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+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Olaf Krzikalla 2004-2006.
+// (C) Copyright Ion Gaztanaga 2006-2009
+//
+// 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/intrusive for documentation.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTRUSIVE_LIST_NODE_HPP
+#define BOOST_INTRUSIVE_LIST_NODE_HPP
+
+#include <boost/intrusive/detail/config_begin.hpp>
+#include <iterator>
+#include <boost/intrusive/detail/assert.hpp>
+#include <boost/intrusive/pointer_traits.hpp>
+
+namespace boost {
+namespace intrusive {
+
+// list_node_traits can be used with circular_list_algorithms and supplies
+// a list_node holding the pointers needed for a double-linked list
+// it is used by list_derived_node and list_member_node
+
+template<class VoidPointer>
+struct list_node
+{
+ typedef typename pointer_traits
+ <VoidPointer>:: template rebind_pointer<list_node>::type node_ptr;
+ node_ptr next_;
+ node_ptr prev_;
+};
+
+template<class VoidPointer>
+struct list_node_traits
+{
+ typedef list_node<VoidPointer> node;
+ typedef typename pointer_traits
+ <VoidPointer>:: template rebind_pointer<node>::type node_ptr;
+ typedef typename pointer_traits
+ <VoidPointer>:: template rebind_pointer<const node>::type const_node_ptr;
+
+ static const node_ptr &get_previous(const const_node_ptr & n)
+ { return n->prev_; }
+
+ static void set_previous(const node_ptr & n, const node_ptr & prev)
+ { n->prev_ = prev; }
+
+ static const node_ptr &get_next(const const_node_ptr & n)
+ { return n->next_; }
+
+ static void set_next(const node_ptr & n, const node_ptr & next)
+ { n->next_ = next; }
+};
+
+// list_iterator provides some basic functions for a
+// node oriented bidirectional iterator:
+template<class Container, bool IsConst>
+class list_iterator
+ : public std::iterator
+ < std::bidirectional_iterator_tag
+ , typename Container::value_type
+ , typename Container::difference_type
+ , typename detail::if_c<IsConst,typename Container::const_pointer,typename Container::pointer>::type
+ , typename detail::if_c<IsConst,typename Container::const_reference,typename Container::reference>::type
+ >
+{
+ protected:
+ typedef typename Container::real_value_traits real_value_traits;
+ typedef typename real_value_traits::node_traits node_traits;
+ typedef typename node_traits::node node;
+ typedef typename node_traits::node_ptr node_ptr;
+ typedef typename pointer_traits<node_ptr>::
+ template rebind_pointer<void>::type void_pointer;
+ static const bool store_container_ptr =
+ detail::store_cont_ptr_on_it<Container>::value;
+
+ public:
+ typedef typename Container::value_type value_type;
+ typedef typename detail::if_c<IsConst,typename Container::const_pointer,typename Container::pointer>::type pointer;
+ typedef typename detail::if_c<IsConst,typename Container::const_reference,typename Container::reference>::type reference;
+
+ list_iterator()
+ : members_ (node_ptr(), 0)
+ {}
+
+ explicit list_iterator(const node_ptr & node, const Container *cont_ptr)
+ : members_ (node, cont_ptr)
+ {}
+
+ list_iterator(list_iterator<Container, false> const& other)
+ : members_(other.pointed_node(), other.get_container())
+ {}
+
+ const node_ptr &pointed_node() const
+ { return members_.nodeptr_; }
+
+ list_iterator &operator=(const node_ptr &node)
+ { members_.nodeptr_ = node; return static_cast<list_iterator&>(*this); }
+
+ public:
+ list_iterator& operator++()
+ {
+ node_ptr p = node_traits::get_next(members_.nodeptr_);
+ members_.nodeptr_ = p;
+ //members_.nodeptr_ = node_traits::get_next(members_.nodeptr_);
+ return static_cast<list_iterator&> (*this);
+ }
+
+ list_iterator operator++(int)
+ {
+ list_iterator result (*this);
+ members_.nodeptr_ = node_traits::get_next(members_.nodeptr_);
+ return result;
+ }
+
+ list_iterator& operator--()
+ {
+ members_.nodeptr_ = node_traits::get_previous(members_.nodeptr_);
+ return static_cast<list_iterator&> (*this);
+ }
+
+ list_iterator operator--(int)
+ {
+ list_iterator result (*this);
+ members_.nodeptr_ = node_traits::get_previous(members_.nodeptr_);
+ return result;
+ }
+
+ friend bool operator== (const list_iterator& l, const list_iterator& r)
+ { return l.pointed_node() == r.pointed_node(); }
+
+ friend bool operator!= (const list_iterator& l, const list_iterator& r)
+ { return !(l == r); }
+
+ reference operator*() const
+ { return *operator->(); }
+
+ pointer operator->() const
+ { return this->get_real_value_traits()->to_value_ptr(members_.nodeptr_); }
+
+ const Container *get_container() const
+ {
+ if(store_container_ptr){
+ const Container* c = static_cast<const Container*>(members_.get_ptr());
+ BOOST_INTRUSIVE_INVARIANT_ASSERT(c != 0);
+ return c;
+ }
+ else{
+ return 0;
+ }
+ }
+
+ const real_value_traits *get_real_value_traits() const
+ {
+ if(store_container_ptr)
+ return &this->get_container()->get_real_value_traits();
+ else
+ return 0;
+ }
+
+ list_iterator<Container, false> unconst() const
+ { return list_iterator<Container, false>(this->pointed_node(), this->get_container()); }
+
+ private:
+ struct members
+ : public detail::select_constptr
+ <void_pointer, store_container_ptr>::type
+ {
+ typedef typename detail::select_constptr
+ <void_pointer, store_container_ptr>::type Base;
+
+ members(const node_ptr &n_ptr, const void *cont)
+ : Base(cont), nodeptr_(n_ptr)
+ {}
+
+ node_ptr nodeptr_;
+ } members_;
+};
+
+} //namespace intrusive
+} //namespace boost
+
+#include <boost/intrusive/detail/config_end.hpp>
+
+#endif //BOOST_INTRUSIVE_LIST_NODE_HPP