mirror of
https://github.com/s1lentq/ReGameDLL_CS.git
synced 2024-12-27 23:25:41 +03:00
1296 lines
32 KiB
C++
1296 lines
32 KiB
C++
//=========== (C) Copyright 1999 Valve, L.L.C. All rights reserved. ===========
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//
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// The copyright to the contents herein is the property of Valve, L.L.C.
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// The contents may be used and/or copied only with the written permission of
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// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
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// the agreement/contract under which the contents have been supplied.
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//
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// Purpose:
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//
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// $Header: $
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// $NoKeywords: $
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//=============================================================================
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#ifndef UTLRBTREE_H
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#define UTLRBTREE_H
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//#include <assert.h>
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#include "utlmemory.h"
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//-----------------------------------------------------------------------------
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// Tool to generate a default compare function for any type that implements
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// operator<, including all simple types
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//-----------------------------------------------------------------------------
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template <typename T >
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class CDefOps
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{
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public:
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static bool LessFunc( const T &lhs, const T &rhs ) { return ( lhs < rhs ); }
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};
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#define DefLessFunc( type ) CDefOps<type>::LessFunc
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//-------------------------------------
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inline bool StringLessThan( const char * const &lhs, const char * const &rhs) { return ( strcmp( lhs, rhs) < 0 ); }
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inline bool CaselessStringLessThan( const char * const &lhs, const char * const &rhs ) { return ( _stricmp( lhs, rhs) < 0 ); }
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//-------------------------------------
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// inline these two templates to stop multiple definitions of the same code
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template <> inline bool CDefOps<const char *>::LessFunc( const char * const &lhs, const char * const &rhs ) { return StringLessThan( lhs, rhs ); }
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template <> inline bool CDefOps<char *>::LessFunc( char * const &lhs, char * const &rhs ) { return StringLessThan( lhs, rhs ); }
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//-------------------------------------
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template <typename RBTREE_T>
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void SetDefLessFunc( RBTREE_T &RBTree )
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{
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#ifdef _WIN32
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RBTree.SetLessFunc( DefLessFunc( RBTREE_T::KeyType_t ) );
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#elif _LINUX
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RBTree.SetLessFunc( DefLessFunc( typename RBTREE_T::KeyType_t ) );
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#endif
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}
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//-----------------------------------------------------------------------------
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// A red-black binary search tree
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//-----------------------------------------------------------------------------
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template <class T, class I = unsigned short>
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class CUtlRBTree
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{
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public:
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// Less func typedef
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// Returns true if the first parameter is "less" than the second
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typedef bool (*LessFunc_t)( T const &, T const & );
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typedef T KeyType_t;
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typedef T ElemType_t;
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typedef I IndexType_t;
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// constructor, destructor
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// Left at growSize = 0, the memory will first allocate 1 element and double in size
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// at each increment.
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// LessFunc_t is required, but may be set after the constructor using SetLessFunc() below
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CUtlRBTree( int growSize = 0, int initSize = 0, LessFunc_t lessfunc = 0 );
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~CUtlRBTree( );
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// gets particular elements
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T& Element( I i );
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T const &Element( I i ) const;
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T& operator[]( I i );
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T const &operator[]( I i ) const;
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// Gets the root
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I Root() const;
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// Num elements
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unsigned int Count() const;
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// Max "size" of the vector
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I MaxElement() const;
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// Gets the children
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I Parent( I i ) const;
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I LeftChild( I i ) const;
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I RightChild( I i ) const;
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// Tests if a node is a left or right child
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bool IsLeftChild( I i ) const;
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bool IsRightChild( I i ) const;
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// Tests if root or leaf
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bool IsRoot( I i ) const;
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bool IsLeaf( I i ) const;
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// Checks if a node is valid and in the tree
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bool IsValidIndex( I i ) const;
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// Checks if the tree as a whole is valid
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bool IsValid() const;
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// Invalid index
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static I InvalidIndex();
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// returns the tree depth (not a very fast operation)
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int Depth( I node ) const;
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int Depth() const;
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// Sets the less func
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void SetLessFunc( LessFunc_t func );
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// Allocation method
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I NewNode();
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// Insert method (inserts in order)
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I Insert( T const &insert );
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void Insert( const T *pArray, int nItems );
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// Find method
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I Find( T const &search ) const;
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// Remove methods
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void RemoveAt( I i );
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bool Remove( T const &remove );
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void RemoveAll( );
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// Allocation, deletion
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void FreeNode( I i );
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// Iteration
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I FirstInorder() const;
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I NextInorder( I i ) const;
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I PrevInorder( I i ) const;
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I LastInorder() const;
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I FirstPreorder() const;
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I NextPreorder( I i ) const;
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I PrevPreorder( I i ) const;
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I LastPreorder( ) const;
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I FirstPostorder() const;
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I NextPostorder( I i ) const;
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// If you change the search key, this can be used to reinsert the
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// element into the tree.
