--- /dev/null
+/* Copyright 2003-2007 Joaquín M López Muñoz.
+ * 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/multi_index for library home page.
+ *
+ * The internal implementation of red-black trees is based on that of SGI STL
+ * stl_tree.h file:
+ *
+ * Copyright (c) 1996,1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_ORD_INDEX_NODE_HPP
+#define BOOST_MULTI_INDEX_DETAIL_ORD_INDEX_NODE_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <cstddef>
+#include <boost/detail/allocator_utilities.hpp>
+#include <boost/multi_index/detail/prevent_eti.hpp>
+
+#if !defined(BOOST_MULTI_INDEX_DISABLE_COMPRESSED_ORDERED_INDEX_NODES)
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/multi_index/detail/uintptr_type.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+#include <boost/type_traits/is_same.hpp>
+#endif
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* definition of red-black nodes for ordered_index */
+
+enum ordered_index_color{red=false,black=true};
+enum ordered_index_side{to_left=false,to_right=true};
+
+template<typename Allocator>
+struct ordered_index_node_impl; /* fwd decl. */
+
+template<typename Allocator>
+struct ordered_index_node_std_base
+{
+ typedef typename prevent_eti<
+ Allocator,
+ typename boost::detail::allocator::rebind_to<
+ Allocator,
+ ordered_index_node_impl<Allocator>
+ >::type
+ >::type::pointer pointer;
+ typedef typename prevent_eti<
+ Allocator,
+ typename boost::detail::allocator::rebind_to<
+ Allocator,
+ ordered_index_node_impl<Allocator>
+ >::type
+ >::type::const_pointer const_pointer;
+ typedef ordered_index_color& color_ref;
+ typedef pointer& parent_ref;
+
+ ordered_index_color& color(){return color_;}
+ ordered_index_color color()const{return color_;}
+ pointer& parent(){return parent_;}
+ pointer parent()const{return parent_;}
+ pointer& left(){return left_;}
+ pointer left()const{return left_;}
+ pointer& right(){return right_;}
+ pointer right()const{return right_;}
+
+private:
+ ordered_index_color color_;
+ pointer parent_;
+ pointer left_;
+ pointer right_;
+};
+
+#if !defined(BOOST_MULTI_INDEX_DISABLE_COMPRESSED_ORDERED_INDEX_NODES)
+/* If ordered_index_node_impl has even alignment, we can use the least
+ * significant bit of one of the ordered_index_node_impl pointers to
+ * store color information. This typically reduces the size of
+ * ordered_index_node_impl by 25%.
+ */
+
+#if defined(BOOST_MSVC)
+/* This code casts pointers to an integer type that has been computed
+ * to be large enough to hold the pointer, however the metaprogramming
+ * logic is not always spotted by the VC++ code analyser that issues a
+ * long list of warnings.
+ */
+
+#pragma warning(push)
+#pragma warning(disable:4312 4311)
+#endif
+
+template<typename Allocator>
+struct ordered_index_node_compressed_base
+{
+ typedef ordered_index_node_impl<Allocator>* pointer;
+ typedef const ordered_index_node_impl<Allocator>* const_pointer;
+
+ struct color_ref
+ {
+ color_ref(uintptr_type* r_):r(r_){}
+
+ operator ordered_index_color()const
+ {
+ return ordered_index_color(*r&uintptr_type(1));
+ }
+
+ color_ref& operator=(ordered_index_color c)
+ {
+ *r&=~uintptr_type(1);
+ *r|=uintptr_type(c);
+ return *this;
+ }
+
+ color_ref& operator=(const color_ref& x)
+ {
+ return operator=(x.operator ordered_index_color());
+ }
+
+ private:
+ uintptr_type* r;
+ };
+
+ struct parent_ref
+ {
+ parent_ref(uintptr_type* r_):r(r_){}
+
+ operator pointer()const
+ {
+ return (pointer)(void*)(*r&~uintptr_type(1));
+ }
+
+ parent_ref& operator=(pointer p)
+ {
+ *r=((uintptr_type)(void*)p)|(*r&uintptr_type(1));
+ return *this;
+ }
+
+ parent_ref& operator=(const parent_ref& x)
+ {
+ return operator=(x.operator pointer());
+ }
+
+ pointer operator->()const
+ {
