_RV_REF(list) 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 or copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to the elements x contains.
    list(const list& x, const allocator_type &a)
       : AllocHolder(a)
    {  this->insert(this->cbegin(), x.begin(), x.end());   }
 
    //! <b>Effects</b>: Move constructor sing 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.
    list(BOOST_RV_REF(list) x, const allocator_type &a)
       : AllocHolder(a)
    {
       if(this->node_alloc() == x.node_alloc()){
          this->icont().swap(x.icont());
       }
       else{
          this->insert(this->cbegin(), boost::make_move_iterator(x.begin()), boost::make_move_iterator(x.end()));
       }
    }
 
    //! <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>
    list(InpIt first, InpIt last, const ValueAllocator &a = ValueAllocator())
       : AllocHolder(a)
    {  this->insert(this->cbegin(), 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()).
    list(std::initializer_list<value_type> il, const ValueAllocator &a = ValueAllocator())
       : AllocHolder(a)
    {  this->insert(this->cbegin(), il.begin(), il.end()); }
 #endif
 
    //! <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.
    BOOST_CONTAINER_FORCEINLINE ~list() BOOST_NOEXCEPT_OR_NOTHROW
    {} //AllocHolder clears the list
 
    //! <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.
    list& operator=(BOOST_COPY_ASSIGN_REF(list) 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>: Move assignment. All x's values are transferred to *this.
    //!
    //! <b>Postcondition</b>: x.empty(). *this contains a the elements x had
    //!   before the function.
    //!
    //! <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.
    list& operator=(BOOST_RV_REF(list) x)
       BOOST_NOEXCEPT_IF(allocator_traits_type::propagate_on_container_move_assignment::value
                                   || allocator_traits_type::is_always_equal::value)
    {
       if (BOOST_LIKELY(this != &x)) {
          NodeAlloc &this_alloc = this->node_alloc();
          NodeAlloc &x_alloc    = x.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(x);
             //Obtain resources
             this->icont() = boost::move(x.icont());
          }
          //Else do a one by one move
          else{
             this->assign( boost::make_move_iterator(x.begin())
                         , boost::make_move_iterator(x.end()));
          }
       }
       return *this;
    }
 
 #if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    //! <b>Effects</b>: Makes *this contain the same elements as il.
    //!
    //! <b>Postcondition</b>: this->size() == il.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.
    BOOST_CONTAINER_FORCEINLINE list& operator=(std::initializer_list<value_type> il)
    {
       this->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.
    BOOST_CONTAINER_FORCEINLINE 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 first1      = this->begin();
       const iterator last1 = this->end();
       for ( ; first1 != last1 && first != last; ++first1, ++first)
          *first1 = *first;
       if (first == last)
          this->erase(first1, last1);
       else{
          this->insert(last1, first, last);
       }
    }
 
 #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 n.
    BOOST_CONTAINER_FORCEINLINE void assign(std::initializer_list<value_type> il)
    { this->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 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 reverse_iterator pointing to the beginning
    //! of the reversed list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       reverse_iterator rbegin() BOOST_NOEXCEPT_OR_NOTHROW
    {  return reverse_iterator(end());  }
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the beginning
    //! of the reversed list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_reverse_iterator rbegin() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->crbegin();  }
 
    //! <b>Effects</b>: Returns a reverse_iterator pointing to the end
    //! of the reversed list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       reverse_iterator rend() BOOST_NOEXCEPT_OR_NOTHROW
    {  return reverse_iterator(begin());   }
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the end
    //! of the reversed list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_reverse_iterator rend() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return this->crend();   }
 
    //! <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>Effects</b>: Returns a const_reverse_iterator pointing to the beginning
    //! of the reversed list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_reverse_iterator crbegin() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return const_reverse_iterator(this->cend());  }
 
    //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the end
    //! of the reversed list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       const_reverse_iterator crend() const BOOST_NOEXCEPT_OR_NOTHROW
    {  return const_reverse_iterator(this->cbegin());   }
 
    //////////////////////////////////////////////
    //
    //                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 BOOST_NOEXCEPT_OR_NOTHROW
    {  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 BOOST_NOEXCEPT_OR_NOTHROW
    {   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 BOOST_NOEXCEPT_OR_NOTHROW
    {  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)
    {
       if(!priv_try_shrink(new_size)){
          typedef value_init_construct_iterator<value_type> value_init_iterator;
          this->insert(this->cend(), 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)
    {
       if(!priv_try_shrink(new_size)){
          this->insert(this->cend(), new_size - this->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_NOEXCEPT_OR_NOTHROW
    {
       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_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(!this->empty());
       return *this->begin();
    }
 