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void Reinsert( I elem );
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protected:
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enum NodeColor_t
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{
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RED = 0,
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BLACK
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};
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struct Links_t
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{
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I m_Left;
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I m_Right;
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I m_Parent;
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I m_Tag;
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};
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struct Node_t : public Links_t
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{
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T m_Data;
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};
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// Sets the children
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void SetParent( I i, I parent );
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void SetLeftChild( I i, I child );
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void SetRightChild( I i, I child );
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void LinkToParent( I i, I parent, bool isLeft );
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// Gets at the links
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Links_t const &Links( I i ) const;
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Links_t &Links( I i );
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// Checks if a link is red or black
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bool IsRed( I i ) const;
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bool IsBlack( I i ) const;
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// Sets/gets node color
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NodeColor_t Color( I i ) const;
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void SetColor( I i, NodeColor_t c );
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// operations required to preserve tree balance
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void RotateLeft(I i);
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void RotateRight(I i);
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void InsertRebalance(I i);
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void RemoveRebalance(I i);
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// Insertion, removal
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I InsertAt( I parent, bool leftchild );
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// copy constructors not allowed
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CUtlRBTree( CUtlRBTree<T, I> const &tree );
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// Inserts a node into the tree, doesn't copy the data in.
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void FindInsertionPosition( T const &insert, I &parent, bool &leftchild );
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// Remove and add back an element in the tree.
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void Unlink( I elem );
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void Link( I elem );
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// Used for sorting.
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LessFunc_t m_LessFunc;
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CUtlMemory<Node_t> m_Elements;
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I m_Root;
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I m_NumElements;
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I m_FirstFree;
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I m_TotalElements;
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Node_t* m_pElements;
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void ResetDbgInfo()
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{
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m_pElements = (Node_t*)m_Elements.Base();
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}
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};
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//-----------------------------------------------------------------------------
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// constructor, destructor
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//-----------------------------------------------------------------------------
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template <class T, class I>
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CUtlRBTree<T, I>::CUtlRBTree( int growSize, int initSize, LessFunc_t lessfunc ) :
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m_Elements( growSize, initSize ),
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m_LessFunc( lessfunc ),
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m_Root( InvalidIndex() ),
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m_NumElements( 0 ), m_TotalElements( 0 ),
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m_FirstFree( InvalidIndex() )
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{
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ResetDbgInfo();
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}
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template <class T, class I>
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CUtlRBTree<T, I>::~CUtlRBTree()
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{
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}
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//-----------------------------------------------------------------------------
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// gets particular elements
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline T &CUtlRBTree<T, I>::Element( I i )
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{
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return m_Elements[i].m_Data;
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}
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template <class T, class I>
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inline T const &CUtlRBTree<T, I>::Element( I i ) const
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{
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return m_Elements[i].m_Data;
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}
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template <class T, class I>
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inline T &CUtlRBTree<T, I>::operator[]( I i )
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{
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return Element(i);
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}
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template <class T, class I>
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inline T const &CUtlRBTree<T, I>::operator[]( I i ) const
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{
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return Element(i);
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}
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//-----------------------------------------------------------------------------
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//
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// various accessors
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//
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Gets the root
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline I CUtlRBTree<T, I>::Root() const
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{
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return m_Root;
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}
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//-----------------------------------------------------------------------------
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// Num elements
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline unsigned int CUtlRBTree<T, I>::Count() const
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{
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return (unsigned int)m_NumElements;
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}
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//-----------------------------------------------------------------------------
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// Max "size" of the vector
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline I CUtlRBTree<T, I>::MaxElement() const
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{
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return (I)m_TotalElements;
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}
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//-----------------------------------------------------------------------------
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// Gets the children
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline I CUtlRBTree<T, I>::Parent( I i ) const
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{
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return Links(i).m_Parent;
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}
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template <class T, class I>
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inline I CUtlRBTree<T, I>::LeftChild( I i ) const
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{
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return Links(i).m_Left;
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}
