ReactOS 0.4.16-dev-321-g63bb46a
priorityq.h
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1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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29 */
30/*
31** Author: Eric Veach, July 1994.
32**
33*/
34
35#ifndef __priorityq_sort_h_
36#define __priorityq_sort_h_
37
38#include "priorityq-heap.h"
39
40#undef PQkey
41#undef PQhandle
42#undef PriorityQ
43#undef pqNewPriorityQ
44#undef pqDeletePriorityQ
45#undef pqInit
46#undef pqInsert
47#undef pqMinimum
48#undef pqExtractMin
49#undef pqDelete
50#undef pqIsEmpty
51
52/* Use #define's so that another heap implementation can use this one */
53
54#define PQkey PQSortKey
55#define PQhandle PQSortHandle
56#define PriorityQ PriorityQSort
57
58#define pqNewPriorityQ(leq) __gl_pqSortNewPriorityQ(leq)
59#define pqDeletePriorityQ(pq) __gl_pqSortDeletePriorityQ(pq)
60
61/* The basic operations are insertion of a new key (pqInsert),
62 * and examination/extraction of a key whose value is minimum
63 * (pqMinimum/pqExtractMin). Deletion is also allowed (pqDelete);
64 * for this purpose pqInsert returns a "handle" which is supplied
65 * as the argument.
66 *
67 * An initial heap may be created efficiently by calling pqInsert
68 * repeatedly, then calling pqInit. In any case pqInit must be called
69 * before any operations other than pqInsert are used.
70 *
71 * If the heap is empty, pqMinimum/pqExtractMin will return a NULL key.
72 * This may also be tested with pqIsEmpty.
73 */
74#define pqInit(pq) __gl_pqSortInit(pq)
75#define pqInsert(pq,key) __gl_pqSortInsert(pq,key)
76#define pqMinimum(pq) __gl_pqSortMinimum(pq)
77#define pqExtractMin(pq) __gl_pqSortExtractMin(pq)
78#define pqDelete(pq,handle) __gl_pqSortDelete(pq,handle)
79#define pqIsEmpty(pq) __gl_pqSortIsEmpty(pq)
80
81
82/* Since we support deletion the data structure is a little more
83 * complicated than an ordinary heap. "nodes" is the heap itself;
84 * active nodes are stored in the range 1..pq->size. When the
85 * heap exceeds its allocated size (pq->max), its size doubles.
86 * The children of node i are nodes 2i and 2i+1.
87 *
88 * Each node stores an index into an array "handles". Each handle
89 * stores a key, plus a pointer back to the node which currently
90 * represents that key (ie. nodes[handles[i].node].handle == i).
91 */
92
93typedef PQHeapKey PQkey;
94typedef PQHeapHandle PQhandle;
95typedef struct PriorityQ PriorityQ;
96
97struct PriorityQ {
98 PriorityQHeap *heap;
99 PQkey *keys;
100 PQkey **order;
102 int initialized;
103 int (*leq)(PQkey key1, PQkey key2);
104};
105
106PriorityQ *pqNewPriorityQ( int (*leq)(PQkey key1, PQkey key2) );
107void pqDeletePriorityQ( PriorityQ *pq );
108
109int pqInit( PriorityQ *pq );
112void pqDelete( PriorityQ *pq, PQhandle handle );
113
115int pqIsEmpty( PriorityQ *pq );
116
117#endif
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31
GLsizeiptr size
Definition: glext.h:5919
GLuint64EXT GLuint GLuint GLenum GLenum GLuint GLuint GLenum GLuint GLuint key1
Definition: glext.h:10608
GLuint GLdouble GLdouble GLint GLint order
Definition: glext.h:11194
long PQhandle
#define pqIsEmpty(pq)
Definition: priorityq.h:79
#define pqNewPriorityQ(leq)
Definition: priorityq.h:58
#define pqDeletePriorityQ(pq)
Definition: priorityq.h:59
#define pqInit(pq)
Definition: priorityq.h:74
#define pqDelete(pq, handle)
Definition: priorityq.h:78
#define pqExtractMin(pq)
Definition: priorityq.h:77
#define PQhandle
Definition: priorityq.h:55
#define pqMinimum(pq)
Definition: priorityq.h:76
#define PQkey
Definition: priorityq.h:54
#define pqInsert(pq, key)
Definition: priorityq.h:75
static HANDLE heap
Definition: heap.c:65
Definition: copy.c:22
#define max(a, b)
Definition: svc.c:63
static BOOL initialized
Definition: syslog.c:39