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1 /////////////////////////////////////////////////////////////////////////////
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2 //
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3 // (C) Copyright Ion Gaztanaga 2006-2013
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4 //
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5 // Distributed under the Boost Software License, Version 1.0.
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6 // (See accompanying file LICENSE_1_0.txt or copy at
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7 // http://www.boost.org/LICENSE_1_0.txt)
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8 //
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9 // See http://www.boost.org/libs/intrusive for documentation.
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10 //
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11 /////////////////////////////////////////////////////////////////////////////
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12
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13 #ifndef BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP
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14 #define BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP
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15
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16 #include <boost/intrusive/detail/config_begin.hpp>
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17 #include <boost/intrusive/intrusive_fwd.hpp>
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18 #include <boost/intrusive/link_mode.hpp>
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19 #include <boost/intrusive/pointer_traits.hpp>
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20
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21 #if defined(BOOST_HAS_PRAGMA_ONCE)
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22 # pragma once
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23 #endif
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24
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25 namespace boost {
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26 namespace intrusive {
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27
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28 //!This value traits template is used to create value traits
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29 //!from user defined node traits where value_traits::value_type will
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30 //!derive from node_traits::node
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31
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32 template<class T, class NodeTraits, link_mode_type LinkMode
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33 #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
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34 = safe_link
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35 #endif
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36 >
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37 struct derivation_value_traits
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38 {
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39 public:
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40 typedef NodeTraits node_traits;
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41 typedef T value_type;
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42 typedef typename node_traits::node node;
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43 typedef typename node_traits::node_ptr node_ptr;
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44 typedef typename node_traits::const_node_ptr const_node_ptr;
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45 typedef typename pointer_traits<node_ptr>::
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46 template rebind_pointer<value_type>::type pointer;
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47 typedef typename pointer_traits<node_ptr>::
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48 template rebind_pointer<const value_type>::type const_pointer;
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49 typedef typename boost::intrusive::
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50 pointer_traits<pointer>::reference reference;
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51 typedef typename boost::intrusive::
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52 pointer_traits<const_pointer>::reference const_reference;
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53 static const link_mode_type link_mode = LinkMode;
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54
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55 static node_ptr to_node_ptr(reference value)
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56 { return node_ptr(&value); }
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57
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58 static const_node_ptr to_node_ptr(const_reference value)
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59 { return node_ptr(&value); }
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60
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61 static pointer to_value_ptr(const node_ptr &n)
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62 {
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63 return pointer_traits<pointer>::pointer_to(static_cast<reference>(*n));
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64 }
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65
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66 static const_pointer to_value_ptr(const const_node_ptr &n)
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67 {
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68 return pointer_traits<pointer>::pointer_to(static_cast<const_reference>(*n));
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69 }
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70 };
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71
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72 } //namespace intrusive
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73 } //namespace boost
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74
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75 #include <boost/intrusive/detail/config_end.hpp>
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76
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77 #endif //BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP
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