forked from boostorg/intrusive
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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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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