    //! <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 back() BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(!this->empty());
       return *(--this->end());
    }
 
    //! <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 back() const BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(!this->empty());
       return *(--this->end());
    }
 
    //////////////////////////////////////////////
    //
    //                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 end of the list.
    //!
    //! <b>Returns</b>: A reference to the created object.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's in-place constructor throws.
    //!
    //! <b>Complexity</b>: Constant
    template <class... Args>
    reference emplace_back(BOOST_FWD_REF(Args)... args)
    {  return *this->emplace(this->cend(), boost::forward<Args>(args)...); }
 
    //! <b>Effects</b>: Inserts an object of type T constructed with
    //!   std::forward<Args>(args)... in the beginning of the list.
    //!
    //! <b>Returns</b>: A reference to the created object.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's in-place constructor throws.
    //!
    //! <b>Complexity</b>: Constant
    template <class... Args>
    reference emplace_front(BOOST_FWD_REF(Args)... args)
    {  return *this->emplace(this->cbegin(), boost::forward<Args>(args)...);  }
 
    //! <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>: Constant
    template <class... Args>
    iterator emplace(const_iterator position, BOOST_FWD_REF(Args)... args)
    {
       BOOST_ASSERT((priv_is_linked)(position));
       NodePtr pnode(AllocHolder::create_node(boost::forward<Args>(args)...));
       return iterator(this->icont().insert(position.get(), *pnode));
    }
 
    #else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
 
    #define BOOST_CONTAINER_LIST_EMPLACE_CODE(N) \
    BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
    reference emplace_back(BOOST_MOVE_UREF##N)\
    {  return *this->emplace(this->cend() BOOST_MOVE_I##N BOOST_MOVE_FWD##N);  }\
    \
    BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
    reference emplace_front(BOOST_MOVE_UREF##N)\
    {  return *this->emplace(this->cbegin() BOOST_MOVE_I##N BOOST_MOVE_FWD##N);}\
    \
    BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
    iterator emplace(const_iterator position BOOST_MOVE_I##N BOOST_MOVE_UREF##N)\
    {\
       BOOST_ASSERT(position == this->cend() || (--(++position) == position) );\
       NodePtr pnode (AllocHolder::create_node(BOOST_MOVE_FWD##N));\
       return iterator(this->icont().insert(position.get(), *pnode));\
    }\
    //
    BOOST_MOVE_ITERATE_0TO9(BOOST_CONTAINER_LIST_EMPLACE_CODE)
    #undef BOOST_CONTAINER_LIST_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>Effects</b>: Inserts a copy of x at the end of the list.
    //!
    //! <b>Throws</b>: If memory allocation throws or
    //!   T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    void push_back(const T &x);
 
    //! <b>Effects</b>: Constructs a new element in the end 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_back(T &&x);
    #else
    BOOST_MOVE_CONVERSION_AWARE_CATCH(push_back, T, void, priv_push_back)
    #endif
 
    #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>: Amortized constant time.
    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>: Amortized constant time.
    iterator insert(const_iterator 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 is 0.
    //!
    //! <b>Throws</b>: If memory allocation throws or T's copy constructor throws.
    //!
    //! <b>Complexity</b>: Linear to n.
    iterator insert(const_iterator position, size_type n, const T& x)
    {
       //range check is done by insert
       typedef constant_iterator<value_type> cvalue_iterator;
       return this->insert(position, cvalue_iterator(x, n), cvalue_iterator());
    }
 
    //! <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).
    template <class InpIt>
    iterator insert(const_iterator 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
       )
    {
       BOOST_ASSERT((priv_is_linked)(p));
       const typename Icont::iterator ipos(p.get());
       iterator ret_it(ipos);
       if(first != last){
          ret_it = iterator(this->icont().insert(ipos, *this->create_node_from_it(first)));
          ++first;
       }
       for (; first != last; ++first){
          this->icont().insert(ipos, *this->create_node_from_it(first));
       }
       return ret_it;
    }
 
    #if !defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
    template <class FwdIt>
    iterator insert(const_iterator position, 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
       )
    {
       BOOST_ASSERT((priv_is_linked)(position));
       //Optimized allocation and construction
       insertion_functor func(this->icont(), position.get());
       iterator before_p(position.get());
       --before_p;
       this->allocate_many_and_construct(first, boost::container::iterator_udistance(first, last), func);
       return ++before_p;
    }
    #endif
 
