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Diffstat (limited to 'boost/intrusive/derivation_value_traits.hpp')
| -rw-r--r-- | boost/intrusive/derivation_value_traits.hpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/boost/intrusive/derivation_value_traits.hpp b/boost/intrusive/derivation_value_traits.hpp new file mode 100644 index 0000000000..38c5aa57cf --- /dev/null +++ b/boost/intrusive/derivation_value_traits.hpp @@ -0,0 +1,70 @@ +///////////////////////////////////////////////////////////////////////////// +// +// (C) Copyright Ion Gaztanaga 2006-2009 +// +// Distributed under the Boost Software License, Version 1.0. +// (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) +// +// See http://www.boost.org/libs/intrusive for documentation. +// +///////////////////////////////////////////////////////////////////////////// + +#ifndef BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP +#define BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP + +#include <boost/intrusive/link_mode.hpp> +#include <boost/pointer_cast.hpp> +#include <boost/pointer_to_other.hpp> +#include <iterator> + +namespace boost { +namespace intrusive { + +//!This value traits template is used to create value traits +//!from user defined node traits where value_traits::value_type will +//!derive from node_traits::node +template<class T, class NodeTraits, link_mode_type LinkMode = safe_link> +struct derivation_value_traits +{ + public: + typedef NodeTraits node_traits; + typedef T value_type; + typedef typename node_traits::node node; + typedef typename node_traits::node_ptr node_ptr; + typedef typename node_traits::const_node_ptr const_node_ptr; + typedef typename boost::pointer_to_other<node_ptr, T>::type pointer; + typedef typename boost::pointer_to_other<node_ptr, const T>::type const_pointer; + typedef typename boost::intrusive:: + pointer_traits<pointer>::reference reference; + typedef typename boost::intrusive:: + pointer_traits<const_pointer>::reference const_reference; + static const link_mode_type link_mode = LinkMode; + + static node_ptr to_node_ptr(reference value) + { return node_ptr(&value); } + + static const_node_ptr to_node_ptr(const_reference value) + { return node_ptr(&value); } + + static pointer to_value_ptr(const node_ptr &n) + { +// This still fails in gcc < 4.4 so forget about it +// using ::boost::static_pointer_cast; +// return static_pointer_cast<value_type>(n)); + return pointer(&static_cast<value_type&>(*n)); + } + + static const_pointer to_value_ptr(const const_node_ptr &n) + { +// This still fails in gcc < 4.4 so forget about it +// using ::boost::static_pointer_cast; +// return static_pointer_cast<const value_type>(n)); + return const_pointer(&static_cast<const value_type&>(*n)); + } +}; + +} //namespace intrusive +} //namespace boost + +#endif //BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP |