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67 lines
2.5 KiB
67 lines
2.5 KiB
///////////////////////////////////////////////////////////////////////////// |
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// |
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// (C) Copyright Ion Gaztanaga 2006-2009 |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/intrusive for documentation. |
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// |
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///////////////////////////////////////////////////////////////////////////// |
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#ifndef BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP |
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#define BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP |
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#include <boost/intrusive/link_mode.hpp> |
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#include <boost/pointer_cast.hpp> |
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#include <iterator> |
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namespace boost { |
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namespace intrusive { |
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//!This value traits template is used to create value traits |
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//!from user defined node traits where value_traits::value_type will |
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//!derive from node_traits::node |
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template<class T, class NodeTraits, link_mode_type LinkMode = safe_link> |
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struct derivation_value_traits |
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{ |
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public: |
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typedef NodeTraits node_traits; |
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typedef T value_type; |
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typedef typename node_traits::node node; |
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typedef typename node_traits::node_ptr node_ptr; |
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typedef typename node_traits::const_node_ptr const_node_ptr; |
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typedef typename boost::pointer_to_other<node_ptr, T>::type pointer; |
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typedef typename boost::pointer_to_other<node_ptr, const T>::type const_pointer; |
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typedef typename std::iterator_traits<pointer>::reference reference; |
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typedef typename std::iterator_traits<const_pointer>::reference const_reference; |
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static const link_mode_type link_mode = LinkMode; |
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static node_ptr to_node_ptr(reference value) |
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{ return node_ptr(&value); } |
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static const_node_ptr to_node_ptr(const_reference value) |
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{ return node_ptr(&value); } |
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static pointer to_value_ptr(node_ptr n) |
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{ |
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// This still fails in gcc < 4.4 so forget about it |
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// using ::boost::static_pointer_cast; |
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// return static_pointer_cast<value_type>(n)); |
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return pointer(&static_cast<value_type&>(*n)); |
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} |
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static const_pointer to_value_ptr(const_node_ptr n) |
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{ |
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// This still fails in gcc < 4.4 so forget about it |
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// using ::boost::static_pointer_cast; |
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// return static_pointer_cast<const value_type>(n)); |
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return const_pointer(&static_cast<const value_type&>(*n)); |
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} |
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}; |
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} //namespace intrusive |
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} //namespace boost |
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#endif //BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP
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