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template <class T, class I>
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inline I CUtlRBTree<T, I>::RightChild( I i ) const
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{
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return Links(i).m_Right;
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}
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//-----------------------------------------------------------------------------
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// Tests if a node is a left or right child
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsLeftChild( I i ) const
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{
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return LeftChild(Parent(i)) == i;
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}
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsRightChild( I i ) const
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{
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return RightChild(Parent(i)) == i;
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}
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//-----------------------------------------------------------------------------
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// Tests if root or leaf
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsRoot( I i ) const
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{
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return i == m_Root;
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}
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsLeaf( I i ) const
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{
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return (LeftChild(i) == InvalidIndex()) && (RightChild(i) == InvalidIndex());
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}
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//-----------------------------------------------------------------------------
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// Checks if a node is valid and in the tree
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsValidIndex( I i ) const
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{
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return LeftChild(i) != i;
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}
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//-----------------------------------------------------------------------------
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// Invalid index
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//-----------------------------------------------------------------------------
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template <class T, class I>
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I CUtlRBTree<T, I>::InvalidIndex()
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{
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return (I)~0;
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}
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//-----------------------------------------------------------------------------
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// returns the tree depth (not a very fast operation)
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline int CUtlRBTree<T, I>::Depth() const
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{
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return Depth(Root());
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}
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//-----------------------------------------------------------------------------
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// Sets the children
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline void CUtlRBTree<T, I>::SetParent( I i, I parent )
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{
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Links(i).m_Parent = parent;
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}
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template <class T, class I>
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inline void CUtlRBTree<T, I>::SetLeftChild( I i, I child )
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{
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Links(i).m_Left = child;
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}
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template <class T, class I>
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inline void CUtlRBTree<T, I>::SetRightChild( I i, I child )
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{
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Links(i).m_Right = child;
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}
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//-----------------------------------------------------------------------------
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// Gets at the links
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline typename CUtlRBTree<T, I>::Links_t const &CUtlRBTree<T, I>::Links( I i ) const
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{
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// Sentinel node, makes life easier
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static Links_t s_Sentinel =
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{
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InvalidIndex(), InvalidIndex(), InvalidIndex(), CUtlRBTree<T, I>::BLACK
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};
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return (i != InvalidIndex()) ? *(Links_t*)&m_Elements[i] :
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*(Links_t*)&s_Sentinel;
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}
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template <class T, class I>
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inline typename CUtlRBTree<T, I>::Links_t &CUtlRBTree<T, I>::Links( I i )
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{
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Assert(i != InvalidIndex());
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return *(Links_t *)&m_Elements[i];
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}
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//-----------------------------------------------------------------------------
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// Checks if a link is red or black
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsRed( I i ) const
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{
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return (Links(i).m_Tag == RED);
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}
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template <class T, class I>
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inline bool CUtlRBTree<T, I>::IsBlack( I i ) const
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{
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return (Links(i).m_Tag == BLACK);
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}
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//-----------------------------------------------------------------------------
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// Sets/gets node color
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//-----------------------------------------------------------------------------
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template <class T, class I>
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inline typename CUtlRBTree<T, I>::NodeColor_t CUtlRBTree<T, I>::Color( I i ) const
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{
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return (NodeColor_t)Links(i).m_Tag;
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}
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template <class T, class I>
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inline void CUtlRBTree<T, I>::SetColor( I i, typename CUtlRBTree<T, I>::NodeColor_t c )
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{
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Links(i).m_Tag = (I)c;
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}
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//-----------------------------------------------------------------------------
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// Allocates/ deallocates nodes
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//-----------------------------------------------------------------------------
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template <class T, class I>
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I CUtlRBTree<T, I>::NewNode()
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{
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I newElem;
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// Nothing in the free list; add.
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if (m_FirstFree == InvalidIndex())
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{
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if (m_Elements.NumAllocated() == m_TotalElements)
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m_Elements.Grow();
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newElem = m_TotalElements++;
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}
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else
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{
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newElem = m_FirstFree;
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m_FirstFree = RightChild(m_FirstFree);
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}
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#ifdef _DEBUG
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// reset links to invalid....
