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60 lines
2.1 KiB
60 lines
2.1 KiB
19 years ago
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/* $Id$ */
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#ifndef YASM_INTTREE_H
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#define YASM_INTTREE_H
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/* The interval_tree.h and interval_tree.cc files contain code for
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* interval trees implemented using red-black-trees as described in
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* the book _Introduction_To_Algorithms_ by Cormen, Leisserson,
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* and Rivest.
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*/
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typedef struct IntervalTreeNode {
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struct IntervalTreeNode *left, *right, *parent;
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void *data;
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long low;
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long high;
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long maxHigh;
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int red; /* if red=0 then the node is black */
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} IntervalTreeNode;
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typedef struct it_recursion_node {
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/* This structure stores the information needed when we take the
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* right branch in searching for intervals but possibly come back
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* and check the left branch as well.
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*/
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IntervalTreeNode *start_node;
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unsigned int parentIndex;
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int tryRightBranch;
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} it_recursion_node;
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typedef struct IntervalTree {
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/* A sentinel is used for root and for nil. These sentinels are
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* created when ITTreeCreate is called. root->left should always
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* point to the node which is the root of the tree. nil points to a
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* node which should always be black but has aribtrary children and
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* parent and no key or info. The point of using these sentinels is so
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* that the root and nil nodes do not require special cases in the code
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*/
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IntervalTreeNode *root;
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IntervalTreeNode *nil;
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/*private:*/
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unsigned int recursionNodeStackSize;
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it_recursion_node * recursionNodeStack;
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unsigned int currentParent;
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unsigned int recursionNodeStackTop;
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} IntervalTree;
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IntervalTree *IT_create(void);
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void IT_destroy(IntervalTree *);
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void IT_print(const IntervalTree *);
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void *IT_delete_node(IntervalTree *, IntervalTreeNode *, long *low,
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long *high);
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IntervalTreeNode *IT_insert(IntervalTree *, long low, long high, void *data);
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IntervalTreeNode *IT_get_predecessor(const IntervalTree *, IntervalTreeNode *);
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IntervalTreeNode *IT_get_successor(const IntervalTree *, IntervalTreeNode *);
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void IT_enumerate(IntervalTree *, long low, long high, void *cbd,
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void (*callback) (IntervalTreeNode *node, void *cbd));
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#endif
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