+ return operator pointer();
+ }
+
+ private:
+ uintptr_type* r;
+ };
+
+ color_ref color(){return color_ref(&parentcolor_);}
+ ordered_index_color color()const
+ {
+ return ordered_index_color(parentcolor_&std::size_t(1ul));
+ }
+
+ parent_ref parent(){return parent_ref(&parentcolor_);}
+ pointer parent()const
+ {
+ return (pointer)(void*)(parentcolor_&~uintptr_type(1));
+ }
+
+ pointer& left(){return left_;}
+ pointer left()const{return left_;}
+ pointer& right(){return right_;}
+ pointer right()const{return right_;}
+
+private:
+ uintptr_type parentcolor_;
+ pointer left_;
+ pointer right_;
+};
+#if defined(BOOST_MSVC)
+#pragma warning(pop)
+#endif
+#endif
+
+template<typename Allocator>
+struct ordered_index_node_impl_base:
+
+#if !defined(BOOST_MULTI_INDEX_DISABLE_COMPRESSED_ORDERED_INDEX_NODES)
+ mpl::if_c<
+ !(has_uintptr_type::value)||
+ (alignment_of<ordered_index_node_compressed_base<Allocator> >::value%2)||
+ !(is_same<
+ typename prevent_eti<
+ Allocator,
+ typename boost::detail::allocator::rebind_to<
+ Allocator,
+ ordered_index_node_impl<Allocator>
+ >::type
+ >::type::pointer,
+ ordered_index_node_impl<Allocator>*>::value),
+ ordered_index_node_std_base<Allocator>,
+ ordered_index_node_compressed_base<Allocator>
+ >::type
+#else
+ ordered_index_node_std_base<Allocator>
+#endif
+
+{};
+
+template<typename Allocator>
+struct ordered_index_node_impl:ordered_index_node_impl_base<Allocator>
+{
+private:
+ typedef ordered_index_node_impl_base<Allocator> super;
+
+public:
+ typedef typename super::color_ref color_ref;
+ typedef typename super::parent_ref parent_ref;
+ typedef typename super::pointer pointer;
+ typedef typename super::const_pointer const_pointer;
+
+ /* interoperability with bidir_node_iterator */
+
+ static void increment(pointer& x)
+ {
+ if(x->right()!=pointer(0)){
+ x=x->right();
+ while(x->left()!=pointer(0))x=x->left();
+ }
+ else{
+ pointer y=x->parent();
+ while(x==y->right()){
+ x=y;
+ y=y->parent();
+ }
+ if(x->right()!=y)x=y;
+ }
+ }
+
+ static void decrement(pointer& x)
+ {
+ if(x->color()==red&&x->parent()->parent()==x){
+ x=x->right();
+ }
+ else if(x->left()!=pointer(0)){
+ pointer y=x->left();
+ while(y->right()!=pointer(0))y=y->right();
+ x=y;
+ }else{
+ pointer y=x->parent();
+ while(x==y->left()){
+ x=y;
+ y=y->parent();
+ }
+ x=y;
+ }
+ }
+
+ /* algorithmic stuff */
+
+ static void rotate_left(pointer x,parent_ref root)
+ {
+ pointer y=x->right();
+ x->right()=y->left();
+ if(y->left()!=pointer(0))y->left()->parent()=x;
+ y->parent()=x->parent();
+
+ if(x==root) root=y;
+ else if(x==x->parent()->left())x->parent()->left()=y;
+ else x->parent()->right()=y;
+ y->left()=x;
+ x->parent()=y;
+ }
+
+ static pointer minimum(pointer x)
+ {
+ while(x->left()!=pointer(0))x=x->left();
+ return x;
+ }
+
+ static pointer maximum(pointer x)
+ {
+ while(x->right()!=pointer(0))x=x->right();
+ return x;
+ }
+
+ static void rotate_right(pointer x,parent_ref root)
+ {
+ pointer y=x->left();
+ x->left()=y->right();
+ if(y->right()!=pointer(0))y->right()->parent()=x;
+ y->parent()=x->parent();
+
+ if(x==root) root=y;
+ else if(x==x->parent()->right())x->parent()->right()=y;
+ else x->parent()->left()=y;
+ y->right()=x;
+ x->parent()=y;
+ }
+
+ static void rebalance(pointer x,parent_ref root)
+ {
+ x->color()=red;
+ while(x!=root&&x->parent()->color()==red){
+ if(x->parent()==x->parent()->parent()->left()){
+ pointer y=x->parent()->parent()->right();
+ if(y!=pointer(0)&&y->color()==red){
+ x->parent()->color()=black;
+ y->color()=black;
+ x->parent()->parent()->color()=red;
+ x=x->parent()->parent();
+ }
+ else{
+ if(x==x->parent()->right()){
+ x=x->parent();
+ rotate_left(x,root);
+ }
+ x->parent()->color()=black;
+ x->parent()->parent()->color()=red;