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Links_t &node = Links(newElem);
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node.m_Left = node.m_Right = node.m_Parent = InvalidIndex();
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#endif
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Construct( &Element(newElem) );
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ResetDbgInfo();
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return newElem;
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}
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template <class T, class I>
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void CUtlRBTree<T, I>::FreeNode( I i )
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{
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Assert( IsValidIndex(i) && (i != InvalidIndex()) );
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Destruct( &Element(i) );
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SetLeftChild( i, i ); // indicates it's in not in the tree
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SetRightChild( i, m_FirstFree );
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m_FirstFree = i;
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}
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//-----------------------------------------------------------------------------
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// Rotates node i to the left
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//-----------------------------------------------------------------------------
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template <class T, class I>
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void CUtlRBTree<T, I>::RotateLeft(I elem)
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{
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I rightchild = RightChild(elem);
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SetRightChild( elem, LeftChild(rightchild) );
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if (LeftChild(rightchild) != InvalidIndex())
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SetParent( LeftChild(rightchild), elem );
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if (rightchild != InvalidIndex())
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SetParent( rightchild, Parent(elem) );
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if (!IsRoot(elem))
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{
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if (IsLeftChild(elem))
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SetLeftChild( Parent(elem), rightchild );
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else
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SetRightChild( Parent(elem), rightchild );
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}
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else
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m_Root = rightchild;
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SetLeftChild( rightchild, elem );
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if (elem != InvalidIndex())
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SetParent( elem, rightchild );
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}
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//-----------------------------------------------------------------------------
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// Rotates node i to the right
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//-----------------------------------------------------------------------------
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template <class T, class I>
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void CUtlRBTree<T, I>::RotateRight(I elem)
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{
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I leftchild = LeftChild(elem);
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SetLeftChild( elem, RightChild(leftchild) );
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if (RightChild(leftchild) != InvalidIndex())
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SetParent( RightChild(leftchild), elem );
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if (leftchild != InvalidIndex())
