Class DoubleHeapPriorityQueue

java.lang.Object
it.unimi.dsi.fastutil.doubles.DoubleHeapPriorityQueue
All Implemented Interfaces:
DoublePriorityQueue, PriorityQueue<Double>, Serializable

public class DoubleHeapPriorityQueue extends Object implements DoublePriorityQueue, 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:
  • Constructor Details

    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(int capacity, DoubleComparator 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.
    • DoubleHeapPriorityQueue

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

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

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

      public DoubleHeapPriorityQueue(double[] a, int size, DoubleComparator 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(double[] a, DoubleComparator 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(double[] 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(double[] 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(DoubleCollection collection, DoubleComparator 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(DoubleCollection 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(Collection<? extends Double> collection, DoubleComparator 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.
    • DoubleHeapPriorityQueue

      public DoubleHeapPriorityQueue(Collection<? extends Double> 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