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fixed bugs in data/heap

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This commit is contained in:
Ryan Culpepper 2010-09-10 20:30:15 -06:00
parent 29597e5937
commit 2a1de28095
1 changed files with 6 additions and 5 deletions
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11
collects/data/heap.rkt
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@ -1,10 +1,11 @@
#lang racket/base
(require racket/vector
(require racket/contract
racket/vector
racket/match)
(define MIN-SIZE 4)
(define-struct heap (vec size <=?) #:mutable)
(define-struct heap (vec count <=?) #:mutable)
;; length(vec)/4 <= size <= length(vec)
;; size = next available index
@ -111,7 +112,7 @@
(vector-copy! vec size keys 0)
(for ([n (in-range size new-size)])
(heapify-up <=? vec n))
(set-heap-size! h new-size))])))
(set-heap-count! h new-size))])))
(define (heap-min h)
(match h
@ -141,7 +142,7 @@
(heapify-down <=? vec index (sub1 size))
(when (< MIN-SIZE size (quotient (vector-length vec) 4))
(set-heap-vec! h (shrink-vector vec)))
(set-heap-size! h (sub1 size))]))
(set-heap-count! h (sub1 size))]))
(define (in-heap h)
(in-heap/consume! (heap-copy h)))
@ -158,7 +159,7 @@
(provide/contract
[make-heap (-> (-> any/c any/c any/c) heap?)]
[heap? (-> any/c boolean?)]
[heap-size (-> heap? exact-nonnegative-integer?)]
[heap-count (-> heap? exact-nonnegative-integer?)]
[heap-copy (-> heap? heap?)]
[vector->heap (-> (-> any/c any/c any/c) vector? heap?)]
[heap-add! (->* (heap?) () #:rest list? void?)]