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SetParent( leftchild, Parent(elem) );
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if (!IsRoot(elem))
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{
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if (IsRightChild(elem))
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SetRightChild( Parent(elem), leftchild );
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else
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SetLeftChild( Parent(elem), leftchild );
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}
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else
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m_Root = leftchild;
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SetRightChild( leftchild, elem );
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if (elem != InvalidIndex())
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SetParent( elem, leftchild );
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}
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//-----------------------------------------------------------------------------
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// Rebalances the tree after an insertion
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//-----------------------------------------------------------------------------
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template <class T, class I>
|
|
void CUtlRBTree<T, I>::InsertRebalance(I elem)
|
|
{
|
|
while ( !IsRoot(elem) && (Color(Parent(elem)) == RED) )
|
|
{
|
|
I parent = Parent(elem);
|
|
I grandparent = Parent(parent);
|
|
|
|
/* we have a violation */
|
|
if (IsLeftChild(parent))
|
|
{
|
|
I uncle = RightChild(grandparent);
|
|
if (IsRed(uncle))
|
|
{
|
|
/* uncle is RED */
|
|
SetColor(parent, BLACK);
|
|
SetColor(uncle, BLACK);
|
|
SetColor(grandparent, RED);
|
|
elem = grandparent;
|
|
}
|
|
else
|
|
{
|
|
/* uncle is BLACK */
|
|
if (IsRightChild(elem))
|
|
{
|
|
/* make x a left child, will change parent and grandparent */
|
|
elem = parent;
|
|
RotateLeft(elem);
|
|
parent = Parent(elem);
|
|
grandparent = Parent(parent);
|
|
}
|
|
/* recolor and rotate */
|
|
SetColor(parent, BLACK);
|
|
SetColor(grandparent, RED);
|
|
RotateRight(grandparent);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* mirror image of above code */
|
|
I uncle = LeftChild(grandparent);
|
|
if (IsRed(uncle))
|
|
{
|
|
/* uncle is RED */
|
|
SetColor(parent, BLACK);
|
|
SetColor(uncle, BLACK);
|
|
SetColor(grandparent, RED);
|
|
elem = grandparent;
|
|
}
|
|
else
|
|
{
|
|
/* uncle is BLACK */
|
|
if (IsLeftChild(elem))
|
|
{
|
|
/* make x a right child, will change parent and grandparent */
|
|
elem = parent;
|
|
RotateRight(parent);
|
|
parent = Parent(elem);
|
|
grandparent = Parent(parent);
|
|
}
|
|
/* recolor and rotate */
|
|
SetColor(parent, BLACK);
|
|
SetColor(grandparent, RED);
|
|
RotateLeft(grandparent);
|
|
}
|
|
}
|
|
}
|
|
SetColor( m_Root, BLACK );
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Insert a node into the tree
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::InsertAt( I parent, bool leftchild )
|
|
{
|
|
I i = NewNode();
|
|
LinkToParent( i, parent, leftchild );
|
|
++m_NumElements;
|
|
return i;
|
|
}
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::LinkToParent( I i, I parent, bool isLeft )
|
|
{
|
|
Links_t &elem = Links(i);
|
|
elem.m_Parent = parent;
|
|
elem.m_Left = elem.m_Right = InvalidIndex();
|
|
elem.m_Tag = RED;
|
|
|
|
/* insert node in tree */
|
|
if (parent != InvalidIndex())
|
|
{
|
|
if (isLeft)
|
|
Links(parent).m_Left = i;
|
|
else
|
|
Links(parent).m_Right = i;
|
|
}
|
|
else
|
|
{
|
|
m_Root = i;
|
|
}
|
|
|
|
InsertRebalance(i);
|
|
|
|
Assert(IsValid());
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Rebalance the tree after a deletion
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::RemoveRebalance(I elem)
|
|
{
|
|
while (elem != m_Root && IsBlack(elem))
|
|
{
|
|
I parent = Parent(elem);
|
|
|
|
// If elem is the left child of the parent
|
|
if (elem == LeftChild(parent))
|
|
{
|
|
// Get our sibling
|
|
I sibling = RightChild(parent);
|
|
if (IsRed(sibling))
|
|
{
|
|
SetColor(sibling, BLACK);
|
|
SetColor(parent, RED);
|
|
RotateLeft(parent);
|
|
|
|
// We may have a new parent now
|
|
parent = Parent(elem);
|
|
sibling = RightChild(parent);
|
|
}
|
|
if ( (IsBlack(LeftChild(sibling))) && (IsBlack(RightChild(sibling))) )
