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source: branches/f4grobner/priority-queue.lisp@ 4092

Last change on this file since 4092 was 4004, checked in by Marek Rychlik, 9 years ago

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[1201]1;;; -*- Mode: Lisp -*-
[83]2;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3;;;
4;;; Copyright (C) 1999, 2002, 2009, 2015 Marek Rychlik <rychlik@u.arizona.edu>
5;;;
6;;; This program is free software; you can redistribute it and/or modify
7;;; it under the terms of the GNU General Public License as published by
8;;; the Free Software Foundation; either version 2 of the License, or
9;;; (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19;;;
20;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
21
[446]22(defpackage "PRIORITY-QUEUE"
[3984]23 (:use :cl :heap)
[3985]24 (:export "PRIORITY-QUEUE"
[3993]25 "ENQUEUE"
26 "DEQUEUE"
27 "QUEUE-EMPTY-P"
28 "QUEUE-SIZE"
[3991]29 )
30 (:documentation "Implements a priority queue."))
[83]31
[447]32(in-package :priority-queue)
[50]33
[3989]34(defclass priority-queue ()
[4000]35 ((heap :initarg :heap :reader priority-queue-heap)
36 (test :initarg :test :reader priority-queue-test))
[4004]37 (:documentation "Representa a priority queue based on heaps.
38Slots HEAP and TEST are read-only after they are initialized."))
[50]39
[3997]40(defmethod initialize-instance :after ((self priority-queue)
[3989]41 &key
42 (element-type 'fixnum)
43 (test #'<=)
44 (element-key #'identity))
[4001]45 (with-slots (heap (test-x test))
[3989]46 self
47 (setf heap (make-heap :element-type element-type)
[3997]48 test-x #'(lambda (x y) (funcall test (funcall element-key y) (funcall element-key x))))))
[50]49
[3989]50(defgeneric enqueue (self item)
51 (:method ((self priority-queue) (item t))
52 (with-slots (heap test)
53 self
[3999]54 (heap-insert heap item test))
55 self))
[50]56
[3990]57(defgeneric dequeue (self)
58 (:method ((self priority-queue))
59 (with-slots (heap test)
60 self
61 (heap-remove heap test))))
[50]62
[3990]63(defgeneric queue-empty-p (self)
64 (:method ((self priority-queue))
65 (with-slots (heap)
66 self
67 (heap-empty-p heap))))
[50]68
[3992]69(defgeneric queue-size (self)
70 (:method ((self priority-queue))
71 (with-slots (heap)
72 self
73 (heap-size heap))))
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