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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_SLIST_NODE_HPP
#define BOOST_INTRUSIVE_SLIST_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 {
template<class VoidPointer>
struct slist_node
{
typedef typename pointer_traits
<VoidPointer>::template rebind_pointer<slist_node>::type node_ptr;
node_ptr next_;
};
// slist_node_traits can be used with circular_slist_algorithms and supplies
// a slist_node holding the pointers needed for a singly-linked list
// it is used by slist_base_hook and slist_member_hook
template<class VoidPointer>
struct slist_node_traits
{
typedef slist_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_next(const const_node_ptr & n)
{ return n->next_; }
static void set_next(const node_ptr & n, const node_ptr & next)
{ n->next_ = next; }
};
// slist_iterator provides some basic functions for a
// node oriented bidirectional iterator:
template<class Container, bool IsConst>
class slist_iterator
: public std::iterator
< std::forward_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;
slist_iterator()
: members_ (node_ptr(), 0)
{}
explicit slist_iterator(const node_ptr & node, const Container *cont_ptr)
: members_ (node, cont_ptr)
{}
slist_iterator(slist_iterator<Container, false> const& other)
: members_(other.pointed_node(), other.get_container())
{}
const node_ptr &pointed_node() const
{ return members_.nodeptr_; }
slist_iterator &operator=(const node_ptr &node)
{ members_.nodeptr_ = node; return static_cast<slist_iterator&>(*this); }
public:
slist_iterator& operator++()
{
members_.nodeptr_ = node_traits::get_next(members_.nodeptr_);
return static_cast<slist_iterator&> (*this);
}
slist_iterator operator++(int)
{
slist_iterator result (*this);
members_.nodeptr_ = node_traits::get_next(members_.nodeptr_);
return result;
}
friend bool operator== (const slist_iterator& l, const slist_iterator& r)
{ return l.pointed_node() == r.pointed_node(); }
friend bool operator!= (const slist_iterator& l, const slist_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)
return static_cast<const Container*>(members_.get_ptr());
else
return 0;
}
slist_iterator<Container, false> unconst() const
{ return slist_iterator<Container, false>(this->pointed_node(), this->get_container()); }
const real_value_traits *get_real_value_traits() const
{
if(store_container_ptr)
return &this->get_container()->get_real_value_traits();
else
return 0;
}
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_SLIST_NODE_HPP
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