Struct template member_value_traits

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## Struct template member_value_traits

boost::intrusive::member_value_traits

## Synopsis

    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) ;
      static const link_mode_type link_mode;
    };

## Description

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) ;