194 lines
6.8 KiB
C++
194 lines
6.8 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2007-2013
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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_AVLTREE_NODE_HPP
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#define BOOST_INTRUSIVE_AVLTREE_NODE_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/intrusive/detail/config_begin.hpp>
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#include <boost/intrusive/detail/workaround.hpp>
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#include <boost/intrusive/pointer_rebind.hpp>
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#include <boost/intrusive/avltree_algorithms.hpp>
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#include <boost/intrusive/pointer_plus_bits.hpp>
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#include <boost/intrusive/detail/mpl.hpp>
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namespace boost {
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namespace intrusive {
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/////////////////////////////////////////////////////////////////////////////
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// //
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// Generic node_traits for any pointer type //
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// //
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/////////////////////////////////////////////////////////////////////////////
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//This is the compact representation: 3 pointers
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template<class VoidPointer>
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struct compact_avltree_node
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{
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typedef typename pointer_rebind<VoidPointer, compact_avltree_node<VoidPointer> >::type node_ptr;
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typedef typename pointer_rebind<VoidPointer, const compact_avltree_node<VoidPointer> >::type const_node_ptr;
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enum balance { negative_t, zero_t, positive_t };
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node_ptr parent_, left_, right_;
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};
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//This is the normal representation: 3 pointers + enum
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template<class VoidPointer>
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struct avltree_node
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{
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typedef typename pointer_rebind<VoidPointer, avltree_node<VoidPointer> >::type node_ptr;
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typedef typename pointer_rebind<VoidPointer, const avltree_node<VoidPointer> >::type const_node_ptr;
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enum balance { negative_t, zero_t, positive_t };
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node_ptr parent_, left_, right_;
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balance balance_;
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};
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//This is the default node traits implementation
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//using a node with 3 generic pointers plus an enum
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template<class VoidPointer>
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struct default_avltree_node_traits_impl
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{
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typedef avltree_node<VoidPointer> node;
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typedef typename node::node_ptr node_ptr;
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typedef typename node::const_node_ptr const_node_ptr;
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typedef typename node::balance balance;
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_parent(const const_node_ptr & n)
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{ return n->parent_; }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_parent(const node_ptr & n)
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{ return n->parent_; }
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BOOST_INTRUSIVE_FORCEINLINE static void set_parent(const node_ptr & n, const node_ptr & p)
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{ n->parent_ = p; }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_left(const const_node_ptr & n)
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{ return n->left_; }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_left(const node_ptr & n)
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{ return n->left_; }
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BOOST_INTRUSIVE_FORCEINLINE static void set_left(const node_ptr & n, const node_ptr & l)
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{ n->left_ = l; }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_right(const const_node_ptr & n)
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{ return n->right_; }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_right(const node_ptr & n)
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{ return n->right_; }
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BOOST_INTRUSIVE_FORCEINLINE static void set_right(const node_ptr & n, const node_ptr & r)
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{ n->right_ = r; }
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BOOST_INTRUSIVE_FORCEINLINE static balance get_balance(const const_node_ptr & n)
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{ return n->balance_; }
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BOOST_INTRUSIVE_FORCEINLINE static balance get_balance(const node_ptr & n)
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{ return n->balance_; }
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BOOST_INTRUSIVE_FORCEINLINE static void set_balance(const node_ptr & n, balance b)
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{ n->balance_ = b; }
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BOOST_INTRUSIVE_FORCEINLINE static balance negative()
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{ return node::negative_t; }
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BOOST_INTRUSIVE_FORCEINLINE static balance zero()
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{ return node::zero_t; }
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BOOST_INTRUSIVE_FORCEINLINE static balance positive()
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{ return node::positive_t; }
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};
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//This is the compact node traits implementation
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//using a node with 3 generic pointers
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template<class VoidPointer>
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struct compact_avltree_node_traits_impl
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{
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typedef compact_avltree_node<VoidPointer> node;
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typedef typename node::node_ptr node_ptr;
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typedef typename node::const_node_ptr const_node_ptr;
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typedef typename node::balance balance;
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typedef pointer_plus_bits<node_ptr, 2> ptr_bit;
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_parent(const const_node_ptr & n)
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{ return ptr_bit::get_pointer(n->parent_); }
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BOOST_INTRUSIVE_FORCEINLINE static void set_parent(const node_ptr & n, const node_ptr & p)
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{ ptr_bit::set_pointer(n->parent_, p); }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_left(const const_node_ptr & n)
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{ return n->left_; }
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BOOST_INTRUSIVE_FORCEINLINE static void set_left(const node_ptr & n, const node_ptr & l)
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{ n->left_ = l; }
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BOOST_INTRUSIVE_FORCEINLINE static node_ptr get_right(const const_node_ptr & n)
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{ return n->right_; }
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BOOST_INTRUSIVE_FORCEINLINE static void set_right(const node_ptr & n, const node_ptr & r)
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{ n->right_ = r; }
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BOOST_INTRUSIVE_FORCEINLINE static balance get_balance(const const_node_ptr & n)
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{ return (balance)ptr_bit::get_bits(n->parent_); }
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BOOST_INTRUSIVE_FORCEINLINE static void set_balance(const node_ptr & n, balance b)
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{ ptr_bit::set_bits(n->parent_, (std::size_t)b); }
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BOOST_INTRUSIVE_FORCEINLINE static balance negative()
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{ return node::negative_t; }
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BOOST_INTRUSIVE_FORCEINLINE static balance zero()
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{ return node::zero_t; }
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BOOST_INTRUSIVE_FORCEINLINE static balance positive()
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{ return node::positive_t; }
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};
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//Dispatches the implementation based on the boolean
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template<class VoidPointer, bool Compact>
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struct avltree_node_traits_dispatch
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: public default_avltree_node_traits_impl<VoidPointer>
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{};
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template<class VoidPointer>
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struct avltree_node_traits_dispatch<VoidPointer, true>
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: public compact_avltree_node_traits_impl<VoidPointer>
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{};
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//Inherit from rbtree_node_traits_dispatch depending on the embedding capabilities
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template<class VoidPointer, bool OptimizeSize = false>
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struct avltree_node_traits
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: public avltree_node_traits_dispatch
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< VoidPointer
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, OptimizeSize &&
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max_pointer_plus_bits
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< VoidPointer
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, detail::alignment_of<compact_avltree_node<VoidPointer> >::value
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>::value >= 2u
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>
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{};
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} //namespace intrusive
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} //namespace boost
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#include <boost/intrusive/detail/config_end.hpp>
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#endif //BOOST_INTRUSIVE_AVLTREE_NODE_HPP
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