///////////////////////////////////////////////////////////////////////////// | |
// | |
// (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_DERIVATION_VALUE_TRAITS_HPP | |
#define BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP | |
#include <boost/intrusive/link_mode.hpp> | |
#include <boost/pointer_cast.hpp> | |
#include <iterator> | |
namespace boost { | |
namespace intrusive { | |
//!This value traits template is used to create value traits | |
//!from user defined node traits where value_traits::value_type will | |
//!derive from node_traits::node | |
template<class T, class NodeTraits, link_mode_type LinkMode = safe_link> | |
struct derivation_value_traits | |
{ | |
public: | |
typedef NodeTraits node_traits; | |
typedef T value_type; | |
typedef typename node_traits::node node; | |
typedef typename node_traits::node_ptr node_ptr; | |
typedef typename node_traits::const_node_ptr const_node_ptr; | |
typedef typename boost::pointer_to_other<node_ptr, T>::type pointer; | |
typedef typename boost::pointer_to_other<node_ptr, const T>::type const_pointer; | |
typedef typename std::iterator_traits<pointer>::reference reference; | |
typedef typename std::iterator_traits<const_pointer>::reference const_reference; | |
static const link_mode_type link_mode = LinkMode; | |
static node_ptr to_node_ptr(reference value) | |
{ return node_ptr(&value); } | |
static const_node_ptr to_node_ptr(const_reference value) | |
{ return node_ptr(&value); } | |
static pointer to_value_ptr(node_ptr n) | |
{ | |
// This still fails in gcc < 4.4 so forget about it | |
// using ::boost::static_pointer_cast; | |
// return static_pointer_cast<value_type>(n)); | |
return pointer(&static_cast<value_type&>(*n)); | |
} | |
static const_pointer to_value_ptr(const_node_ptr n) | |
{ | |
// This still fails in gcc < 4.4 so forget about it | |
// using ::boost::static_pointer_cast; | |
// return static_pointer_cast<const value_type>(n)); | |
return const_pointer(&static_cast<const value_type&>(*n)); | |
} | |
}; | |
} //namespace intrusive | |
} //namespace boost | |
#endif //BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP |