Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of Boost. Click here to view this page for the latest version.

Struct template member_value_traits



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

template<typename T, typename NodeTraits, 
         typename NodeTraits::node T::* PtrToMember, 
         link_mode_type LinkMode = safe_link> 
struct member_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);

  // public data members
  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 store a node_traits::node

member_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);