 #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 if.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 distance [il.begin(), il.end()).
    iterator insert(const_iterator p, std::initializer_list<value_type> il)
    {
       //position range check is done by insert()
       return insert(p, il.begin(), il.end());
    }
 #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_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(!this->empty());
       this->erase(this->cbegin());
    }
 
    //! <b>Effects</b>: Removes the last element from the list.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Amortized constant time.
    void pop_back() BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(!this->empty());
       const_iterator tmp = this->cend();
       this->erase(--tmp);
    }
 
    //! <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>: Amortized constant time.
    iterator erase(const_iterator p) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(p != this->cend() && (priv_is_linked)(p));
       return iterator(this->icont().erase_and_dispose(p.get(), Destroyer(this->node_alloc())));
    }
 
    //! <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.
    iterator erase(const_iterator first, const_iterator last) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(first == last || (first != this->cend() && (priv_is_linked)(first)));
       BOOST_ASSERT(first == last || (priv_is_linked)(last));
       return iterator(AllocHolder::erase_range(first.get(), last.get(), alloc_version()));
    }
 
    //! <b>Effects</b>: Swaps the contents of *this and x.
    //!
    //! <b>Throws</b>: Nothing.
    //!
    //! <b>Complexity</b>: Constant.
    void swap(list& 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() BOOST_NOEXCEPT_OR_NOTHROW
    {  AllocHolder::clear(alloc_version());  }
 
    //////////////////////////////////////////////
    //
    //              slist operations
    //
    //////////////////////////////////////////////
 
    //! <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>: 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(const_iterator p, list& x) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT((priv_is_linked)(p));
       BOOST_ASSERT(this != &x);
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice(p.get(), x.icont());
    }
 
    //! <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>: 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(const_iterator p, BOOST_RV_REF(list) x) BOOST_NOEXCEPT_OR_NOTHROW
    {
       //Checks done in splice
       this->splice(p, static_cast<list&>(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>: 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(const_iterator p, list &x, const_iterator i) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT((priv_is_linked)(p));
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice(p.get(), x.icont(), i.get());
    }
 
    //! <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>: 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(const_iterator p, BOOST_RV_REF(list) x, const_iterator i) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this != &x);
       //Additional checks done in splice()
       this->splice(p, static_cast<list&>(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.
    //!   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 to the number of elements transferred.
    //!
    //! <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, list &x, const_iterator first, const_iterator last) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT((priv_is_linked)(p));
       BOOST_ASSERT(first == last || (first != x.cend() && x.priv_is_linked(first)));
       BOOST_ASSERT(first == last || x.priv_is_linked(last));
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice(p.get(), x.icont(), first.get(), last.get());
    }
 
    //! <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 to the number of elements transferred.
    //!
    //! <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(list) x, const_iterator first, const_iterator last) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this != &x);
       //Additional checks done in splice()
       this->splice(p, static_cast<list&>(x), first, 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.
    //!   n == distance(first, last). 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>: 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.
    //!
    //! <b>Note</b>: Non-standard extension
    void splice(const_iterator p, list &x, const_iterator first, const_iterator last, size_type n) BOOST_NOEXCEPT_OR_NOTHROW
    {
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       this->icont().splice(p.get(), x.icont(), first.get(), last.get(), n);
    }
 
    //! <b>Requires</b>: p must point to an element contained
    //!   by this list. first and last must point to elements contained in list x.
    //!   n == distance(first, last). 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>: 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.
    //!
    //! <b>Note</b>: Non-standard extension
    void splice(const_iterator p, BOOST_RV_REF(list) x, const_iterator first, const_iterator last, size_type n) BOOST_NOEXCEPT_OR_NOTHROW
    {  this->splice(p, static_cast<list&>(x), first, last, n);  }
 