+ rotate_right(x->parent()->parent(),root);
+ }
+ }
+ else{
+ pointer y=x->parent()->parent()->left();
+ if(y!=pointer(0)&&y->color()==red){
+ x->parent()->color()=black;
+ y->color()=black;
+ x->parent()->parent()->color()=red;
+ x=x->parent()->parent();
+ }
+ else{
+ if(x==x->parent()->left()){
+ x=x->parent();
+ rotate_right(x,root);
+ }
+ x->parent()->color()=black;
+ x->parent()->parent()->color()=red;
+ rotate_left(x->parent()->parent(),root);
+ }
+ }
+ }
+ root->color()=black;
+ }
+
+ static void link(
+ pointer x,ordered_index_side side,pointer position,pointer header)
+ {
+ if(side==to_left){
+ position->left()=x; /* also makes leftmost=x when parent==header */
+ if(position==header){
+ header->parent()=x;
+ header->right()=x;
+ }
+ else if(position==header->left()){
+ header->left()=x; /* maintain leftmost pointing to min node */
+ }
+ }
+ else{
+ position->right()=x;
+ if(position==header->right()){
+ header->right()=x; /* maintain rightmost pointing to max node */
+ }
+ }
+ x->parent()=position;
+ x->left()=pointer(0);
+ x->right()=pointer(0);
+ ordered_index_node_impl::rebalance(x,header->parent());
+ }
+
+ static pointer rebalance_for_erase(
+ pointer z,parent_ref root,pointer& leftmost,pointer& rightmost)
+ {
+ pointer y=z;
+ pointer x=pointer(0);
+ pointer x_parent=pointer(0);
+ if(y->left()==pointer(0)){ /* z has at most one non-null child. y==z. */
+ x=y->right(); /* x might be null */
+ }
+ else{
+ if(y->right()==pointer(0)){ /* z has exactly one non-null child. y==z. */
+ x=y->left(); /* x is not null */
+ }
+ else{ /* z has two non-null children. Set y to */
+ y=y->right(); /* z's successor. x might be null. */
+ while(y->left()!=pointer(0))y=y->left();
+ x=y->right();
+ }
+ }
+ if(y!=z){
+ z->left()->parent()=y; /* relink y in place of z. y is z's successor */
+ y->left()=z->left();
+ if(y!=z->right()){
+ x_parent=y->parent();
+ if(x!=pointer(0))x->parent()=y->parent();
+ y->parent()->left()=x; /* y must be a child of left */
+ y->right()=z->right();
+ z->right()->parent()=y;
+ }
+ else{
+ x_parent=y;
+ }
+
+ if(root==z) root=y;
+ else if(z->parent()->left()==z)z->parent()->left()=y;
+ else z->parent()->right()=y;
+ y->parent()=z->parent();
+ ordered_index_color c=y->color();
+ y->color()=z->color();
+ z->color()=c;
+ y=z; /* y now points to node to be actually deleted */
+ }
+ else{ /* y==z */
+ x_parent=y->parent();
+ if(x!=pointer(0))x->parent()=y->parent();
+ if(root==z){
+ root=x;
+ }
+ else{
+ if(z->parent()->left()==z)z->parent()->left()=x;
+ else z->parent()->right()=x;
+ }
+ if(leftmost==z){
+ if(z->right()==pointer(0)){ /* z->left() must be null also */
+ leftmost=z->parent();
+ }
+ else{
+ leftmost=minimum(x); /* makes leftmost==header if z==root */
+ }
+ }
+ if(rightmost==z){
+ if(z->left()==pointer(0)){ /* z->right() must be null also */
+ rightmost=z->parent();
+ }
+ else{ /* x==z->left() */
+ rightmost=maximum(x); /* makes rightmost==header if z==root */
+ }
+ }
+ }
+ if(y->color()!=red){
+ while(x!=root&&(x==pointer(0)|| x->color()==black)){
+ if(x==x_parent->left()){
+ pointer w=x_parent->right();
+ if(w->color()==red){
+ w->color()=black;
+ x_parent->color()=red;
+ rotate_left(x_parent,root);
+ w=x_parent->right();
+ }
+ if((w->left()==pointer(0)||w->left()->color()==black) &&
+ (w->right()==pointer(0)||w->right()->color()==black)){
+ w->color()=red;
+ x=x_parent;
+ x_parent=x_parent->parent();
+ }
+ else{
+ if(w->right()==pointer(0 )
+ || w->right()->color()==black){
+ if(w->left()!=pointer(0)) w->left()->color()=black;
+ w->color()=red;
+ rotate_right(w,root);
+ w=x_parent->right();
+ }
+ w->color()=x_parent->color();
+ x_parent->color()=black;
+ if(w->right()!=pointer(0))w->right()->color()=black;
+ rotate_left(x_parent,root);
+ break;
+ }
+ }
