Scala Library
scala.collection.mutable

class PriorityQueue
[source: scala/collection/mutable/PriorityQueue.scala]
@serializable

@cloneable

class PriorityQueue[A](implicit view$1 : (A) => Ordered[A])
extends ResizableArray[A] with CloneableCollection
This class implements priority queues using a heap. The elements of the queue have to be ordered in terms of the Ordered[T] class.
Author
Matthias Zenger
Version
1.0, 03/05/2004
Direct Known Subclasses:
PriorityQueueProxy, SynchronizedPriorityQueue
Values and Variables inherited from ResizableArray
array
Method Summary
def + (elem1 : A, elem2 : A, elems : A*) : PriorityQueue[A]
def + (elem : A) : PriorityQueue[A]
def ++ (iter : Iterable[A]) : PriorityQueue[A]
def ++ (iter : Iterator[A]) : PriorityQueue[A]
def ++= (it : Iterator[A]) : Unit
Adds all elements provided by an iterator into the priority queue.
def ++= (iter : Iterable[A]) : Unit
Adds all elements provided by an Iterable object into the priority queue.
def += (elem : A) : Unit
Inserts a single element into the priority queue.
def += (elem1 : A, elem2 : A, elems : A*) : Unit
Add two or more elements to this set.
def clear : Unit
Removes all elements from the queue. After this operation is completed, the queue will be empty.
override def clone : PriorityQueue[A]
This method clones the priority queue.
def dequeue : A
Returns the element with the highest priority in the queue, and removes this element from the queue.
override def elements : Iterator[A]
Returns an iterator which yiels all the elements of the priority queue in descending priority order.
def enqueue (elems : A*) : Unit
Adds all elements to the queue.
override def equals (obj : Any) : Boolean
Checks if two queues are structurally identical.
protected def fixDown (as : Array[AnyRef], m : Int, n : Int) : Unit
protected def fixUp (as : Array[AnyRef], m : Int) : Unit
override def hashCode : Int
The hashCode method always yields an error, since it is not safe to use mutable queues as keys in hash tables.
override def isEmpty : Boolean
Checks if the queue is empty.
def max : A
Returns the element with the highest priority in the queue, or throws an error if there is no element contained in the queue.
def toQueue : Queue[A]
Returns a regular queue containing the same elements.
override def toString : java.lang.String
Returns a textual representation of a queue as a string.
Methods inherited from ResizableArray
initialSize, size0, size0_=, length, apply, reduceToSize, copyToArray, copyToBuffer, ensureSize, swap, copy
Methods inherited from RandomAccessSeq
projection, drop, take, slice, reverse, partition, patch, ++, toStream, safeIs
Methods inherited from Seq
lengthCompare, size, concat, last, lastOption, first, firstOption, headOption, isDefinedAt, lastIndexOf, findIndexOf, indexOf, map, flatMap, filter, slice, takeWhile, dropWhile, contains, subseq, toArray, toSeq, equalsWith, startsWith, startsWith, endsWith, indexOf, containsSlice
Methods inherited from Collection
stringPrefix
Methods inherited from Iterable
foreach, forall, exists, find, foldLeft, foldRight, /:, :\, reduceLeft, reduceRight, sameElements, toList, mkString, mkString, mkString, addString, addString, addString, hasDefiniteSize
Methods inherited from PartialFunction
orElse, andThen
Methods inherited from Function1
compose
Methods inherited from AnyRef
getClass, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Method Details
protected def fixUp(as : Array[AnyRef], m : Int) : Unit
protected def fixDown(as : Array[AnyRef], m : Int, n : Int) : Unit
override def isEmpty : Boolean
Checks if the queue is empty.
Returns
true, iff there is no element in the queue.
def +=(elem : A) : Unit
Inserts a single element into the priority queue.
Parameters
elem - the element to insert
def +(elem : A) : PriorityQueue[A]
def +=(elem1 : A, elem2 : A, elems : A*) : Unit
Add two or more elements to this set.
Parameters
elem1 - the first element.
kv2 - the second element.
kvs - the remaining elements.
def +(elem1 : A, elem2 : A, elems : A*) : PriorityQueue[A]
def ++=(iter : Iterable[A]) : Unit
Adds all elements provided by an Iterable object into the priority queue.
Parameters
iter - an iterable object
def ++=(it : Iterator[A]) : Unit
Adds all elements provided by an iterator into the priority queue.
Parameters
it - an iterator
def ++(iter : Iterable[A]) : PriorityQueue[A]
def ++(iter : Iterator[A]) : PriorityQueue[A]
def enqueue(elems : A*) : Unit
Adds all elements to the queue.
Parameters
elems - the elements to add.
def dequeue : A
Returns the element with the highest priority in the queue, and removes this element from the queue.
Throws
Predef.NoSuchElementException -
Returns
the element with the highest priority.
def max : A
Returns the element with the highest priority in the queue, or throws an error if there is no element contained in the queue.
Returns
the element with the highest priority.
def clear : Unit
Removes all elements from the queue. After this operation is completed, the queue will be empty.
override def elements : Iterator[A]
Returns an iterator which yiels all the elements of the priority queue in descending priority order.
Returns
an iterator over all elements sorted in descending order.
Overrides
ResizableArray.elements
override def equals(obj : Any) : Boolean
Checks if two queues are structurally identical.
Returns
true, iff both queues contain the same sequence of elements.
override def hashCode : Int
The hashCode method always yields an error, since it is not safe to use mutable queues as keys in hash tables.
Returns
never.
def toQueue : Queue[A]
Returns a regular queue containing the same elements.
override def toString : java.lang.String
Returns a textual representation of a queue as a string.
Returns
the string representation of this queue.
override def clone : PriorityQueue[A]
This method clones the priority queue.
Returns
a priority queue with the same elements.
Overrides
CloneableCollection.clone
Scala Library