    //! <b>Effects</b>: Removes all the elements that compare equal to value.
    //!
    //! <b>Throws</b>: If comparison throws.
    //!
    //! <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 BinaryPredicate>
    void unique(BinaryPredicate binary_pred)
    {
       typedef value_to_node_compare<Node, BinaryPredicate> value_to_node_compare_type;
       this->icont().unique_and_dispose(value_to_node_compare_type(binary_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(list &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(list) x)
    {  this->merge(static_cast<list&>(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(list &x, const StrictWeakOrdering &comp)
    {
       BOOST_ASSERT(this->node_alloc() == x.node_alloc());
       typedef value_to_node_compare<Node, StrictWeakOrdering> value_to_node_compare_type;
       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(list) x, StrictWeakOrdering comp)
    {  this->merge(static_cast<list&>(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)
    {
       // nothing if the list has length 0 or 1.
       if (this->size() < 2)
          return;
       typedef value_to_node_compare<Node, StrictWeakOrdering> value_to_node_compare_type;
       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(); }
 
    //! <b>Effects</b>: Returns true if x and y are equal
    //!
    //! <b>Complexity</b>: Linear to the number of elements in the container.
    BOOST_CONTAINER_ATTRIBUTE_NODISCARD BOOST_CONTAINER_FORCEINLINE
       friend bool operator==(const list& x, const list& 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 list& x, const list& 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 list& x, const list& 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 list& x, const list& 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 list& x, const list& 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 list& x, const list& y)
    {  return !(x < y);  }
 
    //! <b>Effects</b>: x.swap(y)
    //!
    //! <b>Complexity</b>: Constant.
    BOOST_CONTAINER_FORCEINLINE friend void swap(list& x, list& y)
        BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT(x.swap(y)))
    {  x.swap(y);  }
 
    #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
    private:
 
    static bool priv_is_linked(const_iterator const position)
    {
       const_iterator cur(position);
       //This list is circular including end nodes
       return (--(++cur)) == position && (++(--cur)) == position;
    }
 
    bool priv_try_shrink(size_type new_size)
    {
       const size_type len = this->size();
       if(len > new_size){
          const const_iterator iend = this->cend();
          size_type to_erase = len - new_size;
          const_iterator ifirst;
          if(to_erase < len/2u){
             ifirst = iend;
             while(to_erase--){
                --ifirst;
             }
          }
          else{
             ifirst = this->cbegin();
             size_type to_skip = len - to_erase;
             while(to_skip--){
                ++ifirst;
             }
          }
          this->erase(ifirst, iend);
          return true;
       }
       else{
          return false;
       }
    }
 
    iterator priv_insert(const_iterator p, const T &x)
    {
       BOOST_ASSERT((priv_is_linked)(p));
       NodePtr tmp = AllocHolder::create_node(x);
       return iterator(this->icont().insert(p.get(), *tmp));
    }
 
    iterator priv_insert(const_iterator p, BOOST_RV_REF(T) x)
    {
       BOOST_ASSERT((priv_is_linked)(p));
       NodePtr tmp = AllocHolder::create_node(boost::move(x));
       return iterator(this->icont().insert(p.get(), *tmp));
    }
 
    template<class U>
    void priv_push_back(BOOST_FWD_REF(U) x)
    {  this->icont().push_back(*this->create_node(::boost::forward<U>(x))); }
 
    template<class U>
    void priv_push_front(BOOST_FWD_REF(U) x)
    {  this->icont().push_front(*this->create_node(::boost::forward<U>(x))); }
 
    class insertion_functor;
    friend class insertion_functor;
 
    class insertion_functor
    {
       Icont &icont_;
       typedef typename Icont::const_iterator iconst_iterator;
       const iconst_iterator pos_;
 
       public:
       insertion_functor(Icont &icont, typename Icont::const_iterator pos)
          :  icont_(icont), pos_(pos)
       {}
 
       void operator()(Node &n)
       {
          this->icont_.insert(pos_, n);
       }
    };
 
    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 InputIterator>
 list(InputIterator, InputIterator) ->
    list<typename iterator_traits<InputIterator>::value_type>;
 
 template <typename InputIterator, typename ValueAllocator>
 list(InputIterator, InputIterator, ValueAllocator const&) ->
    list<typename iterator_traits<InputIterator>::value_type, ValueAllocator>;
 #endif
 
 #ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
 }  //namespace container {
 
 //!has_trivial_destructor_after_move<> == true_type
 //!specialization for optimizations
 template <class T, class Allocator>
 struct has_trivial_destructor_after_move<boost::container::list<T, Allocator> >
 {
    typedef typename boost::container::list<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 {
 
 #endif   //#ifndef BOOST_CONTAINER_DOXYGEN_INVOKED
 
 }}
 
 #include <boost/container/detail/config_end.hpp>
 
 #endif // BOOST_CONTAINER_LIST_HPP

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