+ else{ /* same as above,with right <-> left */
+ pointer w=x_parent->left();
+ if(w->color()==red){
+ w->color()=black;
+ x_parent->color()=red;
+ rotate_right(x_parent,root);
+ w=x_parent->left();
+ }
+ if((w->right()==pointer(0)||w->right()->color()==black) &&
+ (w->left()==pointer(0)||w->left()->color()==black)){
+ w->color()=red;
+ x=x_parent;
+ x_parent=x_parent->parent();
+ }
+ else{
+ if(w->left()==pointer(0)||w->left()->color()==black){
+ if(w->right()!=pointer(0))w->right()->color()=black;
+ w->color()=red;
+ rotate_left(w,root);
+ w=x_parent->left();
+ }
+ w->color()=x_parent->color();
+ x_parent->color()=black;
+ if(w->left()!=pointer(0))w->left()->color()=black;
+ rotate_right(x_parent,root);
+ break;
+ }
+ }
+ }
+ if(x!=pointer(0))x->color()=black;
+ }
+ return y;
+ }
+
+ static void restore(pointer x,pointer position,pointer header)
+ {
+ if(position->left()==pointer(0)||position->left()==header){
+ link(x,to_left,position,header);
+ }
+ else{
+ decrement(position);
+ link(x,to_right,position,header);
+ }
+ }
+
+#if defined(BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING)
+ /* invariant stuff */
+
+ static std::size_t black_count(pointer node,pointer root)
+ {
+ if(node==pointer(0))return 0;
+ std::size_t sum=0;
+ for(;;){
+ if(node->color()==black)++sum;
+ if(node==root)break;
+ node=node->parent();
+ }
+ return sum;
+ }
+#endif
+};
+
+template<typename Super>
+struct ordered_index_node_trampoline:
+ prevent_eti<
+ Super,
+ ordered_index_node_impl<
+ typename boost::detail::allocator::rebind_to<
+ typename Super::allocator_type,
+ void
+ >::type
+ >
+ >::type
+{
+ typedef typename prevent_eti<
+ Super,
+ ordered_index_node_impl<
+ typename boost::detail::allocator::rebind_to<
+ typename Super::allocator_type,
+ void
+ >::type
+ >
+ >::type impl_type;
+};
+
+template<typename Super>
+struct ordered_index_node:Super,ordered_index_node_trampoline<Super>
+{
+private:
+ typedef ordered_index_node_trampoline<Super> trampoline;
+
+public:
+ typedef typename trampoline::impl_type impl_type;
+ typedef typename trampoline::color_ref impl_color_ref;
+ typedef typename trampoline::parent_ref impl_parent_ref;
+ typedef typename trampoline::pointer impl_pointer;
+ typedef typename trampoline::const_pointer const_impl_pointer;
+
+ impl_color_ref color(){return trampoline::color();}
+ ordered_index_color color()const{return trampoline::color();}
+ impl_parent_ref parent(){return trampoline::parent();}
+ impl_pointer parent()const{return trampoline::parent();}
+ impl_pointer& left(){return trampoline::left();}
+ impl_pointer left()const{return trampoline::left();}
+ impl_pointer& right(){return trampoline::right();}
+ impl_pointer right()const{return trampoline::right();}
+
+ impl_pointer impl()
+ {
+ return static_cast<impl_pointer>(
+ static_cast<impl_type*>(static_cast<trampoline*>(this)));
+ }
+
+ const_impl_pointer impl()const
+ {
+ return static_cast<const_impl_pointer>(
+ static_cast<const impl_type*>(static_cast<const trampoline*>(this)));
+ }
+
+ static ordered_index_node* from_impl(impl_pointer x)
+ {
+ return static_cast<ordered_index_node*>(
+ static_cast<trampoline*>(&*x));
+ }
+
+ static const ordered_index_node* from_impl(const_impl_pointer x)
+ {
+ return static_cast<const ordered_index_node*>(
+ static_cast<const trampoline*>(&*x));
+ }
+
+ /* interoperability with bidir_node_iterator */
+
+ static void increment(ordered_index_node*& x)
+ {
+ impl_pointer xi=x->impl();
+ trampoline::increment(xi);
+ x=from_impl(xi);
+ }
+
+ static void decrement(ordered_index_node*& x)
+ {
+ impl_pointer xi=x->impl();
+ trampoline::decrement(xi);
+ x=from_impl(xi);
+ }
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif
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