|
|
{
|
|
if (sibling != InvalidIndex())
|
|
SetColor(sibling, RED);
|
|
elem = parent;
|
|
}
|
|
else
|
|
{
|
|
if (IsBlack(RightChild(sibling)))
|
|
{
|
|
SetColor(LeftChild(sibling), BLACK);
|
|
SetColor(sibling, RED);
|
|
RotateRight(sibling);
|
|
|
|
// rotation may have changed this
|
|
parent = Parent(elem);
|
|
sibling = RightChild(parent);
|
|
}
|
|
SetColor( sibling, Color(parent) );
|
|
SetColor( parent, BLACK );
|
|
SetColor( RightChild(sibling), BLACK );
|
|
RotateLeft( parent );
|
|
elem = m_Root;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Elem is the right child of the parent
|
|
I sibling = LeftChild(parent);
|
|
if (IsRed(sibling))
|
|
{
|
|
SetColor(sibling, BLACK);
|
|
SetColor(parent, RED);
|
|
RotateRight(parent);
|
|
|
|
// We may have a new parent now
|
|
parent = Parent(elem);
|
|
sibling = LeftChild(parent);
|
|
}
|
|
if ( (IsBlack(RightChild(sibling))) && (IsBlack(LeftChild(sibling))) )
|
|
{
|
|
if (sibling != InvalidIndex())
|
|
SetColor( sibling, RED );
|
|
elem = parent;
|
|
}
|
|
else
|
|
{
|
|
if (IsBlack(LeftChild(sibling)))
|
|
{
|
|
SetColor( RightChild(sibling), BLACK );
|
|
SetColor( sibling, RED );
|
|
RotateLeft( sibling );
|
|
|
|
// rotation may have changed this
|
|
parent = Parent(elem);
|
|
sibling = LeftChild(parent);
|
|
}
|
|
SetColor( sibling, Color(parent) );
|
|
SetColor( parent, BLACK );
|
|
SetColor( LeftChild(sibling), BLACK );
|
|
RotateRight( parent );
|
|
elem = m_Root;
|
|
}
|
|
}
|
|
}
|
|
SetColor( elem, BLACK );
|
|
}
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::Unlink( I elem )
|
|
{
|
|
if ( elem != InvalidIndex() )
|
|
{
|
|
I x, y;
|
|
|
|
if ((LeftChild(elem) == InvalidIndex()) ||
|
|
(RightChild(elem) == InvalidIndex()))
|
|
{
|
|
/* y has a NIL node as a child */
|
|
y = elem;
|
|
}
|
|
else
|
|
{
|
|
/* find tree successor with a NIL node as a child */
|
|
y = RightChild(elem);
|
|
while (LeftChild(y) != InvalidIndex())
|
|
y = LeftChild(y);
|
|
}
|
|
|
|
/* x is y's only child */
|
|
if (LeftChild(y) != InvalidIndex())
|
|
x = LeftChild(y);
|
|
else
|
|
x = RightChild(y);
|
|
|
|
/* remove y from the parent chain */
|
|
if (x != InvalidIndex())
|
|
SetParent( x, Parent(y) );
|
|
if (!IsRoot(y))
|
|
{
|
|
if (IsLeftChild(y))
|
|
SetLeftChild( Parent(y), x );
|
|
else
|
|
SetRightChild( Parent(y), x );
|
|
}
|
|
else
|
|
m_Root = x;
|
|
|
|
// need to store this off now, we'll be resetting y's color
|
|
NodeColor_t ycolor = Color(y);
|
|
if (y != elem)
|
|
{
|
|
// Standard implementations copy the data around, we cannot here.
|
|
// Hook in y to link to the same stuff elem used to.
|
|
SetParent( y, Parent(elem) );
|
|
SetRightChild( y, RightChild(elem) );
|
|
SetLeftChild( y, LeftChild(elem) );
|
|
|
|
if (!IsRoot(elem))
|
|
if (IsLeftChild(elem))
|
|
SetLeftChild( Parent(elem), y );
|
|
else
|
|
SetRightChild( Parent(elem), y );
|
|
else
|
|
m_Root = y;
|
|
|
|
if (LeftChild(y) != InvalidIndex())
|
|
SetParent( LeftChild(y), y );
|
|
if (RightChild(y) != InvalidIndex())
|
|
SetParent( RightChild(y), y );
|
|
|
|
SetColor( y, Color(elem) );
|
|
}
|
|
|
|
if ((x != InvalidIndex()) && (ycolor == BLACK))
|
|
RemoveRebalance(x);
|
|
}
|
|
}
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::Link( I elem )
|
|
{
|
|
if ( elem != InvalidIndex() )
|
|
{
|
|
I parent;
|
|
bool leftchild;
|
|
|
|
FindInsertionPosition( Element( elem ), parent, leftchild );
|
|
|
|
LinkToParent( elem, parent, leftchild );
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Delete a node from the tree
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::RemoveAt(I elem)
|
|
{
|
|
if ( elem != InvalidIndex() )
|
|
{
|
|
Unlink( elem );
|
|
|
|
FreeNode(elem);
|
|
--m_NumElements;
|
|
}
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// remove a node in the tree
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I> bool CUtlRBTree<T, I>::Remove( T const &search )
|
|
{
|
|
I node = Find( search );
|
|
if (node != InvalidIndex())
|
|
{
|
|
RemoveAt(node);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Removes all nodes from the tree
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::RemoveAll()
|
|
{
|
|
// Just iterate through the whole list and add to free list
|
|
// much faster than doing all of the rebalancing
|
|
// also, do it so the free list is pointing to stuff in order
|
|
// to get better cache coherence when re-adding stuff to this tree.
