FloatArrayPriorityQueue (fastutil-reference-char-maps 8.3.1 API)

java.lang.Object
- it.unimi.dsi.fastutil.floats.FloatArrayPriorityQueue

All Implemented Interfaces:

FloatPriorityQueue, PriorityQueue<Float>, Serializable
```
public class FloatArrayPriorityQueue
extends Object
implements FloatPriorityQueue, 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.
This implementation is extremely inefficient, but it is difficult to beat when the size of the queue is very small.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`protected float[]`	`array` The backing array.
`protected FloatComparator`	`c` The type-specific comparator used in this queue.
`protected int`	`firstIndex` The first index, cached, if `firstIndexValid` is true.
`protected boolean`	`firstIndexValid` Whether `firstIndex` contains a valid value.
`protected int`	`size` The number of elements in this queue.

Constructor Summary

Constructors
Constructor and Description
`FloatArrayPriorityQueue()` Creates a new empty queue using the natural order.
`FloatArrayPriorityQueue(float[] a)` Wraps a given array in a queue using the natural order.
`FloatArrayPriorityQueue(float[] a, FloatComparator c)` Wraps a given array in a queue using a given comparator.
`FloatArrayPriorityQueue(float[] a, int size)` Wraps a given array in a queue using the natural order.
`FloatArrayPriorityQueue(float[] a, int size, FloatComparator c)` Wraps a given array in a queue using a given comparator.
`FloatArrayPriorityQueue(FloatComparator c)` Creates a new empty queue with a given comparator.
`FloatArrayPriorityQueue(int capacity)` Creates a new empty queue with a given capacity and using the natural order.
`FloatArrayPriorityQueue(int capacity, FloatComparator c)` Creates a new empty queue with a given capacity and comparator.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`changed()` Notifies the queue that the first element has changed (optional operation).
`void`	`clear()` Removes all elements from this queue.
`FloatComparator`	`comparator()` Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
`float`	`dequeueFloat()` Dequeues the first element from the queue.
`void`	`enqueue(float x)` Enqueues a new element.
`float`	`firstFloat()` Returns the first element of the queue.
`int`	`size()` Returns the number of elements in this queue.
`void`	`trim()` Trims the underlying array so that it has exactly `size()` elements.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.floats.FloatPriorityQueue
dequeue, enqueue, first, last, lastFloat

Methods inherited from interface it.unimi.dsi.fastutil.PriorityQueue
isEmpty

- Field Detail
  - array
```
protected transient float[] array
```
    The backing array.
  - size
```
protected int size
```
    The number of elements in this queue.
  - c
```
protected FloatComparator c
```
    The type-specific comparator used in this queue.
  - firstIndex
```
protected transient int firstIndex
```
    The first index, cached, if firstIndexValid is true.
  - firstIndexValid
```
protected transient boolean firstIndexValid
```
    Whether firstIndex contains a valid value.
- Constructor Detail
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(int capacity,
                               FloatComparator 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.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(int capacity)
```
    Creates a new empty queue with a given capacity and using the natural order.
    
    Parameters:
    
    capacity - the initial capacity of this queue.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(FloatComparator c)
```
    Creates a new empty queue with a given comparator.
    
    Parameters:
    
    c - the comparator used in this queue, or null for the natural order.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue()
```
    Creates a new empty queue using the natural order.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(float[] a,
                               int size,
                               FloatComparator 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.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(float[] a,
                               FloatComparator 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.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(float[] 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.
  - FloatArrayPriorityQueue
```
public FloatArrayPriorityQueue(float[] 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 Detail
  - enqueue
```
public void enqueue(float x)
```
    Description copied from interface: FloatPriorityQueue
    
    Enqueues a new element.
    
    Specified by:
    
    enqueue in interface FloatPriorityQueue
    
    Parameters:
    
    x - the element to enqueue.
    
    See Also:
    
    PriorityQueue.enqueue(Object)
  - dequeueFloat
```
public float dequeueFloat()
```
    Description copied from interface: FloatPriorityQueue
    
    Dequeues the first element from the queue.
    
    Specified by:
    
    dequeueFloat in interface FloatPriorityQueue
    
    Returns:
    
    the dequeued element.
    
    See Also:
    
    FloatPriorityQueue.dequeue()
  - firstFloat
```
public float firstFloat()
```
    Description copied from interface: FloatPriorityQueue
    
    Returns the first element of the queue.
    
    Specified by:
    
    firstFloat in interface FloatPriorityQueue
    
    Returns:
    
    the first element.
    
    See Also:
    
    FloatPriorityQueue.first()
  - changed
```
public void changed()
```
    Description copied from interface: PriorityQueue
    
    Notifies the queue that the first element has changed (optional operation).
    This default implementation just throws an UnsupportedOperationException.
    
    Specified by:
    
    changed in interface PriorityQueue<Float>
  - size
```
public int size()
```
    Description copied from interface: PriorityQueue
    
    Returns the number of elements in this queue.
    
    Specified by:
    
    size in interface PriorityQueue<Float>
    
    Returns:
    
    the number of elements in this queue.
  - clear
```
public void clear()
```
    Description copied from interface: PriorityQueue
    
    Removes all elements from this queue.
    
    Specified by:
    
    clear in interface PriorityQueue<Float>
  - trim
```
public void trim()
```
    Trims the underlying array so that it has exactly size() elements.
  - comparator
```
public FloatComparator comparator()
```
    Description copied from interface: FloatPriorityQueue
    
    Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
    Note that this specification strengthens the one given in PriorityQueue.comparator().
    
    Specified by:
    
    comparator in interface FloatPriorityQueue
    
    Specified by:
    
    comparator in interface PriorityQueue<Float>
    
    Returns:
    
    the comparator associated with this priority queue.
    
    See Also:
    
    PriorityQueue.comparator()

Class FloatArrayPriorityQueue

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.floats.FloatPriorityQueue

Methods inherited from interface it.unimi.dsi.fastutil.PriorityQueue

Field Detail

array

size

c

firstIndex

firstIndexValid

Constructor Detail

FloatArrayPriorityQueue

FloatArrayPriorityQueue

FloatArrayPriorityQueue

FloatArrayPriorityQueue

FloatArrayPriorityQueue

FloatArrayPriorityQueue

FloatArrayPriorityQueue

FloatArrayPriorityQueue

Method Detail

enqueue

dequeueFloat

firstFloat

changed

size

clear

trim

comparator