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Struct template derivation_value_traits



// In header: <boost/intrusive/derivation_value_traits.hpp>

template<typename T, typename NodeTraits, link_mode_type LinkMode = safe_link> 
struct derivation_value_traits {
  // types
  typedef NodeTraits                                         node_traits;    
  typedef T                                                  value_type;     
  typedef node_traits::node                                  node;           
  typedef node_traits::node_ptr                              node_ptr;       
  typedef node_traits::const_node_ptr                        const_node_ptr; 
  typedef boost::pointer_to_other< node_ptr, T >::type       pointer;        
  typedef boost::pointer_to_other< node_ptr, const T >::type const_pointer;  
  typedef std::iterator_traits< pointer >::reference         reference;      
  typedef std::iterator_traits< const_pointer >::reference   const_reference;

  // public static functions
  static node_ptr to_node_ptr(reference) ;
  static const_node_ptr to_node_ptr(const_reference) ;
  static pointer to_value_ptr(node_ptr) ;
  static const_pointer to_value_ptr(const_node_ptr) ;
  static const link_mode_type link_mode;


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

derivation_value_traits public static functions

  1. static node_ptr to_node_ptr(reference value) ;
  2. static const_node_ptr to_node_ptr(const_reference value) ;
  3. static pointer to_value_ptr(node_ptr n) ;
  4. static const_pointer to_value_ptr(const_node_ptr n) ;