QGIS API Documentation  3.21.0-Master (5b68dc587e)
priorityqueue.h
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1 /*
2  * libpal - Automated Placement of Labels Library
3  *
4  * Copyright (C) 2008 Maxence Laurent, MIS-TIC, HEIG-VD
5  * University of Applied Sciences, Western Switzerland
6  * http://www.hes-so.ch
7  *
8  * Contact:
9  * maxence.laurent <at> heig-vd <dot> ch
10  * or
11  * eric.taillard <at> heig-vd <dot> ch
12  *
13  * This file is part of libpal.
14  *
15  * libpal is free software: you can redistribute it and/or modify
16  * it under the terms of the GNU General Public License as published by
17  * the Free Software Foundation, either version 3 of the License, or
18  * (at your option) any later version.
19  *
20  * libpal is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23  * GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with libpal. If not, see <http://www.gnu.org/licenses/>.
27  *
28  */
29 
30 #ifndef PAL_PRIORITYQUEUE_H
31 #define PAL_PRIORITYQUEUE_H
32 
33 #define SIP_NO_FILE
34 
35 
36 #include <iostream>
37 
38 #define LEFT(x) (2*x+1)
39 #define RIGHT(x) (2*x+2)
40 #define PARENT(x) ((x-1)/2)
41 
42 
43 namespace pal
44 {
45 
53  {
54 
55  public:
56 
63  PriorityQueue( int n, int maxId, bool min );
65 
67  PriorityQueue( const PriorityQueue & ) = delete;
69  PriorityQueue &operator=( const PriorityQueue & ) = delete;
70 
71  void print();
72 
73  int getSize();
74  int getSizeByPos();
75 
76  bool isIn( int key );
77 
78  int getBest(); // O(log n)
79 
80  void remove( int key );
81  void insert( int key, double p );
82 
83  void sort(); // O(n log n)
84 
85  void downheap( int id );
86  void upheap( int key );
87 
88  void decreaseKey( int key );
89  void setPriority( int key, double new_p );
90 
91 
92  int getId( int key );
93  private:
94 
95  int size;
96  int maxsize;
97  int maxId;
98  int *heap = nullptr;
99  double *p = nullptr;
100  int *pos = nullptr;
101 
102  bool ( *greater )( double l, double r );
103  };
104 
105 } // namespace
106 
107 #endif
Custom priority queue for use in pal labeling engine.
Definition: priorityqueue.h:53
PriorityQueue(const PriorityQueue &)=delete
PriorityQueue cannot be copied.
PriorityQueue(int n, int maxId, bool min)
Create a priority queue of max size n \param n max size of the queuet \param p external vector repres...
void decreaseKey(int key)
void setPriority(int key, double new_p)
void downheap(int id)
void insert(int key, double p)
PriorityQueue & operator=(const PriorityQueue &)=delete
PriorityQueue cannot be copied.
void remove(int key)
bool isIn(int key)
void upheap(int key)