text: /////////////////////////////////////////////////////////////////////////////
  //
  // (C) Copyright Ion Gaztanaga  2006-2013
  //
  // 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_MEMBER_VALUE_TRAITS_HPP
  #define BOOST_INTRUSIVE_MEMBER_VALUE_TRAITS_HPP
  
  #include <boost/intrusive/detail/config_begin.hpp>
  #include <boost/intrusive/intrusive_fwd.hpp>
  
  #include <boost/intrusive/link_mode.hpp>
  #include <boost/intrusive/detail/parent_from_member.hpp>
  #include <boost/intrusive/detail/to_raw_pointer.hpp> 
  #include <boost/intrusive/pointer_traits.hpp>
  
  #if defined(BOOST_HAS_PRAGMA_ONCE)
  #  pragma once
  #endif
  
  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
  //!store a node_traits::node
  template< class T, class NodeTraits
          , typename NodeTraits::node T::* PtrToMember
          , link_mode_type LinkMode
     #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
     = safe_link
     #endif
  >
  struct member_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 pointer_traits<node_ptr>                                     node_ptr_traits;
     typedef typename pointer_traits<node_ptr>::template
        rebind_pointer<T>::type                                           pointer;
     typedef typename pointer_traits<node_ptr>::template
        rebind_pointer<const T>::type                                     const_pointer;
     //typedef typename pointer_traits<pointer>::reference                  reference;
     //typedef typename pointer_traits<const_pointer>::reference            const_reference;
     typedef value_type &                                                 reference;
     typedef const value_type &                                           const_reference;
     static const link_mode_type link_mode = LinkMode;
  
     BOOST_INTRUSIVE_FORCEINLINE static node_ptr to_node_ptr(reference value)
     {  return pointer_traits<node_ptr>::pointer_to(value.*PtrToMember);   }
  
     BOOST_INTRUSIVE_FORCEINLINE static const_node_ptr to_node_ptr(const_reference value)
     {  return pointer_traits<const_node_ptr>::pointer_to(value.*PtrToMember);   }
  
     BOOST_INTRUSIVE_FORCEINLINE static pointer to_value_ptr(const node_ptr &n)
     {
        return pointer_traits<pointer>::pointer_to(*detail::parent_from_member<value_type, node>
           (boost::intrusive::detail::to_raw_pointer(n), PtrToMember));
     }
  
     BOOST_INTRUSIVE_FORCEINLINE static const_pointer to_value_ptr(const const_node_ptr &n)
     {
        return pointer_traits<const_pointer>::pointer_to(*detail::parent_from_member<value_type, node>
           (boost::intrusive::detail::to_raw_pointer(n), PtrToMember));
  
     }
  };
  
  } //namespace intrusive
  } //namespace boost
  
  #include <boost/intrusive/detail/config_end.hpp>
  
  #endif //BOOST_INTRUSIVE_MEMBER_VALUE_TRAITS_HPP
  