Class LongHeapPriorityQueue

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

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

Instances of this class represent a priority queue using a heap. The heap is enlarged as needed, but it is never shrunk. Use the trim() method to reduce its size, if necessary.

See Also:
Serialized Form
  • Constructor Details

    • LongHeapPriorityQueue

      public LongHeapPriorityQueue​(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.
    • LongHeapPriorityQueue

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

      public LongHeapPriorityQueue​(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.
    • LongHeapPriorityQueue

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

      public LongHeapPriorityQueue​(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. The first size element of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

      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.
    • LongHeapPriorityQueue

      public LongHeapPriorityQueue​(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. The elements of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

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

      public LongHeapPriorityQueue​(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. The first size element of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

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

      public LongHeapPriorityQueue​(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. The elements of the array will be rearranged so to form a heap (this is more efficient than enqueing the elements of a one by one).

      Parameters:
      a - an array.
    • LongHeapPriorityQueue

      public LongHeapPriorityQueue​(LongCollection collection, LongComparator c)
      Creates a queue using the elements in a type-specific collection using a given comparator.

      This constructor is more efficient than enqueing the elements of collection one by one.

      Parameters:
      collection - a collection; its elements will be used to initialize the queue.
      c - the comparator used in this queue, or null for the natural order.
    • LongHeapPriorityQueue

      public LongHeapPriorityQueue​(LongCollection collection)
      Creates a queue using the elements in a type-specific collection using the natural order.

      This constructor is more efficient than enqueing the elements of collection one by one.

      Parameters:
      collection - a collection; its elements will be used to initialize the queue.
    • LongHeapPriorityQueue

      public LongHeapPriorityQueue​(java.util.Collection<? extends java.lang.Long> collection, LongComparator c)
      Creates a queue using the elements in a collection using a given comparator.

      This constructor is more efficient than enqueing the elements of collection one by one.

      Parameters:
      collection - a collection; its elements will be used to initialize the queue.
      c - the comparator used in this queue, or null for the natural order.
    • LongHeapPriorityQueue

      public LongHeapPriorityQueue​(java.util.Collection<? extends java.lang.Long> collection)
      Creates a queue using the elements in a collection using the natural order.

      This constructor is more efficient than enqueing the elements of collection one by one.

      Parameters:
      collection - a collection; its elements will be used to initialize the queue.
  • Method Details