The PriorityQueue class

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Introduction

A PriorityQueue is very similar to a Queue. Values are pushed into the queue with an assigned priority, and the value with the highest priority will always be at the front of the queue.

Implemented using a max heap.

Note:
"First in, first out" ordering is preserved for values with the same priority.

Note:
Iterating over a PriorityQueue is destructive, equivalent to successive pop operations until the queue is empty.

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Class synopsis

Ds\PriorityQueue implements Ds\Collection {

/* Constants */

const int MIN_CAPACITY = 8 ;

/* Methods */

public allocate ( int $capacity ) : void

public capacity ( void ) : int

public clear ( void ) : void

public copy ( void ) : Ds\PriorityQueue

public isEmpty ( void ) : bool

public peek ( void ) : mixed

public pop ( void ) : mixed

public push ( mixed $value , int $priority ) : void

public toArray ( void ) : array

}

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Predefined Constants

Ds\PriorityQueue::MIN_CAPACITY

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Ds\PriorityQueue::allocate — Allocates enough memory for a required capacity
Ds\PriorityQueue::capacity — Returns the current capacity
Ds\PriorityQueue::clear — Removes all values
Ds\PriorityQueue::__construct — Creates a new instance
Ds\PriorityQueue::copy — Returns a shallow copy of the queue
Ds\PriorityQueue::count — Returns the number of values in the queue
Ds\PriorityQueue::isEmpty — Returns whether the queue is empty
Ds\PriorityQueue::jsonSerialize — Returns a representation that can be converted to JSON
Ds\PriorityQueue::peek — Returns the value at the front of the queue
Ds\PriorityQueue::pop — Removes and returns the value with the highest priority
Ds\PriorityQueue::push — Pushes values into the queue
Ds\PriorityQueue::toArray — Converts the queue to an array

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-class.ds-priorityqueue.html

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References

Manuel PHP : http://php.net

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Contents Haut

The PriorityQueue class

Introduction

Class synopsis

Predefined Constants

Table of Contents

References