|
|
I prev = InvalidIndex();
|
|
for (int i = (int)m_TotalElements; --i >= 0; )
|
|
{
|
|
I idx = (I)i;
|
|
if (IsValidIndex(idx))
|
|
Destruct( &Element(idx) );
|
|
SetRightChild( idx, prev );
|
|
SetLeftChild( idx, idx );
|
|
prev = idx;
|
|
}
|
|
m_FirstFree = m_TotalElements ? (I)0 : InvalidIndex();
|
|
m_Root = InvalidIndex();
|
|
m_NumElements = 0;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// iteration
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::FirstInorder() const
|
|
{
|
|
I i = m_Root;
|
|
while (LeftChild(i) != InvalidIndex())
|
|
i = LeftChild(i);
|
|
return i;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::NextInorder( I i ) const
|
|
{
|
|
Assert(IsValidIndex(i));
|
|
|
|
if (RightChild(i) != InvalidIndex())
|
|
{
|
|
i = RightChild(i);
|
|
while (LeftChild(i) != InvalidIndex())
|
|
i = LeftChild(i);
|
|
return i;
|
|
}
|
|
|
|
I parent = Parent(i);
|
|
while (IsRightChild(i))
|
|
{
|
|
i = parent;
|
|
if (i == InvalidIndex()) break;
|
|
parent = Parent(i);
|
|
}
|
|
return parent;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::PrevInorder( I i ) const
|
|
{
|
|
Assert(IsValidIndex(i));
|
|
|
|
if (LeftChild(i) != InvalidIndex())
|
|
{
|
|
i = LeftChild(i);
|
|
while (RightChild(i) != InvalidIndex())
|
|
i = RightChild(i);
|
|
return i;
|
|
}
|
|
|
|
I parent = Parent(i);
|
|
while (IsLeftChild(i))
|
|
{
|
|
i = parent;
|
|
if (i == InvalidIndex()) break;
|
|
parent = Parent(i);
|
|
}
|
|
return parent;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::LastInorder() const
|
|
{
|
|
I i = m_Root;
|
|
while (RightChild(i) != InvalidIndex())
|
|
i = RightChild(i);
|
|
return i;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::FirstPreorder() const
|
|
{
|
|
return m_Root;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::NextPreorder( I i ) const
|
|
{
|
|
if (LeftChild(i) != InvalidIndex())
|
|
return LeftChild(i);
|
|
|
|
if (RightChild(i) != InvalidIndex())
|
|
return RightChild(i);
|
|
|
|
I parent = Parent(i);
|
|
while( parent != InvalidIndex())
|
|
{
|
|
if (IsLeftChild(i) && (RightChild(parent) != InvalidIndex()))
|
|
return RightChild(parent);
|
|
i = parent;
|
|
parent = Parent(parent);
|
|
}
|
|
return InvalidIndex();
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::PrevPreorder( I i ) const
|
|
{
|
|
Assert(0); // not implemented yet
|
|
return InvalidIndex();
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::LastPreorder() const
|
|
{
|
|
I i = m_Root;
|
|
while (1)
|
|
{
|
|
while (RightChild(i) != InvalidIndex())
|
|
i = RightChild(i);
|
|
|
|
if (LeftChild(i) != InvalidIndex())
|
|
i = LeftChild(i);
|
|
else
|
|
break;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::FirstPostorder() const
|
|
{
|
|
I i = m_Root;
|
|
while (!IsLeaf(i))
|
|
{
|
|
if (LeftChild(i))
|
|
i = LeftChild(i);
|
|
else
|
|
i = RightChild(i);
|
|
}
|
|
return i;
|
|
}
|
|
|
|
template <class T, class I>
|
|
I CUtlRBTree<T, I>::NextPostorder( I i ) const
|
|
{
|
|
I parent = Parent(i);
|
|
if (parent == InvalidIndex())
|
|
return InvalidIndex();
|
|
|
|
if (IsRightChild(i))
|
|
return parent;
|
|
|
|
if (RightChild(parent) == InvalidIndex())
|
|
return parent;
|
|
|
|
i = RightChild(parent);
|
|
while (!IsLeaf(i))
|
|
{
|
|
if (LeftChild(i))
|
|
i = LeftChild(i);
|
|
else
|
|
i = RightChild(i);
|
|
}
|
|
return i;
|
|
}
|
|
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::Reinsert( I elem )
|
|
{
|
|
Unlink( elem );
|
|
Link( elem );
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// returns the tree depth (not a very fast operation)
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
int CUtlRBTree<T, I>::Depth( I node ) const
|
|
{
|
|
if (node == InvalidIndex())
|
|
return 0;
|
|
|
|
int depthright = Depth( RightChild(node) );
|
|
int depthleft = Depth( LeftChild(node) );
|
|
return max(depthright, depthleft) + 1;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Makes sure the tree is valid after every operation
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
bool CUtlRBTree<T, I>::IsValid() const
|
|
{
|
|
if ( !Count() )
|
|
return true;
|
|
|
|
if (( Root() >= MaxElement()) || ( Parent( Root() ) != InvalidIndex() ))
|
|
goto InvalidTree;
|
|
|
|
#ifdef UTLTREE_PARANOID
|
|
|
|
// First check to see that mNumEntries matches reality.
