Changeset 3985 for branches/f4grobner/priority-queue.lisp

Timestamp:

2016-05-30T20:50:14-07:00 (8 years ago)

Author:

Marek Rychlik

Message:

* empty log message *

File:

• branches/f4grobner/priority-queue.lisp (modified) (3 diffs)

branches/f4grobner/priority-queue.lisp

@@ -28 +28 @@
 (defpackage "PRIORITY-QUEUE"
   (:use :cl :heap)
-  (:export "*PRIORITY-QUEUE-ALLOCATION-SIZE*"
-           "PRIORITY-QUEUE"
-           "PRIORITY-QUEUE-HEAP"
-           "PRIORITY-QUEUE-TEST"
+  (:export "PRIORITY-QUEUE"
            "MAKE-PRIORITY-QUEUE"
            "PRIORITY-QUEUE-INSERT"
@@ -40 +37 @@
 
 (in-package :priority-queue)
-(defparameter *priority-queue-allocation-size* 16)
-
-(defun priority-queue-make-heap (&key (element-type 'fixnum))
-  (make-array *priority-queue-allocation-size* :element-type element-type :fill-pointer 1
-              :adjustable t))
 
 (defstruct (priority-queue (:constructor priority-queue-construct))
-  (heap (priority-queue-make-heap))
+  (heap (make-heap))
   test)
 
@@ -54 +46 @@
                             (element-key #'identity))
   (priority-queue-construct
-   :heap (priority-queue-make-heap :element-type element-type)
+   :heap (make-heap :element-type element-type)
    :test #'(lambda (x y) (funcall test (funcall element-key y) (funcall element-key x)))))
   
 (defun priority-queue-insert (pq item)
-  (priority-queue-heap-insert (priority-queue-heap pq) item (priority-queue-test pq)))
+  (heap-insert (priority-queue-heap pq) item (priority-queue-test pq)))
 
 (defun priority-queue-remove (pq)
-  (priority-queue-heap-remove (priority-queue-heap pq) (priority-queue-test pq)))
+  (heap-remove (priority-queue-heap pq) (priority-queue-test pq)))
 
 (defun priority-queue-empty-p (pq)
-  (priority-queue-heap-empty-p (priority-queue-heap pq)))
+  (heap-empty-p (priority-queue-heap pq)))
 
 (defun priority-queue-size (pq)
   (fill-pointer (priority-queue-heap pq)))
-
-(defun priority-queue-upheap (a k
-               &optional
-               (test #'<=)
-               &aux  (v (aref a k)))
-  (declare (fixnum k))
-  (assert (< 0 k (fill-pointer a)))
-  (loop
-   (let ((parent (ash k -1)))
-     (when (zerop parent) (return))
-     (unless (funcall test (aref a parent) v)
-       (return))
-     (setf (aref a k) (aref a parent)
-           k parent)))
-  (setf (aref a k) v)
-  a)
-
-    
-(defun priority-queue-heap-insert (a item &optional (test #'<=))
-  (vector-push-extend item a)
-  (priority-queue-upheap a (1- (fill-pointer a)) test))
-
-(defun priority-queue-downheap (a k
-                 &optional
-                 (test #'<=)
-                 &aux  (v (aref a k)) (j 0) (n (fill-pointer a)))
-  (declare (fixnum k n j))
-  (loop
-   (unless (<= k (ash n -1))
-     (return))
-   (setf j (ash k 1))
-   (if (and (< j n) (not (funcall test (aref a (1+ j)) (aref a j))))
-       (incf j))
-   (when (funcall test (aref a j) v)
-     (return))
-   (setf (aref a k) (aref a j)
-         k j))
-  (setf (aref a k) v)
-  a)
-
-(defun priority-queue-heap-remove (a &optional (test #'<=) &aux (v (aref a 1)))
-  (when (<= (fill-pointer a) 1) (error "Empty queue."))
-  (setf (aref a 1) (vector-pop a))
-  (priority-queue-downheap a 1 test)
-  (values v a))
-
-(defun priority-queue-heap-empty-p (a)
-  (<= (fill-pointer a) 1))