Class LongArrayPriorityQueue

java.lang.Object
it.unimi.dsi.fastutil.longs.LongArrayPriorityQueue
All Implemented Interfaces:
LongPriorityQueue, PriorityQueue<java.lang.Long>, java.io.Serializable

public class LongArrayPriorityQueue
extends java.lang.Object
implements LongPriorityQueue, java.io.Serializable
A type-specific array-based priority queue.

Instances of this class represent a priority queue using a backing array—all operations are performed directly on the array. The array is enlarged as needed, but it is never shrunk. Use the trim() method to reduce its size, if necessary.

See Also:
Serialized Form
Implementation Specification:
This implementation is extremely inefficient, but it is difficult to beat when the size of the queue is very small.
  • Constructor Details

    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(int capacity, LongComparator c)
      Creates a new empty queue with a given capacity and comparator.
      Parameters:
      capacity - the initial capacity of this queue.
      c - the comparator used in this queue, or null for the natural order.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(int capacity)
      Creates a new empty queue with a given capacity and using the natural order.
      Parameters:
      capacity - the initial capacity of this queue.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(LongComparator c)
      Creates a new empty queue with a given comparator.
      Parameters:
      c - the comparator used in this queue, or null for the natural order.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue()
      Creates a new empty queue using the natural order.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(long[] a, int size, LongComparator c)
      Wraps a given array in a queue using a given comparator.

      The queue returned by this method will be backed by the given array.

      Parameters:
      a - an array.
      size - the number of elements to be included in the queue.
      c - the comparator used in this queue, or null for the natural order.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(long[] a, LongComparator c)
      Wraps a given array in a queue using a given comparator.

      The queue returned by this method will be backed by the given array.

      Parameters:
      a - an array.
      c - the comparator used in this queue, or null for the natural order.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(long[] a, int size)
      Wraps a given array in a queue using the natural order.

      The queue returned by this method will be backed by the given array.

      Parameters:
      a - an array.
      size - the number of elements to be included in the queue.
    • LongArrayPriorityQueue

      public LongArrayPriorityQueue​(long[] a)
      Wraps a given array in a queue using the natural order.

      The queue returned by this method will be backed by the given array.

      Parameters:
      a - an array.
  • Method Details