|
|
// count items on the free list
|
|
int numFree = 0;
|
|
int curr = m_FirstFree;
|
|
while (curr != InvalidIndex())
|
|
{
|
|
++numFree;
|
|
curr = RightChild(curr);
|
|
if ( (curr > MaxElement()) && (curr != InvalidIndex()) )
|
|
goto InvalidTree;
|
|
}
|
|
if (MaxElement() - numFree != Count())
|
|
goto InvalidTree;
|
|
|
|
// iterate over all elements, looking for validity
|
|
// based on the self pointers
|
|
int numFree2 = 0;
|
|
for (curr = 0; curr < MaxElement(); ++curr)
|
|
{
|
|
if (!IsValidIndex(curr))
|
|
++numFree2;
|
|
else
|
|
{
|
|
int right = RightChild(curr);
|
|
int left = LeftChild(curr);
|
|
if ((right == left) && (right != InvalidIndex()) )
|
|
goto InvalidTree;
|
|
|
|
if (right != InvalidIndex())
|
|
{
|
|
if (!IsValidIndex(right))
|
|
goto InvalidTree;
|
|
if (Parent(right) != curr)
|
|
goto InvalidTree;
|
|
if (IsRed(curr) && IsRed(right))
|
|
goto InvalidTree;
|
|
}
|
|
|
|
if (left != InvalidIndex())
|
|
{
|
|
if (!IsValidIndex(left))
|
|
goto InvalidTree;
|
|
if (Parent(left) != curr)
|
|
goto InvalidTree;
|
|
if (IsRed(curr) && IsRed(left))
|
|
goto InvalidTree;
|
|
}
|
|
}
|
|
}
|
|
if (numFree2 != numFree)
|
|
goto InvalidTree;
|
|
|
|
#endif // UTLTREE_PARANOID
|
|
|
|
return true;
|
|
|
|
InvalidTree:
|
|
return false;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Sets the less func
|
|
//-----------------------------------------------------------------------------
|
|
|
|
template <class T, class I>
|
|
void CUtlRBTree<T, I>::SetLessFunc( typename CUtlRBTree<T, I>::LessFunc_t func )
|
|
{
|
|
if (!m_LessFunc)
|
|
m_LessFunc = func;
|
|
else
|
|
{
|
|
// need to re-sort the tree here....
|
|
Assert(0);
|
|
}
|
|
}
|
|
|
|
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//-----------------------------------------------------------------------------
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// inserts a node into the tree
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//-----------------------------------------------------------------------------
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// Inserts a node into the tree, doesn't copy the data in.
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template <class T, class I>
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void CUtlRBTree<T, I>::FindInsertionPosition( T const &insert, I &parent, bool &leftchild )
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{
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Assert( m_LessFunc );
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/* find where node belongs */
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I current = m_Root;
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parent = InvalidIndex();
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leftchild = false;
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while (current != InvalidIndex())
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{
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parent = current;
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if (m_LessFunc( insert, Element(current) ))
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{
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leftchild = true; current = LeftChild(current);
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}
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else
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{
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leftchild = false; current = RightChild(current);
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}
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}
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}
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template <class T, class I>
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I CUtlRBTree<T, I>::Insert( T const &insert )
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{
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// use copy constructor to copy it in
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I parent;
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bool leftchild;
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FindInsertionPosition( insert, parent, leftchild );
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I newNode = InsertAt( parent, leftchild );
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CopyConstruct( &Element( newNode ), insert );
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return newNode;
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}
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template <class T, class I>
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void CUtlRBTree<T, I>::Insert( const T *pArray, int nItems )
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|
{
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|
while ( nItems-- )
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{
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|
Insert( *pArray++ );
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}
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}
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//-----------------------------------------------------------------------------
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// finds a node in the tree
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//-----------------------------------------------------------------------------
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|
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template <class T, class I>
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I CUtlRBTree<T, I>::Find( T const &search ) const
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|
{
|
|
Assert( m_LessFunc );
|
|
|
|
I current = m_Root;
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|
while (current != InvalidIndex())
|
|
{
|
|
if (m_LessFunc( search, Element(current) ))
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|
current = LeftChild(current);
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|
else if (m_LessFunc( Element(current), search ))
|
|
current = RightChild(current);
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|
else
|
|
break;
|
|
}
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|
return current;
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|
}
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#endif // UTLRBTREE_H
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